Extracting prog: 26.678008907s
Minimizing prog: 19m34.731878543s
Simplifying prog options: 0s
Extracting C: 47.123202694s
Simplifying C: 6m0.167324828s


extracting reproducer from 82 programs
first checking the prog from the crash report
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-syz_genetlink_get_family_id$tipc2-syz_mount_image$ext4-bpf$PROG_LOAD-quotactl$Q_SETINFO-ioctl$sock_inet_SIOCGIFPFLAGS-sendmsg$TIPC_NL_BEARER_ADD-connect$pppl2tp
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
r6 = socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
r7 = syz_genetlink_get_family_id$tipc2(&(0x7f00000001c0), 0xffffffffffffffff)
syz_mount_image$ext4(&(0x7f00000000c0)='ext4\x00', &(0x7f00000001c0)='./file1\x00', 0x800, &(0x7f0000000880)={[{@nouid32}, {@errors_remount}, {@discard}, {@dioread_lock}, {@resuid}]}, 0x1, 0x503, &(0x7f0000000200)="$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")
bpf$PROG_LOAD(0x5, &(0x7f000000e000)={0xd, 0x4, &(0x7f0000000040)=@framed={{0xffffffb4, 0x0, 0x0, 0x0, 0x0, 0x61, 0x11, 0x3c}, [@ldst={0x6, 0x3}], {0x95, 0x0, 0xc00}}, &(0x7f0000003ff6)='GPL\x00', 0x2, 0xc3, &(0x7f000000cf3d)=""/195, 0x0, 0x0, '\x00', 0x0, @sock_ops, 0xffffffffffffffff, 0x8, &(0x7f0000000000), 0x8, 0x10, &(0x7f0000000000), 0x10, 0x0, 0xffffffffffffffff, 0xfffffffffffffd8b}, 0x3c)
quotactl$Q_SETINFO(0xffffffff80000601, &(0x7f0000000040)=@loop={'/dev/loop', 0x0}, 0x0, &(0x7f0000002780)={0x7d, 0x6, 0x0, 0x4})
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})
sendmsg$TIPC_NL_BEARER_ADD(r6, &(0x7f0000000400)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000440)=ANY=[@ANYBLOB='(\x00\x00\x00', @ANYRES16=r7, @ANYBLOB="991f28bd70400700f77f0d"], 0x28}, 0x1, 0x0, 0x0, 0x24000884}, 0x2400c000)
connect$pppl2tp(r4, &(0x7f0000000100)=@pppol2tpv3={0x18, 0x1, {0x0, r5, {0x2, 0x0, @loopback}, 0x80004, 0x0, 0xffffffff}}, 0x2e)

program crashed: KASAN: use-after-free Read in rcu_cblist_dequeue
single: successfully extracted reproducer
found reproducer with 24 syscalls
minimizing guilty program
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-syz_genetlink_get_family_id$tipc2-syz_mount_image$ext4-bpf$PROG_LOAD-quotactl$Q_SETINFO-ioctl$sock_inet_SIOCGIFPFLAGS-sendmsg$TIPC_NL_BEARER_ADD
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
r6 = socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
r7 = syz_genetlink_get_family_id$tipc2(&(0x7f00000001c0), 0xffffffffffffffff)
syz_mount_image$ext4(&(0x7f00000000c0)='ext4\x00', &(0x7f00000001c0)='./file1\x00', 0x800, &(0x7f0000000880)={[{@nouid32}, {@errors_remount}, {@discard}, {@dioread_lock}, {@resuid}]}, 0x1, 0x503, &(0x7f0000000200)="$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")
bpf$PROG_LOAD(0x5, &(0x7f000000e000)={0xd, 0x4, &(0x7f0000000040)=@framed={{0xffffffb4, 0x0, 0x0, 0x0, 0x0, 0x61, 0x11, 0x3c}, [@ldst={0x6, 0x3}], {0x95, 0x0, 0xc00}}, &(0x7f0000003ff6)='GPL\x00', 0x2, 0xc3, &(0x7f000000cf3d)=""/195, 0x0, 0x0, '\x00', 0x0, @sock_ops, 0xffffffffffffffff, 0x8, &(0x7f0000000000), 0x8, 0x10, &(0x7f0000000000), 0x10, 0x0, 0xffffffffffffffff, 0xfffffffffffffd8b}, 0x3c)
quotactl$Q_SETINFO(0xffffffff80000601, &(0x7f0000000040)=@loop={'/dev/loop', 0x0}, 0x0, &(0x7f0000002780)={0x7d, 0x6, 0x0, 0x4})
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})
sendmsg$TIPC_NL_BEARER_ADD(r6, &(0x7f0000000400)={0x0, 0x0, &(0x7f0000000240)={&(0x7f0000000440)=ANY=[@ANYBLOB='(\x00\x00\x00', @ANYRES16=r7, @ANYBLOB="991f28bd70400700f77f0d"], 0x28}, 0x1, 0x0, 0x0, 0x24000884}, 0x2400c000)

program crashed: KASAN: use-after-free Write in rcu_segcblist_enqueue
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-syz_genetlink_get_family_id$tipc2-syz_mount_image$ext4-bpf$PROG_LOAD-quotactl$Q_SETINFO-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
syz_genetlink_get_family_id$tipc2(&(0x7f00000001c0), 0xffffffffffffffff)
syz_mount_image$ext4(&(0x7f00000000c0)='ext4\x00', &(0x7f00000001c0)='./file1\x00', 0x800, &(0x7f0000000880)={[{@nouid32}, {@errors_remount}, {@discard}, {@dioread_lock}, {@resuid}]}, 0x1, 0x503, &(0x7f0000000200)="$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")
bpf$PROG_LOAD(0x5, &(0x7f000000e000)={0xd, 0x4, &(0x7f0000000040)=@framed={{0xffffffb4, 0x0, 0x0, 0x0, 0x0, 0x61, 0x11, 0x3c}, [@ldst={0x6, 0x3}], {0x95, 0x0, 0xc00}}, &(0x7f0000003ff6)='GPL\x00', 0x2, 0xc3, &(0x7f000000cf3d)=""/195, 0x0, 0x0, '\x00', 0x0, @sock_ops, 0xffffffffffffffff, 0x8, &(0x7f0000000000), 0x8, 0x10, &(0x7f0000000000), 0x10, 0x0, 0xffffffffffffffff, 0xfffffffffffffd8b}, 0x3c)
quotactl$Q_SETINFO(0xffffffff80000601, &(0x7f0000000040)=@loop={'/dev/loop', 0x0}, 0x0, &(0x7f0000002780)={0x7d, 0x6, 0x0, 0x4})
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-syz_genetlink_get_family_id$tipc2-syz_mount_image$ext4-bpf$PROG_LOAD-quotactl$Q_SETINFO
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
syz_genetlink_get_family_id$tipc2(&(0x7f00000001c0), 0xffffffffffffffff)
syz_mount_image$ext4(&(0x7f00000000c0)='ext4\x00', &(0x7f00000001c0)='./file1\x00', 0x800, &(0x7f0000000880)={[{@nouid32}, {@errors_remount}, {@discard}, {@dioread_lock}, {@resuid}]}, 0x1, 0x503, &(0x7f0000000200)="$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")
bpf$PROG_LOAD(0x5, &(0x7f000000e000)={0xd, 0x4, &(0x7f0000000040)=@framed={{0xffffffb4, 0x0, 0x0, 0x0, 0x0, 0x61, 0x11, 0x3c}, [@ldst={0x6, 0x3}], {0x95, 0x0, 0xc00}}, &(0x7f0000003ff6)='GPL\x00', 0x2, 0xc3, &(0x7f000000cf3d)=""/195, 0x0, 0x0, '\x00', 0x0, @sock_ops, 0xffffffffffffffff, 0x8, &(0x7f0000000000), 0x8, 0x10, &(0x7f0000000000), 0x10, 0x0, 0xffffffffffffffff, 0xfffffffffffffd8b}, 0x3c)
quotactl$Q_SETINFO(0xffffffff80000601, &(0x7f0000000040)=@loop={'/dev/loop', 0x0}, 0x0, &(0x7f0000002780)={0x7d, 0x6, 0x0, 0x4})

program did not crash
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-syz_genetlink_get_family_id$tipc2-syz_mount_image$ext4-bpf$PROG_LOAD-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
syz_genetlink_get_family_id$tipc2(&(0x7f00000001c0), 0xffffffffffffffff)
syz_mount_image$ext4(&(0x7f00000000c0)='ext4\x00', &(0x7f00000001c0)='./file1\x00', 0x800, &(0x7f0000000880)={[{@nouid32}, {@errors_remount}, {@discard}, {@dioread_lock}, {@resuid}]}, 0x1, 0x503, &(0x7f0000000200)="$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")
bpf$PROG_LOAD(0x5, &(0x7f000000e000)={0xd, 0x4, &(0x7f0000000040)=@framed={{0xffffffb4, 0x0, 0x0, 0x0, 0x0, 0x61, 0x11, 0x3c}, [@ldst={0x6, 0x3}], {0x95, 0x0, 0xc00}}, &(0x7f0000003ff6)='GPL\x00', 0x2, 0xc3, &(0x7f000000cf3d)=""/195, 0x0, 0x0, '\x00', 0x0, @sock_ops, 0xffffffffffffffff, 0x8, &(0x7f0000000000), 0x8, 0x10, &(0x7f0000000000), 0x10, 0x0, 0xffffffffffffffff, 0xfffffffffffffd8b}, 0x3c)
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-syz_genetlink_get_family_id$tipc2-syz_mount_image$ext4-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
syz_genetlink_get_family_id$tipc2(&(0x7f00000001c0), 0xffffffffffffffff)
syz_mount_image$ext4(&(0x7f00000000c0)='ext4\x00', &(0x7f00000001c0)='./file1\x00', 0x800, &(0x7f0000000880)={[{@nouid32}, {@errors_remount}, {@discard}, {@dioread_lock}, {@resuid}]}, 0x1, 0x503, &(0x7f0000000200)="$eJzs3c9vI1cdAPDvzMZJmqZNCpUKCOhSCgtarZ1k21XV03IBoaoSouLEIQ2JN4pir6PYKU1YaZP/AYlKHBCcOHNA4lCpJ44IbnDrpRyQCiygBomD0djjbJK186Ob2K39+Ugjz3tvdr7vxZr3vN/d+AUwsq5GxG5EjEfEmxExk9cn+RG320d23UcP7i3vP7i3nESz+cY/klZ7VheH/kzmyfyekxHx/e9E/ChruH80bn17Z32pUilv5uVSo7pRqm/v3FirLq2WV8t3FxZuzd+ae+XmywsXNtbnq7/58Ntrr/3g3d996YM/7X7zJ1m3pvO2w+M4k92zXdb+mRQO4mTGIuK1cwX75LqSj2c8f+XTJY2Iz0TEC63nfyaunONdTC61ZwDAZWk2Z6I5c7gMAAy7tJUDS9JinguYjjQtFts5vGdjKq3U6o3rd2pbd1faubLZKKR31irluTxXOBuFJCvP38/OH5YX4mj5ZkQ8ExE/nXiiVS4uyxYBwKA8eWz9/89Ee/0HAIbc5GkXLB6v+Nel9QUA6I9T138AYOhY/wFg9Fj/AWD0WP8BYPScc/2/fVn9AAD65f3O+n9l0D0BAPrie6+/nh3N/fz7r1fe2t5ar711Y6VcXy9Wt5aLy7XNjeJqrbZaKReXa9XT7lep1TbmX4qtt0uNcr1Rqm/vLFZrW3cbi63v9V4sF/oyKgDgJM88/95fkojYffWJ1hH5Xg7R2rUCGGbpoDsADIycP4wu38INo8vf8YHT9vLs+V+E3/k4wewcCp8E1z4v/w+jSv4fRpf8P4wu+X8YXc1m0mvP//TgEgBgqMjxA339938AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAYEtOtY/ZQOU2LxYinImI2CsmdtUp5LiKejog/TxQmsvL8QHsMADy+9G9Jvv/XtZkXp4+3jif/bdWNR8SPf/7Gz95eajQ257P6f0506hvv5PULg+g/AHCazjrdWcc7Pnpwb7lz9LM/H36rvbloFnc/P9otYzGWvfxxMgoRMfXvpF3OZZ9XrlxA/N29iPhct/EnrdzIbL7z6fH4Weyn+ho/PRI/bbW1X7OfxWcfufNEz5in7fUKo+K9bP653e35S+Nq63Wy6+bHk60Z6vF15r/9R+a/zvM+2Zprus1/V88a46Xff7dn217EF8a6xU8O4ic94r94xvjvf/HLL/Rqa/4y4lp0j384VqlR3SjVt3durFWX7uf187fmXrn58kKplaMudTLVj/r7q9ef7jn+X0dM9Yg/ecr4v3biqJsHE/Cv/vfmD7/SK/5exDe+2v39f/aE+Nma+PUT4z+0NPXbntt3Z/FX2uPfO+/7f/2M8T/4687KGS8FAPqgvr2zvlSplDcv9KQQF3zDQyfJJfXZyZCfZJ/HH/c+z+Ups67X/OEX7z6XNQ58pEdOPm5/BjwxAZfu4UM/6J4AAAAAAAAAAAAAAAC9XPovIaWDHiEAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAADD7P8BAAD//6gbyP8=")
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-syz_genetlink_get_family_id$tipc2-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
syz_genetlink_get_family_id$tipc2(&(0x7f00000001c0), 0xffffffffffffffff)
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-epoll_pwait2-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
socket$nl_generic(0x10, 0x3, 0x10)
epoll_pwait2(0xffffffffffffffff, 0x0, 0x0, 0x0, &(0x7f0000000140)={[0x8]}, 0x8)
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-socket$nl_generic-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
socket$nl_generic(0x10, 0x3, 0x10)
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
r5 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r5, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-socket$inet6_udp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program did not crash
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$pppl2tp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r4, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r4, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program did not crash
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', <r3=>0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
ioctl$sock_ipv6_tunnel_SIOCCHGTUNNEL(r1, 0x89f3, &(0x7f0000000980)={'syztnl2\x00', &(0x7f0000000900)={'ip6gre0\x00', r3, 0x4, 0x5, 0x1, 0x80000001, 0x1, @mcast1, @empty, 0x20, 0x8, 0x8, 0x7fff}})
r4 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(0xffffffffffffffff, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r4, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(0xffffffffffffffff, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program did not crash
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
ioctl$sock_ipv4_tunnel_SIOCGETTUNNEL(0xffffffffffffffff, 0x89f0, &(0x7f0000000800)={'gretap0\x00', &(0x7f0000000740)={'syztnl1\x00', 0x0, 0x20, 0x40, 0xe, 0xf4, {{0x1d, 0x4, 0x0, 0x1b, 0x74, 0x67, 0x0, 0x81, 0x29, 0x0, @private=0xa010100, @broadcast, {[@ssrr={0x89, 0xf, 0x22, [@multicast2, @initdev={0xac, 0x1e, 0x0, 0x0}, @loopback]}, @timestamp_prespec={0x44, 0x3c, 0x57, 0x3, 0x0, [{@loopback, 0x94}, {@dev={0xac, 0x14, 0x14, 0x26}, 0x7}, {@initdev={0xac, 0x1e, 0x1, 0x0}, 0x8}, {@remote, 0x3}, {@local, 0x1}, {@multicast1, 0x8001}, {@multicast1, 0x1}]}, @ssrr={0x89, 0x13, 0xb5, [@loopback, @empty, @multicast1, @local]}]}}}}})
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
r4 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r3, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r4, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r3, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in rcu_segcblist_enqueue
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$inet6(0xa, 0x3, 0x5)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r2, 0x29, 0x20, &(0x7f00000000c0)={@rand_addr=' \x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x02', 0x800, 0x0, 0x3, 0x9}, 0x20)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
r4 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r3, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r4, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r3, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in rcu_cblist_dequeue
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$inet6-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
socket$inet6(0xa, 0x3, 0x5)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r2, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r3, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r2, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f00000000c0)={@mcast2, 0x800000, 0x0, 0x1, 0x1, 0x4, 0x6}, 0x20)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r2, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r3, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r2, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-setsockopt$inet6_IPV6_FLOWLABEL_MGR-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$inet6(0xa, 0x1, 0x0)
setsockopt$inet6_IPV6_FLOWLABEL_MGR(r1, 0x29, 0x20, &(0x7f0000000200)={@private0, 0x800, 0x0, 0x1, 0x1}, 0x20)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
r3 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r2, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r3, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r2, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$inet6-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
socket$inet6(0xa, 0x1, 0x0)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
r2 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r1, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r2, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r1, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-ioctl$TIOCSETD-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f00000003c0)=0x11)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
r2 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r1, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r2, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r1, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-ioctl$TIOCSETD-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
ioctl$TIOCSETD(r0, 0x5423, &(0x7f0000000300)=0x1b)
r1 = socket$pppl2tp(0x18, 0x1, 0x1)
r2 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r1, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r2, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r1, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in rcu_cblist_dequeue
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-openat$ttyS3-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000000), 0x129402, 0x0)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in rcu_cblist_dequeue
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-capset-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
capset(&(0x7f0000000040)={0x20071026}, &(0x7f0000000140)={0x0, 0x9, 0x0, 0x81, 0xfffffff9, 0xa})
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in rcu_cblist_dequeue
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mmap-socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
mmap(&(0x7f0000000000/0xfbe000)=nil, 0xfbe000, 0x2, 0x31, 0xffffffffffffffff, 0x1000000)
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, 0x0, 0x0)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, &(0x7f0000000040)={'pim6reg\x00'})

program did not crash
testing program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
extracting C reproducer
testing compiled C program (duration=34.519347679s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
simplifying C reproducer
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program did not crash
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:true UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, 0x0)

program crashed: KASAN: use-after-free Read in rcu_cblist_dequeue
validation run: crashed=true
testing program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, 0x0)

program crashed: KASAN: use-after-free Write in pppol2tp_release
validation run: crashed=true
testing program (duration=34.519347679s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$sock_inet_SIOCGIFPFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tpv3={0x18, 0x1, {0x3, r1, {0x2, 0x0, @dev}, 0x2}}, 0x2e)
ioctl$sock_inet_SIOCGIFPFLAGS(r0, 0x8935, 0x0)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
validation run: crashed=true
reproducing took 28m32.698518412s
repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
Read of size 4 at addr ffff88812d7f5400 by task syz.2.17/374

CPU: 0 PID: 374 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350
 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:434
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f01aeb9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe984da848 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffe984da930 RCX: 00007f01aeb9de99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000699c R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01aee25fac R14: 00007f01aee25fa8 R15: 00007f01aee25fa0
 </TASK>

Allocated by task 374:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc+0xb4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 l2tp_session_create+0x38/0xbd0 net/l2tp/l2tp_core.c:1609
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:771
 __sys_connect_file net/socket.c:2000 [inline]
 __sys_connect+0x3da/0x460 net/socket.c:2017
 __do_sys_connect net/socket.c:2027 [inline]
 __se_sys_connect net/socket.c:2024 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2024
 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 345:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3df/0x4d0 net/l2tp/l2tp_core.c:1582
 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1228 [inline]
 l2tp_tunnel_del_work+0x199/0x410 net/l2tp/l2tp_core.c:1266
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88812d7f5400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88812d7f5400, ffff88812d7f5600)

The buggy address belongs to the physical page:
page:ffffea0004b5fd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d7f4
head:ffffea0004b5fd00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 350, tgid 350 (kworker/u4:4), ts 27035534312, free_ts 25948046916
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 fib6_info_alloc+0x34/0xe0 net/ipv6/ip6_fib.c:156
 ip6_route_info_create+0x51b/0x14d0 net/ipv6/route.c:3796
 ip6_route_add+0x27/0x130 net/ipv6/route.c:3892
 addrconf_prefix_route net/ipv6/addrconf.c:2466 [inline]
 addrconf_add_linklocal+0x3d2/0x660 net/ipv6/addrconf.c:3285
 addrconf_addr_gen+0x542/0x690 net/ipv6/addrconf.c:3414
 addrconf_dev_config net/ipv6/addrconf.c:3459 [inline]
 addrconf_init_auto_addrs+0x872/0xbc0 net/ipv6/addrconf.c:3538
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621
 free_unref_page+0x93/0x530 mm/page_alloc.c:3719
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6020
 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739
 __vfree mm/vmalloc.c:2788 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2819
 kcov_put kernel/kcov.c:437 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:533
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0xaf2/0x2850 kernel/exit.c:887
 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030
 get_signal+0x167c/0x1700 kernel/signal.c:2895
 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303

Memory state around the buggy address:
 ffff88812d7f5300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88812d7f5380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88812d7f5400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88812d7f5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812d7f5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 1 PID: 374 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Modules linked in:
CPU: 1 PID: 374 Comm: syz.2.17 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Code: 5d c3 e8 5c b3 d5 fc be 02 00 00 00 eb 0a e8 50 b3 d5 fc be 01 00 00 00 4c 89 f7 e8 23 18 cd fd e9 0f ff ff ff e8 39 b3 d5 fc <0f> 0b 48 89 df e8 ff 00 00 00 eb bd e8 28 b3 d5 fc 4c 89 f7 be 03
RSP: 0018:ffffc90000957cb0 EFLAGS: 00010293
RAX: ffffffff849bb307 RBX: ffff88811499e000 RCX: ffff888113bc9440
RDX: 0000000000000000 RSI: 000000002e221cc0 RDI: 000000000c04eb7d
RBP: ffffc90000957cd0 R08: ffffffff87b757e7 R09: 1ffffffff0f6eafc
R10: dffffc0000000000 R11: fffffbfff0f6eafd R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000002e221cc0 R15: ffff88812d7f5400
FS:  000055555bc2b500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe984d9e10 CR3: 000000012d57b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:434
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f01aeb9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe984da848 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffe984da930 RCX: 00007f01aeb9de99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000699c R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01aee25fac R14: 00007f01aee25fa8 R15: 00007f01aee25fa0
 </TASK>
---[ end trace 0000000000000000 ]---

final repro crashed as (corrupted=false):
==================================================================
BUG: KASAN: use-after-free in pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
Read of size 4 at addr ffff88812d7f5400 by task syz.2.17/374

CPU: 0 PID: 374 Comm: syz.2.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x24 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x71/0x200 mm/kasan/report.c:316
 print_report+0x4a/0x60 mm/kasan/report.c:420
 kasan_report+0x122/0x150 mm/kasan/report.c:524
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:350
 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:434
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f01aeb9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe984da848 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffe984da930 RCX: 00007f01aeb9de99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000699c R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01aee25fac R14: 00007f01aee25fa8 R15: 00007f01aee25fa0
 </TASK>

Allocated by task 374:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505
 ____kasan_kmalloc mm/kasan/common.c:380 [inline]
 __kasan_kmalloc+0x95/0xb0 mm/kasan/common.c:389
 kasan_kmalloc include/linux/kasan.h:212 [inline]
 __do_kmalloc_node mm/slab_common.c:938 [inline]
 __kmalloc+0xb4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 l2tp_session_create+0x38/0xbd0 net/l2tp/l2tp_core.c:1609
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:771
 __sys_connect_file net/socket.c:2000 [inline]
 __sys_connect+0x3da/0x460 net/socket.c:2017
 __do_sys_connect net/socket.c:2027 [inline]
 __se_sys_connect net/socket.c:2024 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:2024
 x64_sys_call+0x88d/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2

Freed by task 345:
 kasan_save_stack mm/kasan/common.c:46 [inline]
 kasan_set_track+0x4b/0x70 mm/kasan/common.c:53
 kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516
 ____kasan_slab_free+0x132/0x180 mm/kasan/common.c:242
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:250
 kasan_slab_free include/linux/kasan.h:178 [inline]
 slab_free_hook mm/slub.c:1750 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1776
 slab_free mm/slub.c:3712 [inline]
 __kmem_cache_free+0xb7/0x1b0 mm/slub.c:3728
 kfree+0x6f/0xf0 mm/slab_common.c:990
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3df/0x4d0 net/l2tp/l2tp_core.c:1582
 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1228 [inline]
 l2tp_tunnel_del_work+0x199/0x410 net/l2tp/l2tp_core.c:1266
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295

The buggy address belongs to the object at ffff88812d7f5400
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88812d7f5400, ffff88812d7f5600)

The buggy address belongs to the physical page:
page:ffffea0004b5fd00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x12d7f4
head:ffffea0004b5fd00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 0000000000000000 dead000000000122 ffff888100042f00
raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected
page_owner tracks the page as allocated
page last allocated via order 2, migratetype Unmovable, gfp_mask 0x152a20(GFP_ATOMIC|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_HARDWALL), pid 350, tgid 350 (kworker/u4:4), ts 27035534312, free_ts 25948046916
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x1f5/0x210 mm/page_alloc.c:2672
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2679
 get_page_from_freelist+0x2ca9/0x2d20 mm/page_alloc.c:4586
 __alloc_pages+0x1fa/0x610 mm/page_alloc.c:5930
 alloc_slab_page+0x6e/0xf0 include/linux/gfp.h:-1
 allocate_slab mm/slub.c:1967 [inline]
 new_slab+0x98/0x3e0 mm/slub.c:2020
 ___slab_alloc+0x70f/0xb70 mm/slub.c:3177
 __slab_alloc+0x5e/0xa0 mm/slub.c:3263
 slab_alloc_node mm/slub.c:3348 [inline]
 __kmem_cache_alloc_node+0x204/0x2d0 mm/slub.c:3423
 __do_kmalloc_node mm/slab_common.c:937 [inline]
 __kmalloc+0xa4/0x1e0 mm/slab_common.c:951
 kmalloc include/linux/slab.h:568 [inline]
 kzalloc include/linux/slab.h:699 [inline]
 fib6_info_alloc+0x34/0xe0 net/ipv6/ip6_fib.c:156
 ip6_route_info_create+0x51b/0x14d0 net/ipv6/route.c:3796
 ip6_route_add+0x27/0x130 net/ipv6/route.c:3892
 addrconf_prefix_route net/ipv6/addrconf.c:2466 [inline]
 addrconf_add_linklocal+0x3d2/0x660 net/ipv6/addrconf.c:3285
 addrconf_addr_gen+0x542/0x690 net/ipv6/addrconf.c:3414
 addrconf_dev_config net/ipv6/addrconf.c:3459 [inline]
 addrconf_init_auto_addrs+0x872/0xbc0 net/ipv6/addrconf.c:3538
page last free stack trace:
 reset_page_owner include/linux/page_owner.h:26 [inline]
 free_pages_prepare mm/page_alloc.c:1580 [inline]
 free_pcp_prepare mm/page_alloc.c:1654 [inline]
 free_unref_page_prepare+0x80c/0x820 mm/page_alloc.c:3621
 free_unref_page+0x93/0x530 mm/page_alloc.c:3719
 free_the_page mm/page_alloc.c:863 [inline]
 __free_pages+0x67/0x100 mm/page_alloc.c:6020
 __vunmap+0xa3c/0xc00 mm/vmalloc.c:2739
 __vfree mm/vmalloc.c:2788 [inline]
 vfree+0x61/0x90 mm/vmalloc.c:2819
 kcov_put kernel/kcov.c:437 [inline]
 kcov_close+0x2b/0x50 kernel/kcov.c:533
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 exit_task_work include/linux/task_work.h:39 [inline]
 do_exit+0xaf2/0x2850 kernel/exit.c:887
 do_group_exit+0x21b/0x2e0 kernel/exit.c:1030
 get_signal+0x167c/0x1700 kernel/signal.c:2895
 arch_do_signal_or_restart+0xd1/0x11c0 arch/x86/kernel/signal.c:871
 exit_to_user_mode_loop+0x7a/0xb0 kernel/entry/common.c:174
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303

Memory state around the buggy address:
 ffff88812d7f5300: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88812d7f5380: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88812d7f5400: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88812d7f5480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88812d7f5500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 1 PID: 374 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Modules linked in:
CPU: 1 PID: 374 Comm: syz.2.17 Tainted: G    B              syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Code: 5d c3 e8 5c b3 d5 fc be 02 00 00 00 eb 0a e8 50 b3 d5 fc be 01 00 00 00 4c 89 f7 e8 23 18 cd fd e9 0f ff ff ff e8 39 b3 d5 fc <0f> 0b 48 89 df e8 ff 00 00 00 eb bd e8 28 b3 d5 fc 4c 89 f7 be 03
RSP: 0018:ffffc90000957cb0 EFLAGS: 00010293
RAX: ffffffff849bb307 RBX: ffff88811499e000 RCX: ffff888113bc9440
RDX: 0000000000000000 RSI: 000000002e221cc0 RDI: 000000000c04eb7d
RBP: ffffc90000957cd0 R08: ffffffff87b757e7 R09: 1ffffffff0f6eafc
R10: dffffc0000000000 R11: fffffbfff0f6eafd R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000002e221cc0 R15: ffff88812d7f5400
FS:  000055555bc2b500(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffe984d9e10 CR3: 000000012d57b000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:434
 __sock_release net/socket.c:652 [inline]
 sock_close+0xc9/0x220 net/socket.c:1389
 __fput+0x1fd/0x8f0 fs/file_table.c:320
 ____fput+0x15/0x20 fs/file_table.c:348
 task_work_run+0x1e1/0x250 kernel/task_work.c:203
 resume_user_mode_work include/linux/resume_user_mode.h:49 [inline]
 exit_to_user_mode_loop+0x9b/0xb0 kernel/entry/common.c:177
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:210
 __syscall_exit_to_user_mode_work kernel/entry/common.c:292 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:303
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:82
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f01aeb9de99
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe984da848 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffe984da930 RCX: 00007f01aeb9de99
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 000000000000699c R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33120000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f01aee25fac R14: 00007f01aee25fa8 R15: 00007f01aee25fa0
 </TASK>
---[ end trace 0000000000000000 ]---