Extracting prog: 5m5.967333826s
Minimizing prog: 1h18m42.821272533s
Simplifying prog options: 12m5.547922903s
Extracting C: 1m43.613427084s
Simplifying C: 0s


extracting reproducer from 1 programs
testing a last program of every proc
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: INFO: task hung in write_ports
single: successfully extracted reproducer
found reproducer with 6 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}}): mkdirat-mount-openat-write-socket$inet_udp
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
socket$inet_udp(0x2, 0x2, 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}}): mkdirat-mount-openat-write-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
ioctl$sock_inet_SIOCSIFFLAGS(0xffffffffffffffff, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
r0 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
write(0xffffffffffffffff, &(0x7f0000000380)='4\n\x00', 0x2)
r0 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r0, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: lost connection to test machine
suppressed program crash: lost connection to test machine
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}}): mkdirat-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, 0x0, 0x0)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380), 0x0)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, 0x0)

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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
program did not crash
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: INFO: task hung in write_ports
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
program did not crash
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: INFO: task hung in write_ports
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
program did not crash
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: INFO: task hung in write_ports
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: INFO: task hung in write_ports
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: lost connection to test machine
ignore low priority crash: lost connection to test machine
validation run: crashed=false
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}}): mkdirat-mount-openat-write-socket$inet_udp-ioctl$sock_inet_SIOCSIFFLAGS
detailed listing:
executing program 0:
mkdirat(0xffffffffffffff9c, &(0x7f0000000180)='./nfsd\x00', 0x1ff)
mount(0x0, &(0x7f0000000200)='./nfsd\x00', &(0x7f0000000240)='nfsd\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000340)='./nfsd/portlist\x00', 0x1, 0x0)
write(r0, &(0x7f0000000380)='4\n\x00', 0x2)
r1 = socket$inet_udp(0x2, 0x2, 0x0)
ioctl$sock_inet_SIOCSIFFLAGS(r1, 0x8914, &(0x7f0000000040)={'lo\x00'})

program crashed: INFO: task hung in write_ports
validation run: crashed=true
reproducing took 1h51m25.220303833s
repro crashed as (corrupted=false):
INFO: task syz.1.19:5894 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.19        state:D stack:27560 pid:5894  tgid:5894  ppid:5859   task_flags:0x400140 flags:0x00080002
Call Trac
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5521 [inline]
 __schedule+0x1b57/0x5bc0 kernel/sched/core.c:7272
 __schedule_loop kernel/sched/core.c:7349 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7364
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7421
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821
 write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
 nfsctl_transaction_write+0x10f/0x160 fs/nfsd/nfsctl.c:114
 vfs_write+0x296/0xba0 fs/read_write.c:685
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d7d79e0d9
RSP: 002b:00007fffa530ba48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3d7da25fa0 RCX: 00007f3d7d79e0d9
RDX: 0000000000000002 RSI: 0000200000000380 RDI: 0000000000000003
RBP: 00007f3d7d835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3d7da25fac R14: 00007f3d7da25fa0 R15: 00007f3d7da25fa0
 </TASK>

Showing all locks held in the system:
locks held by pr/ttyS0/16: 2, last CPU#1:
 #0: ffffffff8ee36638 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
 #0: ffffffff8ee36638 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:439 [inline]
 #0: ffffffff8ee36638 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x30/0x60 kernel/printk/printk.c:291
 #1: ffffffff9af811f8 (&port_lock_key){-.-.}-{3:3}, at: __uart_port_lock_irqsave include/linux/serial_core.h:613 [inline]
 #1: ffffffff9af811f8 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x67/0xc0 drivers/tty/serial/8250/8250_core.c:413
locks held by khungtaskd/33: 1, last CPU#0:
 #0: ffffffff8ef5ca60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ef5ca60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ef5ca60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6837
locks held by klogd/4974: 1, last CPU#0:
 #0: ffffffff8f0abf30 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:198 [inline]
 #0: ffffffff8f0abf30 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60 include/linux/srcu.h:305
locks held by getty/5375: 2, on CPU#0:
 #0: ffff88803650c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz.0.18/5840: 2, on CPU#1:
 #0: ffff888034c6c460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888034c6c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.1.19/5894: 2, on CPU#0:
 #0: ffff88807e258460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88807e258460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.2.20/5939: 2, on CPU#0:
 #0: ffff888027dee460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888027dee460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.3.21/5975: 2, on CPU#0:
 #0: ffff88807760c460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88807760c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.4.22/6018: 2, on CPU#0:
 #0: ffff8880358fe460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff8880358fe460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.5.23/6067: 2, on CPU#1:
 #0: ffff888069236460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888069236460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.6.24/6109: 2, on CPU#1:
 #0: ffff888033a80460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888033a80460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.7.25/6151: 2, on CPU#1:
 #0: ffff88802c668460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88802c668460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.8.26/6193: 2, on CPU#1:
 #0: ffff88807927e460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88807927e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.9.27/6243: 2, on CPU#0:
 #0: ffff888032d50460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888032d50460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 33 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1154 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_x2apic_icr_write arch/x86/include/asm/apic.h:229 [inline]
RIP: 0010:__x2apic_send_IPI_dest arch/x86/kernel/apic/local.h:47 [inline]
RIP: 0010:x2apic_send_IPI+0x73/0xd0 arch/x86/kernel/apic/x2apic_phys.c:50
Code: 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 75 3b 41 8b 16 0f ae f0 0f ae e8 83 fb 02 b8 00 04 00 00 0f 45 c3 b9 30 08 00 00 0f 30 <66> 90 5b 41 5c 41 5e 41 5f e9 0f 7e 7a 0a cc 48 c7 c7 60 71 db 8e
RSP: 0018:ffffc90005257878 EFLAGS: 00000006
RAX: 00000000000000fb RBX: 00000000000000fb RCX: 0000000000000830
RDX: 0000000000000000 RSI: 00000000000000fb RDI: 0000000000000000
RBP: ffffc90005257958 R08: ffffffff909ba47f R09: 1ffffffff213748f
R10: dffffc0000000000 R11: ffffffff81758120 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8880b84201d8 R15: ffffffff8e85a7d0
FS:  0000000000000000(0000) GS:ffff88812498a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055767d86fa88 CR3: 000000000ed48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_send_call_function_single_ipi arch/x86/include/asm/smp.h:95 [inline]
 send_call_function_single_ipi kernel/smp.c:127 [inline]
 __smp_call_single_queue+0x1e2/0x4a0 kernel/smp.c:468
 generic_exec_single+0x16d/0x3c0 kernel/smp.c:505
 smp_call_function_single_async+0x7d/0x110 kernel/smp.c:807
 enqueue_task+0x75/0x410 kernel/sched/core.c:2195
 activate_task kernel/sched/core.c:2235 [inline]
 ttwu_do_activate+0x1c8/0x640 kernel/sched/core.c:3835
 ttwu_queue kernel/sched/core.c:4088 [inline]
 try_to_wake_up+0x821/0x14d0 kernel/sched/core.c:4426
 process_one_work kernel/workqueue.c:3364 [inline]
 process_scheduled_works+0xa3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>

final repro crashed as (corrupted=false):
INFO: task syz.1.19:5894 blocked for more than 143 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.1.19        state:D stack:27560 pid:5894  tgid:5894  ppid:5859   task_flags:0x400140 flags:0x00080002
Call Trac
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5521 [inline]
 __schedule+0x1b57/0x5bc0 kernel/sched/core.c:7272
 __schedule_loop kernel/sched/core.c:7349 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7364
 schedule_preempt_disabled+0x13/0x30 kernel/sched/core.c:7421
 __mutex_lock_common kernel/locking/mutex.c:726 [inline]
 __mutex_lock+0x7c1/0x1550 kernel/locking/mutex.c:821
 write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
 nfsctl_transaction_write+0x10f/0x160 fs/nfsd/nfsctl.c:114
 vfs_write+0x296/0xba0 fs/read_write.c:685
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f3d7d79e0d9
RSP: 002b:00007fffa530ba48 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f3d7da25fa0 RCX: 00007f3d7d79e0d9
RDX: 0000000000000002 RSI: 0000200000000380 RDI: 0000000000000003
RBP: 00007f3d7d835024 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3d7da25fac R14: 00007f3d7da25fa0 R15: 00007f3d7da25fa0
 </TASK>

Showing all locks held in the system:
locks held by pr/ttyS0/16: 2, last CPU#1:
 #0: ffffffff8ee36638 (console_srcu){....}-{0:0}, at: rcu_try_lock_acquire include/linux/rcupdate.h:314 [inline]
 #0: ffffffff8ee36638 (console_srcu){....}-{0:0}, at: srcu_read_lock_nmisafe include/linux/srcu.h:439 [inline]
 #0: ffffffff8ee36638 (console_srcu){....}-{0:0}, at: console_srcu_read_lock+0x30/0x60 kernel/printk/printk.c:291
 #1: ffffffff9af811f8 (&port_lock_key){-.-.}-{3:3}, at: __uart_port_lock_irqsave include/linux/serial_core.h:613 [inline]
 #1: ffffffff9af811f8 (&port_lock_key){-.-.}-{3:3}, at: univ8250_console_device_lock+0x67/0xc0 drivers/tty/serial/8250/8250_core.c:413
locks held by khungtaskd/33: 1, last CPU#0:
 #0: ffffffff8ef5ca60 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:309 [inline]
 #0: ffffffff8ef5ca60 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:849 [inline]
 #0: ffffffff8ef5ca60 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6837
locks held by klogd/4974: 1, last CPU#0:
 #0: ffffffff8f0abf30 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_lock_acquire include/linux/srcu.h:198 [inline]
 #0: ffffffff8f0abf30 (remove_cache_srcu){.+.+}-{0:0}, at: srcu_read_lock+0x27/0x60 include/linux/srcu.h:305
locks held by getty/5375: 2, on CPU#0:
 #0: ffff88803650c0a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243
 #1: ffffc900032332e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45a/0x1360 drivers/tty/n_tty.c:2211
locks held by syz.0.18/5840: 2, on CPU#1:
 #0: ffff888034c6c460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888034c6c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.1.19/5894: 2, on CPU#0:
 #0: ffff88807e258460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88807e258460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.2.20/5939: 2, on CPU#0:
 #0: ffff888027dee460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888027dee460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.3.21/5975: 2, on CPU#0:
 #0: ffff88807760c460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88807760c460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.4.22/6018: 2, on CPU#0:
 #0: ffff8880358fe460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff8880358fe460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.5.23/6067: 2, on CPU#1:
 #0: ffff888069236460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888069236460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.6.24/6109: 2, on CPU#1:
 #0: ffff888033a80460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888033a80460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.7.25/6151: 2, on CPU#1:
 #0: ffff88802c668460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88802c668460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.8.26/6193: 2, on CPU#1:
 #0: ffff88807927e460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff88807927e460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867
locks held by syz.9.27/6243: 2, on CPU#0:
 #0: ffff888032d50460 (sb_writers#12){.+.+}-{0:0}, at: file_start_write include/linux/fs.h:2753 [inline]
 #0: ffff888032d50460 (sb_writers#12){.+.+}-{0:0}, at: vfs_write+0x22b/0xba0 fs/read_write.c:683
 #1: ffffffff8f29e740 (nfsd_mutex){+.+.}-{4:4}, at: write_ports+0xb5/0xd10 fs/nfsd/nfsctl.c:867

=============================================

NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 33 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:123
 nmi_trigger_cpumask_backtrace+0x17d/0x390 lib/nmi_backtrace.c:66
 trigger_all_cpu_backtrace include/linux/nmi.h:164 [inline]
 __sys_info lib/sys_info.c:157 [inline]
 sys_info+0x135/0x170 lib/sys_info.c:165
 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline]
 watchdog+0xfd7/0x1030 kernel/hung_task.c:561
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 1154 Comm: kworker/u8:8 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound nsim_dev_trap_report_work
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:37 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:139 [inline]
RIP: 0010:wrmsrq arch/x86/include/asm/msr.h:199 [inline]
RIP: 0010:native_x2apic_icr_write arch/x86/include/asm/apic.h:229 [inline]
RIP: 0010:__x2apic_send_IPI_dest arch/x86/kernel/apic/local.h:47 [inline]
RIP: 0010:x2apic_send_IPI+0x73/0xd0 arch/x86/kernel/apic/x2apic_phys.c:50
Code: 89 f0 48 c1 e8 03 42 0f b6 04 20 84 c0 75 3b 41 8b 16 0f ae f0 0f ae e8 83 fb 02 b8 00 04 00 00 0f 45 c3 b9 30 08 00 00 0f 30 <66> 90 5b 41 5c 41 5e 41 5f e9 0f 7e 7a 0a cc 48 c7 c7 60 71 db 8e
RSP: 0018:ffffc90005257878 EFLAGS: 00000006
RAX: 00000000000000fb RBX: 00000000000000fb RCX: 0000000000000830
RDX: 0000000000000000 RSI: 00000000000000fb RDI: 0000000000000000
RBP: ffffc90005257958 R08: ffffffff909ba47f R09: 1ffffffff213748f
R10: dffffc0000000000 R11: ffffffff81758120 R12: dffffc0000000000
R13: 0000000000000000 R14: ffff8880b84201d8 R15: ffffffff8e85a7d0
FS:  0000000000000000(0000) GS:ffff88812498a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000055767d86fa88 CR3: 000000000ed48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 arch_send_call_function_single_ipi arch/x86/include/asm/smp.h:95 [inline]
 send_call_function_single_ipi kernel/smp.c:127 [inline]
 __smp_call_single_queue+0x1e2/0x4a0 kernel/smp.c:468
 generic_exec_single+0x16d/0x3c0 kernel/smp.c:505
 smp_call_function_single_async+0x7d/0x110 kernel/smp.c:807
 enqueue_task+0x75/0x410 kernel/sched/core.c:2195
 activate_task kernel/sched/core.c:2235 [inline]
 ttwu_do_activate+0x1c8/0x640 kernel/sched/core.c:3835
 ttwu_queue kernel/sched/core.c:4088 [inline]
 try_to_wake_up+0x821/0x14d0 kernel/sched/core.c:4426
 process_one_work kernel/workqueue.c:3364 [inline]
 process_scheduled_works+0xa3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 kernel/kthread.c:436
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>