Extracting prog: 6m28.238271263s
Minimizing prog: 1h28m40.466406366s
Simplifying prog options: 16m20.367781997s
Extracting C: 5m6.919018659s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
single: executing 1 programs separately with timeout 30s
testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route-bpf$PROG_LOAD
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)
bpf$PROG_LOAD(0x5, 0x0, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 1m40s
testing program (duration=1m40s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route-bpf$PROG_LOAD
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)
bpf$PROG_LOAD(0x5, 0x0, 0x0)

program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route-bpf$PROG_LOAD
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)
bpf$PROG_LOAD(0x5, 0x0, 0x0)

program crashed: unregister_netdevice: waiting for DEV to become free
single: successfully extracted reproducer
found reproducer with 11 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-socket$nl_route-sendmsg$nl_route-socket$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
socket$nl_route(0x10, 0x3, 0x0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-socket$nl_route-sendmsg$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
sendmsg$nl_route(0xffffffffffffffff, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-socket$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
socket$nl_route(0x10, 0x3, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-bpf$TOKEN_CREATE-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
bpf$TOKEN_CREATE(0x24, 0x0, 0x0)
sendmsg$nl_route(0xffffffffffffffff, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-bpf$MAP_CREATE-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
bpf$MAP_CREATE(0x0, 0x0, 0x48)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-recvmmsg-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
recvmmsg(0xffffffffffffffff, 0x0, 0x0, 0x2, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-sendmmsg$unix-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
sendmmsg$unix(0xffffffffffffffff, 0x0, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socketpair$unix-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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}}): bpf$BPF_BTF_LOAD-socket$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
bpf$BPF_BTF_LOAD(0x12, &(0x7f0000000200)={0x0, 0x0, 0x0, 0x0, 0x1}, 0x28)
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, 0x0, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, 0x0}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={0x0}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, 0x0, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, 0x0}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={0x0, 0x30}}, 0x4090)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB], 0x30}}, 0x4090)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
simplifying guilty program options
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
validation run: crashed=true
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 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$nl_route-sendmsg$nl_route-socket$nl_route-sendmsg$nl_route
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r0, &(0x7f0000000100)={0x0, 0x0, &(0x7f00000000c0)={&(0x7f0000000140)=@ipv6_newnexthop={0x1c, 0x68, 0x5fb9a818fb7378e9, 0x0, 0x0, {}, [@NHA_BLACKHOLE={0x4}]}, 0x1c}}, 0x0)
r1 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route(r1, &(0x7f0000000180)={0x0, 0x0, &(0x7f0000000780)={&(0x7f0000000380)=ANY=[@ANYBLOB="300000001800dd8d000000000000000002000000000000060000000008001e0002"], 0x30}}, 0x4090)

program crashed: unregister_netdevice: waiting for DEV to become free
validation run: crashed=true
reproducing took 2h5m46.772327859s
repro crashed as (corrupted=false):
unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: netdev@ffff88803a65e618 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4412 [inline]
     netdev_get_by_index+0x7c/0xb0 net/core/dev.c:1008
     fib6_nh_init+0x791/0x1fb0 net/ipv6/route.c:3590
     nh_create_ipv6 net/ipv4/nexthop.c:2875 [inline]
     nexthop_create net/ipv4/nexthop.c:2926 [inline]
     nexthop_add net/ipv4/nexthop.c:2963 [inline]
     rtm_new_nexthop+0x244b/0x87d0 net/ipv4/nexthop.c:3277
     rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6958
     netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1894
     sock_sendmsg_nosec net/socket.c:727 [inline]
     __sock_sendmsg net/socket.c:742 [inline]
     ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592
     ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
     __sys_sendmsg+0x16d/0x220 net/socket.c:2678
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f


final repro crashed as (corrupted=false):
unregister_netdevice: waiting for lo to become free. Usage count = 2
ref_tracker: netdev@ffff88803a65e618 has 1/1 users at
     __netdev_tracker_alloc include/linux/netdevice.h:4400 [inline]
     netdev_tracker_alloc include/linux/netdevice.h:4412 [inline]
     netdev_get_by_index+0x7c/0xb0 net/core/dev.c:1008
     fib6_nh_init+0x791/0x1fb0 net/ipv6/route.c:3590
     nh_create_ipv6 net/ipv4/nexthop.c:2875 [inline]
     nexthop_create net/ipv4/nexthop.c:2926 [inline]
     nexthop_add net/ipv4/nexthop.c:2963 [inline]
     rtm_new_nexthop+0x244b/0x87d0 net/ipv4/nexthop.c:3277
     rtnetlink_rcv_msg+0x95e/0xe90 net/core/rtnetlink.c:6958
     netlink_rcv_skb+0x158/0x420 net/netlink/af_netlink.c:2550
     netlink_unicast_kernel net/netlink/af_netlink.c:1318 [inline]
     netlink_unicast+0x5aa/0x870 net/netlink/af_netlink.c:1344
     netlink_sendmsg+0x8c8/0xdd0 net/netlink/af_netlink.c:1894
     sock_sendmsg_nosec net/socket.c:727 [inline]
     __sock_sendmsg net/socket.c:742 [inline]
     ____sys_sendmsg+0xa5d/0xc30 net/socket.c:2592
     ___sys_sendmsg+0x134/0x1d0 net/socket.c:2646
     __sys_sendmsg+0x16d/0x220 net/socket.c:2678
     do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
     do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
     entry_SYSCALL_64_after_hwframe+0x77/0x7f