Extracting prog: 34.014768819s
Minimizing prog: 26m35.279573117s
Simplifying prog options: 0s
Extracting C: 1m3.652803948s
Simplifying C: 25m41.110179983s


extracting reproducer from 27 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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-open-socket$kcm-sendmsg$kcm-setsockopt$MRT_FLUSH-ioctl$sock_SIOCGIFINDEX-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
r3 = open(&(0x7f0000000040)='./bus\x00', 0x80242, 0x0)
r4 = socket$kcm(0x10, 0x2, 0x4)
sendmsg$kcm(r4, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000080)=[{&(0x7f0000000100)}], 0x1}, 0x0)
setsockopt$MRT_FLUSH(r3, 0x0, 0xd4, &(0x7f00000000c0)=0x1, 0x4)
ioctl$sock_SIOCGIFINDEX(0xffffffffffffffff, 0x8933, &(0x7f0000000340)={'syz_tun\x00'})
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
single: successfully extracted reproducer
found reproducer with 14 syscalls
minimizing guilty program
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-open-socket$kcm-sendmsg$kcm-setsockopt$MRT_FLUSH-ioctl$sock_SIOCGIFINDEX
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
r2 = open(&(0x7f0000000040)='./bus\x00', 0x80242, 0x0)
r3 = socket$kcm(0x10, 0x2, 0x4)
sendmsg$kcm(r3, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000080)=[{&(0x7f0000000100)}], 0x1}, 0x0)
setsockopt$MRT_FLUSH(r2, 0x0, 0xd4, &(0x7f00000000c0)=0x1, 0x4)
ioctl$sock_SIOCGIFINDEX(0xffffffffffffffff, 0x8933, &(0x7f0000000340)={'syz_tun\x00'})

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-open-socket$kcm-sendmsg$kcm-setsockopt$MRT_FLUSH-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
r3 = open(&(0x7f0000000040)='./bus\x00', 0x80242, 0x0)
r4 = socket$kcm(0x10, 0x2, 0x4)
sendmsg$kcm(r4, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000080)=[{&(0x7f0000000100)}], 0x1}, 0x0)
setsockopt$MRT_FLUSH(r3, 0x0, 0xd4, &(0x7f00000000c0)=0x1, 0x4)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-open-socket$kcm-sendmsg$kcm-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
open(&(0x7f0000000040)='./bus\x00', 0x80242, 0x0)
r3 = socket$kcm(0x10, 0x2, 0x4)
sendmsg$kcm(r3, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000080)=[{&(0x7f0000000100)}], 0x1}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-open-socket$kcm-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
open(&(0x7f0000000040)='./bus\x00', 0x80242, 0x0)
socket$kcm(0x10, 0x2, 0x4)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-open-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
open(&(0x7f0000000040)='./bus\x00', 0x80242, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
socket$inet_icmp_raw(0x2, 0x3, 0x1)
r1 = socket$igmp(0x2, 0x3, 0x2)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r1, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(0xffffffffffffffff, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(0xffffffffffffffff, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r1, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_INIT-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-socket$igmp-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$inet_udp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
socket$inet_udp(0x2, 0x2, 0x0)
setsockopt$MRT_INIT(0xffffffffffffffff, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(0xffffffffffffffff, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r0 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r1 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r0, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r1, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, 0x0, 0x0)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, 0x0, 0x0)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, 0x0, 0x0)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x0, 0x0, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program did not crash
testing program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
simplifying C reproducer
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program did not crash
testing compiled C program (duration=44.19557461s, {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:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program did not crash
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true 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$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true 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$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing compiled C program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
program crashed: WARNING: suspicious RCU usage in rhltable_lookup
testing program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true 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$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
validation run: crashed=true
testing program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true 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$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
validation run: crashed=true
testing program (duration=44.19557461s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true 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$igmp-setsockopt$MRT_INIT-setsockopt$MRT_ADD_VIF-socket$inet_icmp_raw-socket$igmp-setsockopt$inet_mreq-syz_emit_ethernet-setsockopt$MRT_ADD_MFC_PROXY
detailed listing:
executing program 0:
r0 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$MRT_INIT(r0, 0x0, 0xc8, &(0x7f0000003d40), 0x4)
setsockopt$MRT_ADD_VIF(r0, 0x0, 0xca, &(0x7f0000003d80)={0x0, 0x0, 0x0, 0x0, @vifc_lcl_addr=@local, @dev}, 0x10)
r1 = socket$inet_icmp_raw(0x2, 0x3, 0x1)
r2 = socket$igmp(0x2, 0x3, 0x2)
setsockopt$inet_mreq(r1, 0x0, 0x23, &(0x7f0000000000)={@multicast1=0xe0000300, @local}, 0x8)
syz_emit_ethernet(0x2a, &(0x7f0000000040)={@local, @broadcast, @void, {@ipv4={0x800, @icmp={{0x5, 0x4, 0x0, 0x0, 0x1c, 0x0, 0x0, 0x80, 0x2, 0x0, @empty, @multicast1=0xe0000300}, @echo_reply={0x0, 0x0, 0x0, 0x64, 0xd2}}}}}, 0x0)
setsockopt$MRT_ADD_MFC_PROXY(r2, 0x0, 0xd2, &(0x7f0000000200)={@empty, @multicast2=0xe0000300, 0x0, "028a3f6c58b274e6d8451697efe42811ee1df06e9264f7d866b1970548fc3c7b", 0xb2, 0xfffffff7, 0x4, 0x40000006}, 0x3c)

program crashed: WARNING: suspicious RCU usage in rhltable_lookup
validation run: crashed=true
reproducing took 59m30.838816494s
repro crashed as (corrupted=false):
=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
include/linux/rhashtable.h:594 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz.0.17/4349:
 #0: ffffffff8d238048 (rtnl_mutex){+.+.}-{3:3}, at: ip_mroute_setsockopt+0x105/0x11a0 net/ipv4/ipmr.c:1362

stack backtrace:
CPU: 1 PID: 4349 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __rhashtable_lookup include/linux/rhashtable.h:594 [inline]
 rhltable_lookup+0x77b/0x790 include/linux/rhashtable.h:688
 mr_mfc_find_any_parent+0xb6/0x1e0 net/ipv4/ipmr_base.c:83
 ip_mr_forward+0x24c/0xf90 net/ipv4/ipmr.c:1949
 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline]
 ipmr_mfc_add+0x2466/0x2eb0 net/ipv4/ipmr.c:1262
 ip_mroute_setsockopt+0xe33/0x11a0 net/ipv4/ipmr.c:1459
 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline]
 ip_setsockopt+0x4ad/0x3070 net/ipv4/ip_sockglue.c:1430
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 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
RIP: 0033:0x7fb9b92fbba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef6b18448 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb9b9542fa0 RCX: 00007fb9b92fbba9
RDX: 00000000000000d2 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fb9b937ee19 R08: 000000000000003c R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9b9542fa0 R14: 00007fb9b9542fa0 R15: 0000000000000005
 </TASK>

=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
include/linux/rhashtable.h:369 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz.0.17/4349:
 #0: ffffffff8d238048 (rtnl_mutex){+.+.}-{3:3}, at: ip_mroute_setsockopt+0x105/0x11a0 net/ipv4/ipmr.c:1362

stack backtrace:
CPU: 1 PID: 4349 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 rht_ptr_rcu include/linux/rhashtable.h:369 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:599 [inline]
 rhltable_lookup+0x504/0x790 include/linux/rhashtable.h:688
 mr_mfc_find_any_parent+0xb6/0x1e0 net/ipv4/ipmr_base.c:83
 ip_mr_forward+0x24c/0xf90 net/ipv4/ipmr.c:1949
 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline]
 ipmr_mfc_add+0x2466/0x2eb0 net/ipv4/ipmr.c:1262
 ip_mroute_setsockopt+0xe33/0x11a0 net/ipv4/ipmr.c:1459
 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline]
 ip_setsockopt+0x4ad/0x3070 net/ipv4/ip_sockglue.c:1430
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 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
RIP: 0033:0x7fb9b92fbba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef6b18448 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb9b9542fa0 RCX: 00007fb9b92fbba9
RDX: 00000000000000d2 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fb9b937ee19 R08: 000000000000003c R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9b9542fa0 R14: 00007fb9b9542fa0 R15: 0000000000000005
 </TASK>

=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
include/linux/rhashtable.h:614 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz.0.17/4349:
 #0: ffffffff8d238048 (rtnl_mutex){+.+.}-{3:3}, at: ip_mroute_setsockopt+0x105/0x11a0 net/ipv4/ipmr.c:1362

stack backtrace:
CPU: 1 PID: 4349 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __rhashtable_lookup include/linux/rhashtable.h:614 [inline]
 rhltable_lookup+0x5f8/0x790 include/linux/rhashtable.h:688
 mr_mfc_find_any_parent+0xb6/0x1e0 net/ipv4/ipmr_base.c:83
 ip_mr_forward+0x24c/0xf90 net/ipv4/ipmr.c:1949
 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline]
 ipmr_mfc_add+0x2466/0x2eb0 net/ipv4/ipmr.c:1262
 ip_mroute_setsockopt+0xe33/0x11a0 net/ipv4/ipmr.c:1459
 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline]
 ip_setsockopt+0x4ad/0x3070 net/ipv4/ip_sockglue.c:1430
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 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
RIP: 0033:0x7fb9b92fbba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef6b18448 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb9b9542fa0 RCX: 00007fb9b92fbba9
RDX: 00000000000000d2 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fb9b937ee19 R08: 000000000000003c R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9b9542fa0 R14: 00007fb9b9542fa0 R15: 0000000000000005
 </TASK>

final repro crashed as (corrupted=false):
=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
include/linux/rhashtable.h:594 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz.0.17/4349:
 #0: ffffffff8d238048 (rtnl_mutex){+.+.}-{3:3}, at: ip_mroute_setsockopt+0x105/0x11a0 net/ipv4/ipmr.c:1362

stack backtrace:
CPU: 1 PID: 4349 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __rhashtable_lookup include/linux/rhashtable.h:594 [inline]
 rhltable_lookup+0x77b/0x790 include/linux/rhashtable.h:688
 mr_mfc_find_any_parent+0xb6/0x1e0 net/ipv4/ipmr_base.c:83
 ip_mr_forward+0x24c/0xf90 net/ipv4/ipmr.c:1949
 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline]
 ipmr_mfc_add+0x2466/0x2eb0 net/ipv4/ipmr.c:1262
 ip_mroute_setsockopt+0xe33/0x11a0 net/ipv4/ipmr.c:1459
 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline]
 ip_setsockopt+0x4ad/0x3070 net/ipv4/ip_sockglue.c:1430
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 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
RIP: 0033:0x7fb9b92fbba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef6b18448 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb9b9542fa0 RCX: 00007fb9b92fbba9
RDX: 00000000000000d2 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fb9b937ee19 R08: 000000000000003c R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9b9542fa0 R14: 00007fb9b9542fa0 R15: 0000000000000005
 </TASK>

=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
include/linux/rhashtable.h:369 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz.0.17/4349:
 #0: ffffffff8d238048 (rtnl_mutex){+.+.}-{3:3}, at: ip_mroute_setsockopt+0x105/0x11a0 net/ipv4/ipmr.c:1362

stack backtrace:
CPU: 1 PID: 4349 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 rht_ptr_rcu include/linux/rhashtable.h:369 [inline]
 __rhashtable_lookup include/linux/rhashtable.h:599 [inline]
 rhltable_lookup+0x504/0x790 include/linux/rhashtable.h:688
 mr_mfc_find_any_parent+0xb6/0x1e0 net/ipv4/ipmr_base.c:83
 ip_mr_forward+0x24c/0xf90 net/ipv4/ipmr.c:1949
 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline]
 ipmr_mfc_add+0x2466/0x2eb0 net/ipv4/ipmr.c:1262
 ip_mroute_setsockopt+0xe33/0x11a0 net/ipv4/ipmr.c:1459
 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline]
 ip_setsockopt+0x4ad/0x3070 net/ipv4/ip_sockglue.c:1430
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 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
RIP: 0033:0x7fb9b92fbba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef6b18448 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb9b9542fa0 RCX: 00007fb9b92fbba9
RDX: 00000000000000d2 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fb9b937ee19 R08: 000000000000003c R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9b9542fa0 R14: 00007fb9b9542fa0 R15: 0000000000000005
 </TASK>

=============================
WARNING: suspicious RCU usage
syzkaller #0 Not tainted
-----------------------------
include/linux/rhashtable.h:614 suspicious rcu_dereference_check() usage!

other info that might help us debug this:


rcu_scheduler_active = 2, debug_locks = 1
1 lock held by syz.0.17/4349:
 #0: ffffffff8d238048 (rtnl_mutex){+.+.}-{3:3}, at: ip_mroute_setsockopt+0x105/0x11a0 net/ipv4/ipmr.c:1362

stack backtrace:
CPU: 1 PID: 4349 Comm: syz.0.17 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Call Trace:
 <TASK>
 dump_stack_lvl+0x168/0x230 lib/dump_stack.c:106
 __rhashtable_lookup include/linux/rhashtable.h:614 [inline]
 rhltable_lookup+0x5f8/0x790 include/linux/rhashtable.h:688
 mr_mfc_find_any_parent+0xb6/0x1e0 net/ipv4/ipmr_base.c:83
 ip_mr_forward+0x24c/0xf90 net/ipv4/ipmr.c:1949
 ipmr_cache_resolve net/ipv4/ipmr.c:1003 [inline]
 ipmr_mfc_add+0x2466/0x2eb0 net/ipv4/ipmr.c:1262
 ip_mroute_setsockopt+0xe33/0x11a0 net/ipv4/ipmr.c:1459
 do_ip_setsockopt net/ipv4/ip_sockglue.c:947 [inline]
 ip_setsockopt+0x4ad/0x3070 net/ipv4/ip_sockglue.c:1430
 __sys_setsockopt+0x2bf/0x3d0 net/socket.c:2203
 __do_sys_setsockopt net/socket.c:2214 [inline]
 __se_sys_setsockopt net/socket.c:2211 [inline]
 __x64_sys_setsockopt+0xb1/0xc0 net/socket.c:2211
 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
RIP: 0033:0x7fb9b92fbba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffef6b18448 EFLAGS: 00000246 ORIG_RAX: 0000000000000036
RAX: ffffffffffffffda RBX: 00007fb9b9542fa0 RCX: 00007fb9b92fbba9
RDX: 00000000000000d2 RSI: 0000000000000000 RDI: 0000000000000005
RBP: 00007fb9b937ee19 R08: 000000000000003c R09: 0000000000000000
R10: 0000200000000200 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fb9b9542fa0 R14: 00007fb9b9542fa0 R15: 0000000000000005
 </TASK>