Extracting prog: 25.558495714s
Minimizing prog: 17m48.639446625s
Simplifying prog options: 0s
Extracting C: 22.428006166s
Simplifying C: 2m56.498132518s


extracting reproducer from 60 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}}): socket$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN-ioctl$sock_inet_SIOCSIFFLAGS-syz_usb_connect$hid-syz_usb_control_io$hid-syz_usb_control_io$hid-syz_usb_control_io$hid-syz_usb_control_io$hid-ioctl$PPPIOCBRIDGECHAN
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000080)={'macsec0\x00', 0x1400})
r5 = syz_usb_connect$hid(0x2, 0x36, &(0x7f0000000440)=ANY=[@ANYBLOB="12010000000000407d1e9c3100000000000109022400010000000009040000010300000009210000000122070009058103"], 0x0)
syz_usb_control_io$hid(r5, 0x0, 0x0) (async)
syz_usb_control_io$hid(r5, 0x0, 0x0)
syz_usb_control_io$hid(r5, 0x0, &(0x7f0000000540)={0x2c, 0x0, 0x0, 0x0, &(0x7f0000000440)={0x20, 0x1, 0x3, "902ef8"}, 0x0}) (async)
syz_usb_control_io$hid(r5, 0x0, &(0x7f0000000540)={0x2c, 0x0, 0x0, 0x0, &(0x7f0000000440)={0x20, 0x1, 0x3, "902ef8"}, 0x0})
ioctl$PPPIOCBRIDGECHAN(r4, 0x40047435, &(0x7f0000000100)=0x5)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
single: successfully extracted reproducer
found reproducer with 24 syscalls
minimizing guilty program
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN-ioctl$sock_inet_SIOCSIFFLAGS-syz_usb_connect$hid-syz_usb_control_io$hid-syz_usb_control_io$hid-syz_usb_control_io$hid-syz_usb_control_io$hid
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000080)={'macsec0\x00', 0x1400})
r5 = syz_usb_connect$hid(0x2, 0x36, &(0x7f0000000440)=ANY=[@ANYBLOB="12010000000000407d1e9c3100000000000109022400010000000009040000010300000009210000000122070009058103"], 0x0)
syz_usb_control_io$hid(r5, 0x0, 0x0) (async)
syz_usb_control_io$hid(r5, 0x0, 0x0)
syz_usb_control_io$hid(r5, 0x0, &(0x7f0000000540)={0x2c, 0x0, 0x0, 0x0, &(0x7f0000000440)={0x20, 0x1, 0x3, "902ef8"}, 0x0}) (async)
syz_usb_control_io$hid(r5, 0x0, &(0x7f0000000540)={0x2c, 0x0, 0x0, 0x0, &(0x7f0000000440)={0x20, 0x1, 0x3, "902ef8"}, 0x0})

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN-ioctl$sock_inet_SIOCSIFFLAGS-syz_usb_connect$hid-syz_usb_control_io$hid-syz_usb_control_io$hid-syz_usb_control_io$hid
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000080)={'macsec0\x00', 0x1400})
r5 = syz_usb_connect$hid(0x2, 0x36, &(0x7f0000000440)=ANY=[@ANYBLOB="12010000000000407d1e9c3100000000000109022400010000000009040000010300000009210000000122070009058103"], 0x0)
syz_usb_control_io$hid(r5, 0x0, 0x0) (async)
syz_usb_control_io$hid(r5, 0x0, 0x0)
syz_usb_control_io$hid(r5, 0x0, &(0x7f0000000540)={0x2c, 0x0, 0x0, 0x0, &(0x7f0000000440)={0x20, 0x1, 0x3, "902ef8"}, 0x0}) (async)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN-ioctl$sock_inet_SIOCSIFFLAGS-syz_usb_connect$hid-syz_usb_control_io$hid-syz_usb_control_io$hid
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000080)={'macsec0\x00', 0x1400})
r5 = syz_usb_connect$hid(0x2, 0x36, &(0x7f0000000440)=ANY=[@ANYBLOB="12010000000000407d1e9c3100000000000109022400010000000009040000010300000009210000000122070009058103"], 0x0)
syz_usb_control_io$hid(r5, 0x0, 0x0) (async)
syz_usb_control_io$hid(r5, 0x0, 0x0)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN-ioctl$sock_inet_SIOCSIFFLAGS-syz_usb_connect$hid-syz_usb_control_io$hid
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000080)={'macsec0\x00', 0x1400})
r5 = syz_usb_connect$hid(0x2, 0x36, &(0x7f0000000440)=ANY=[@ANYBLOB="12010000000000407d1e9c3100000000000109022400010000000009040000010300000009210000000122070009058103"], 0x0)
syz_usb_control_io$hid(r5, 0x0, 0x0) (async)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN-ioctl$sock_inet_SIOCSIFFLAGS-syz_usb_connect$hid
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000080)={'macsec0\x00', 0x1400})
syz_usb_connect$hid(0x2, 0x36, &(0x7f0000000440)=ANY=[@ANYBLOB="12010000000000407d1e9c3100000000000109022400010000000009040000010300000009210000000122070009058103"], 0x0)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000080)={'macsec0\x00', 0x1400})

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN-ioctl$PPPIOCATTCHAN
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE-ioctl$PPPIOCATTCHAN
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
r4 = openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)
ioctl$PPPIOCATTCHAN(r4, 0x40047438, &(0x7f0000000500)=0x2) (async)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp-bpf$MAP_CREATE
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)
bpf$MAP_CREATE(0x2000000000000000, &(0x7f0000000600)=ANY=[@ANYBLOB="0600000004000000be7000005c00000000000000", @ANYRESOCT, @ANYBLOB='\x00', @ANYRES32=0x0, @ANYRES32, @ANYBLOB="1800000007"], 0x48)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp-openat$ppp
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp-openat$ppp
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)
openat$ppp(0xffffffffffffff9c, &(0x7f00000001c0), 0x8080, 0x0) (async)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp-connect$pppl2tp
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
r3 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r3, &(0x7f0000000040)=@pppol2tpv3={0x18, 0x1, {0x3, 0xffffffffffffffff, {0x2, 0x4e21, @broadcast}, 0x2, 0x9800, 0xfffffffd}}, 0x2e)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_get_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS-socket$pppl2tp
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)
socket$pppl2tp(0x18, 0x1, 0x1)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp-prctl$PR_GET_KEEPCAPS
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)
prctl$PR_GET_KEEPCAPS(0x7)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp-connect$pppl2tp
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
r2 = socket$pppl2tp(0x18, 0x1, 0x1)
connect$pppl2tp(r2, &(0x7f0000000180)=@pppol2tpin6={0x18, 0x1, {0x0, r0, 0x0, 0x4, 0x0, 0x4, {0xa, 0x4e21, 0xf, @private2, 0x10}}}, 0x32)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL-socket$pppl2tp
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)
socket$pppl2tp(0x18, 0x1, 0x1)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)

program crashed: KASAN: use-after-free Read in l2tp_tunnel_del_work
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-connect$pppl2tp
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)

program did not crash
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-socket$inet6_udp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
socket$inet6_udp(0xa, 0x2, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)

program did not crash
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
socket$inet6_udp(0xa, 0x2, 0x0) (async)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, 0xffffffffffffffff, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)

program did not crash
testing program (duration=33.363044694s, {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$pppl2tp-openat$ttyS3-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
openat$ttyS3(0xffffffffffffff9c, &(0x7f0000000140), 0x801, 0x0)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.363044694s, {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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2) (async)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.363044694s, {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$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(0xffffffffffffffff, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r0, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(0xffffffffffffffff, 0x40049421, 0x2) (async)

program did not crash
testing program (duration=33.363044694s, {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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)

program crashed: KASAN: use-after-free Write in pppol2tp_release
testing program (duration=33.363044694s, {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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, 0x0, 0x0)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)

program did not crash
extracting C reproducer
testing compiled C program (duration=33.363044694s, {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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: KASAN: use-after-free Write in pppol2tp_release
simplifying C reproducer
testing compiled C program (duration=33.363044694s, {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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=33.363044694s, {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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: KASAN: use-after-free Write in pppol2tp_release
testing compiled C program (duration=33.363044694s, {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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=33.363044694s, {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:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=33.363044694s, {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:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$pppl2tp-socket$inet6_udp-connect$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing compiled C program (duration=33.363044694s, {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: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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
testing program (duration=33.363044694s, {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: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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)

program crashed: KASAN: use-after-free Write in pppol2tp_release
validation run: crashed=true
testing program (duration=33.363044694s, {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: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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)

program crashed: KASAN: use-after-free Write in pppol2tp_release
validation run: crashed=true
testing program (duration=33.363044694s, {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: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$pppl2tp-ioctl$BTRFS_IOC_BALANCE_CTL
detailed listing:
executing program 0:
r0 = socket$pppl2tp(0x18, 0x1, 0x1)
r1 = socket$inet6_udp(0xa, 0x2, 0x0)
connect$pppl2tp(r0, &(0x7f0000000000)=@pppol2tp={0x18, 0x1, {0x0, r1, {0x2, 0x4e24, @broadcast}, 0x2, 0x0, 0x3}}, 0x26)
ioctl$BTRFS_IOC_BALANCE_CTL(r0, 0x40049421, 0x2)

program crashed: KASAN: use-after-free Read in pppol2tp_sock_to_session
validation run: crashed=true
reproducing took 23m21.319749735s
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 ffff88811033e800 by task syz.2.17/373

CPU: 0 PID: 373 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+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fda11b7be59
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:00007ffdd2944a18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffdd2944b00 RCX: 00007fda11b7be59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000071e8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda11df4fac R14: 00007fda11df4fa8 R15: 00007fda11df4fa0
 </TASK>

Allocated by task 373:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4436
 kmalloc include/linux/slab.h:624 [inline]
 kzalloc include/linux/slab.h:750 [inline]
 l2tp_session_create+0x39/0xb60 net/l2tp/l2tp_core.c:1616
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:772
 __sys_connect_file net/socket.c:1922 [inline]
 __sys_connect+0x3cb/0x450 net/socket.c:1939
 __do_sys_connect net/socket.c:1949 [inline]
 __se_sys_connect net/socket.c:1946 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:1946
 x64_sys_call+0x7c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 8:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kfree+0xc4/0x270 mm/slub.c:4588
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3a9/0x4a0 net/l2tp/l2tp_core.c:1589
 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1235 [inline]
 l2tp_tunnel_del_work+0x180/0x3d0 net/l2tp/l2tp_core.c:1273
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328
 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff88811033e800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88811033e800, ffff88811033ea00)
The buggy address belongs to the page:
page:ffffea000440cf00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11033c
head:ffffea000440cf00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea000443a400 0000000600000006 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 102, ts 5493550701, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x210/0x730 net/core/skbuff.c:428
 alloc_skb include/linux/skbuff.h:1183 [inline]
 alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290
 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
 kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409
 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608
 kobject_synth_uevent+0x457/0x940 lib/kobject_uevent.c:208
 store_uevent+0x16/0x30 kernel/module.c:1172
 module_attr_store+0x5f/0x80 kernel/params.c:919
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811033e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811033e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811033e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88811033e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811033e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 373 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Modules linked in:
CPU: 0 PID: 373 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 cc f2 0b fd be 02 00 00 00 eb 0a e8 c0 f2 0b fd be 01 00 00 00 4c 89 f7 e8 13 62 f2 fd e9 0f ff ff ff e8 a9 f2 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 98 f2 0b fd 4c 89 f7 be 03
RSP: 0018:ffffc90000b47d10 EFLAGS: 00010293
RAX: ffffffff845db907 RBX: ffff8881115da000 RCX: ffff8881105ba780
RDX: 0000000000000000 RSI: 000000000b808900 RDI: 000000000c04eb7d
RBP: ffffc90000b47d30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000000b808900 R15: ffff88811033e800
FS:  000055557e7cd500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda11c3c2ac CR3: 000000012c698000 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:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fda11b7be59
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:00007ffdd2944a18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffdd2944b00 RCX: 00007fda11b7be59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000071e8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda11df4fac R14: 00007fda11df4fa8 R15: 00007fda11df4fa0
 </TASK>
---[ end trace 30271f34002800df ]---

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 ffff88811033e800 by task syz.2.17/373

CPU: 0 PID: 373 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+0x21/0x30 lib/dump_stack.c:88
 dump_stack_lvl+0x110/0x170 lib/dump_stack.c:106
 print_address_description+0x7f/0x2c0 mm/kasan/report.c:248
 __kasan_report mm/kasan/report.c:427 [inline]
 kasan_report+0x10f/0x150 mm/kasan/report.c:444
 __asan_report_load4_noabort+0x14/0x20 mm/kasan/report_generic.c:308
 pppol2tp_sock_to_session+0x1a0/0x1b0 net/l2tp/l2tp_ppp.c:156
 pppol2tp_release+0x150/0x2b0 net/l2tp/l2tp_ppp.c:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fda11b7be59
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:00007ffdd2944a18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffdd2944b00 RCX: 00007fda11b7be59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000071e8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda11df4fac R14: 00007fda11df4fa8 R15: 00007fda11df4fa0
 </TASK>

Allocated by task 373:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track mm/kasan/common.c:45 [inline]
 set_alloc_info mm/kasan/common.c:433 [inline]
 ____kasan_kmalloc mm/kasan/common.c:512 [inline]
 __kasan_kmalloc+0xd4/0x100 mm/kasan/common.c:521
 kasan_kmalloc include/linux/kasan.h:227 [inline]
 __kmalloc+0x13d/0x2c0 mm/slub.c:4436
 kmalloc include/linux/slab.h:624 [inline]
 kzalloc include/linux/slab.h:750 [inline]
 l2tp_session_create+0x39/0xb60 net/l2tp/l2tp_core.c:1616
 pppol2tp_connect+0xbf5/0x1640 net/l2tp/l2tp_ppp.c:772
 __sys_connect_file net/socket.c:1922 [inline]
 __sys_connect+0x3cb/0x450 net/socket.c:1939
 __do_sys_connect net/socket.c:1949 [inline]
 __se_sys_connect net/socket.c:1946 [inline]
 __x64_sys_connect+0x7a/0x90 net/socket.c:1946
 x64_sys_call+0x7c/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:43
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0

Freed by task 8:
 kasan_save_stack mm/kasan/common.c:38 [inline]
 kasan_set_track+0x4a/0x70 mm/kasan/common.c:45
 kasan_set_free_info+0x23/0x40 mm/kasan/generic.c:370
 ____kasan_slab_free+0x125/0x160 mm/kasan/common.c:365
 __kasan_slab_free+0x11/0x20 mm/kasan/common.c:373
 kasan_slab_free include/linux/kasan.h:193 [inline]
 slab_free_hook mm/slub.c:1728 [inline]
 slab_free_freelist_hook+0xc2/0x190 mm/slub.c:1754
 slab_free mm/slub.c:3526 [inline]
 kfree+0xc4/0x270 mm/slub.c:4588
 l2tp_session_free net/l2tp/l2tp_core.c:168 [inline]
 l2tp_session_put+0xaf/0x1a0 net/l2tp/l2tp_core.c:193
 l2tp_session_delete+0x3a9/0x4a0 net/l2tp/l2tp_core.c:1589
 l2tp_tunnel_closeall net/l2tp/l2tp_core.c:1235 [inline]
 l2tp_tunnel_del_work+0x180/0x3d0 net/l2tp/l2tp_core.c:1273
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328
 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287

The buggy address belongs to the object at ffff88811033e800
 which belongs to the cache kmalloc-512 of size 512
The buggy address is located 0 bytes inside of
 512-byte region [ffff88811033e800, ffff88811033ea00)
The buggy address belongs to the page:
page:ffffea000440cf00 refcount:1 mapcount:0 mapping:0000000000000000 index:0x0 pfn:0x11033c
head:ffffea000440cf00 order:2 compound_mapcount:0 compound_pincount:0
flags: 0x4000000000010200(slab|head|zone=1)
raw: 4000000000010200 ffffea000443a400 0000000600000006 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 0xd20c0(__GFP_IO|__GFP_FS|__GFP_NOWARN|__GFP_NORETRY|__GFP_COMP|__GFP_NOMEMALLOC), pid 102, ts 5493550701, free_ts 0
 set_page_owner include/linux/page_owner.h:33 [inline]
 post_alloc_hook+0x192/0x1b0 mm/page_alloc.c:2607
 prep_new_page+0x1c/0x110 mm/page_alloc.c:2613
 get_page_from_freelist+0x2c3a/0x2cd0 mm/page_alloc.c:4487
 __alloc_pages+0x1a2/0x460 mm/page_alloc.c:5824
 alloc_slab_page mm/slub.c:-1 [inline]
 allocate_slab mm/slub.c:1937 [inline]
 new_slab+0xa0/0x4d0 mm/slub.c:2000
 ___slab_alloc+0x3ac/0x840 mm/slub.c:3033
 __slab_alloc+0x49/0x90 mm/slub.c:3120
 slab_alloc_node mm/slub.c:3211 [inline]
 slab_alloc mm/slub.c:3255 [inline]
 __kmalloc_track_caller+0x169/0x2c0 mm/slub.c:4954
 kmalloc_reserve net/core/skbuff.c:357 [inline]
 __alloc_skb+0x210/0x730 net/core/skbuff.c:428
 alloc_skb include/linux/skbuff.h:1183 [inline]
 alloc_uevent_skb+0x85/0x240 lib/kobject_uevent.c:290
 uevent_net_broadcast_untagged lib/kobject_uevent.c:326 [inline]
 kobject_uevent_net_broadcast+0x335/0x5a0 lib/kobject_uevent.c:409
 kobject_uevent_env+0x52b/0x700 lib/kobject_uevent.c:608
 kobject_synth_uevent+0x457/0x940 lib/kobject_uevent.c:208
 store_uevent+0x16/0x30 kernel/module.c:1172
 module_attr_store+0x5f/0x80 kernel/params.c:919
 sysfs_kf_write+0x129/0x150 fs/sysfs/file.c:139
page_owner free stack trace missing

Memory state around the buggy address:
 ffff88811033e700: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
 ffff88811033e780: fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc fc
>ffff88811033e800: fa fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                   ^
 ffff88811033e880: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88811033e900: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================
------------[ cut here ]------------
WARNING: CPU: 0 PID: 373 at net/l2tp/l2tp_ppp.c:156 pppol2tp_sock_to_session+0x167/0x1b0 net/l2tp/l2tp_ppp.c:156
Modules linked in:
CPU: 0 PID: 373 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 cc f2 0b fd be 02 00 00 00 eb 0a e8 c0 f2 0b fd be 01 00 00 00 4c 89 f7 e8 13 62 f2 fd e9 0f ff ff ff e8 a9 f2 0b fd <0f> 0b 48 89 df e8 ef 00 00 00 eb bd e8 98 f2 0b fd 4c 89 f7 be 03
RSP: 0018:ffffc90000b47d10 EFLAGS: 00010293
RAX: ffffffff845db907 RBX: ffff8881115da000 RCX: ffff8881105ba780
RDX: 0000000000000000 RSI: 000000000b808900 RDI: 000000000c04eb7d
RBP: ffffc90000b47d30 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff0e18c4c R12: dffffc0000000000
R13: dffffc0000000000 R14: 000000000b808900 R15: ffff88811033e800
FS:  000055557e7cd500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fda11c3c2ac CR3: 000000012c698000 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:435
 __sock_release net/socket.c:649 [inline]
 sock_close+0xb8/0x200 net/socket.c:1335
 __fput+0x22b/0x900 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fda11b7be59
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:00007ffdd2944a18 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007ffdd2944b00 RCX: 00007fda11b7be59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00000000000071e8 R08: 0000000000000001 R09: 0000000000000000
R10: 0000001b33020000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fda11df4fac R14: 00007fda11df4fa8 R15: 00007fda11df4fa0
 </TASK>
---[ end trace 30271f34002800df ]---