Extracting prog: 6m14.235826656s
Minimizing prog: 1h23m12.749175853s
Simplifying prog options: 0s
Extracting C: 2m41.308519068s
Simplifying C: 23m24.070284498s


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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program crashed: INFO: task hung in iterate_supers
program crashed: INFO: task hung in iterate_supers
single: successfully extracted reproducer
found reproducer with 7 syscalls
minimizing guilty program
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={0x0, <r0=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, 0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
write$P9_RVERSION(r0, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r0, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000c00)={0x0, <r0=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {}, 0x2c, {'wfdno', 0x3d, r0}})
write$P9_RVERSION(0xffffffffffffffff, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(0xffffffffffffffff, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(0x0, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r0=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {}, 0x2c, {'wfdno', 0x3d, r0}})
write$P9_RVERSION(0xffffffffffffffff, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(0xffffffffffffffff, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(0x0, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, 0x0, 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, 0x0, &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', 0x0, 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={0x0, <r0=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, 0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, 0x0)
write$P9_RVERSION(r0, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r0, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, 0x0, 0x0)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
testing program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, 0x0, 0x0)
sync()

program did not crash
extracting C reproducer
testing compiled C program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
program crashed: INFO: task hung in iterate_supers
simplifying C reproducer
testing compiled C program (duration=5m9.594595654s, {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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing compiled C program (duration=5m9.594595654s, {Threaded:true 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: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}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
program crashed: INFO: task hung in iterate_supers
testing compiled C program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
program crashed: INFO: task hung in iterate_supers
testing compiled C program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
program crashed: INFO: task hung in iterate_supers
testing compiled C program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing compiled C program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
program crashed: no output from test machine
a never seen crash title: no output from test machine, ignore
testing program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program did not crash
validation run: crashed=false
testing program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program crashed: INFO: task hung in iterate_supers
validation run: crashed=true
testing program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program crashed: INFO: task hung in iterate_supers
validation run: crashed=true
testing program (duration=5m9.594595654s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): pipe2$9p-pipe2$9p-mkdirat-mount$9p_fd-write$P9_RVERSION-write$P9_RGETATTR-sync
detailed listing:
executing program 0:
pipe2$9p(&(0x7f0000000280)={<r0=>0x0, <r1=>0x0}, 0x0) (rerun: 32)
pipe2$9p(&(0x7f0000000c00)={0x0, <r2=>0x0}, 0x0)
mkdirat(0xffffffffffffff9c, &(0x7f0000000c40)='./mnt\x00', 0x1ff)
mount$9p_fd(0x0, &(0x7f0000000c80)='./mnt\x00', &(0x7f0000000cc0), 0x0, &(0x7f0000000d00)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r2}})
write$P9_RVERSION(r1, &(0x7f0000000d40)={0x15, 0x65, 0xffff, 0x42000, 0x8, '9P2000.L'}, 0x15)
write$P9_RGETATTR(r1, &(0x7f0000000d80)={0xa0, 0x19, 0x0, {0x38b5, {0x40, 0x2, 0x3}, 0x40, 0x0, 0xffffffffffffffff, 0x0, 0xae, 0xa, 0x4, 0x8, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xffffffffffffffff, 0x7fffffffffffffff, 0xfffffffffffffffc, 0x3}}, 0xa0)
sync()

program crashed: INFO: task hung in iterate_supers
validation run: crashed=true
reproducing took 2h13m5.218811653s
repro crashed as (corrupted=false):
INFO: task syz.5.49:496 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.49        state:D stack:0     pid:496   tgid:494   ppid:490    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6131 [inline]
 __schedule+0x16e0/0x2380 kernel/sched/core.c:8005
 __schedule_loop kernel/sched/core.c:8080 [inline]
 schedule+0xc1/0x170 kernel/sched/core.c:8095
 super_lock+0x168/0x330 fs/super.c:117
 super_lock_shared fs/super.c:142 [inline]
 iterate_supers+0x86/0x570 fs/super.c:937
 ksys_sync+0xa1/0x170 fs/sync.c:103
 __ia32_sys_sync+0x12/0x20 fs/sync.c:114
 x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f60839a94d9
RSP: 002b:00007f6084845028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f6083c26090 RCX: 00007f60839a94d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f6083c26090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6083c26128 R14: 00007f6083c26090 R15: 00007fff9149f478
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 4c932c043eb01f9e3eebd51d42a946ef7c91072c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:114
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 4c932c043eb01f9e3eebd51d42a946ef7c91072c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:116
Code: cc cc cc cc cc cc cc b8 19 cc 06 8e 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 79 3c 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffffff87c07da0 EFLAGS: 000002c2
RAX: ffff8881f6c00000 RBX: ffffffff87c156c0 RCX: ffffffff85aae53d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000062d9c
RBP: ffffffff87c07da0 R08: ffff8881f6c396fb R09: 1ffff1103ed872df
R10: dffffc0000000000 R11: ffffed103ed872e0 R12: 0000000000000000
R13: 1ffffffff0f82ad8 R14: dffffc0000000000 R15: ffffffff886dda28
FS:  0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566f114e8 CR3: 000000010b7f6000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:-1 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:754
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
 default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:193 [inline]
 do_idle+0x1df/0x570 kernel/sched/idle.c:346
 cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
 rest_init+0x10b/0x130 init/main.c:760
 start_kernel+0x46a/0x4bb init/main.c:1242
 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
 common_startup_64+0x13b/0x157
 </TASK>

final repro crashed as (corrupted=false):
INFO: task syz.5.49:496 blocked for more than 122 seconds.
      Not tainted syzkaller #0
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.
task:syz.5.49        state:D stack:0     pid:496   tgid:494   ppid:490    flags:0x00004004
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:6131 [inline]
 __schedule+0x16e0/0x2380 kernel/sched/core.c:8005
 __schedule_loop kernel/sched/core.c:8080 [inline]
 schedule+0xc1/0x170 kernel/sched/core.c:8095
 super_lock+0x168/0x330 fs/super.c:117
 super_lock_shared fs/super.c:142 [inline]
 iterate_supers+0x86/0x570 fs/super.c:937
 ksys_sync+0xa1/0x170 fs/sync.c:103
 __ia32_sys_sync+0x12/0x20 fs/sync.c:114
 x64_sys_call+0x2a58/0x2ee0 arch/x86/include/generated/asm/syscalls_64.h:163
 do_syscall_x64 arch/x86/entry/common.c:47 [inline]
 do_syscall_64+0x57/0xf0 arch/x86/entry/common.c:78
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f60839a94d9
RSP: 002b:00007f6084845028 EFLAGS: 00000246 ORIG_RAX: 00000000000000a2
RAX: ffffffffffffffda RBX: 00007f6083c26090 RCX: 00007f60839a94d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 00007f6083c26090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f6083c26128 R14: 00007f6083c26090 R15: 00007fff9149f478
 </TASK>
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 37 Comm: khungtaskd Not tainted syzkaller #0 4c932c043eb01f9e3eebd51d42a946ef7c91072c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
Call Trace:
 <TASK>
 __dump_stack+0x21/0x30 lib/dump_stack.c:94
 dump_stack_lvl+0x140/0x1c0 lib/dump_stack.c:120
 dump_stack+0x19/0x20 lib/dump_stack.c:129
 nmi_cpu_backtrace+0x2ba/0x2d0 lib/nmi_backtrace.c:114
 nmi_trigger_cpumask_backtrace+0x142/0x2c0 lib/nmi_backtrace.c:63
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:41
 cpumask_backtrace+0x1f/0x30 lib/nmi_backtrace.c:127
 trigger_all_cpu_backtrace include/linux/nmi.h:160 [inline]
 check_hung_uninterruptible_tasks kernel/hung_task.c:267 [inline]
 watchdog+0xe45/0xf90 kernel/hung_task.c:423
 kthread+0x2c7/0x360 kernel/kthread.c:389
 ret_from_fork+0x64/0xa0 arch/x86/kernel/process.c:153
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 4c932c043eb01f9e3eebd51d42a946ef7c91072c
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/06/2026
RIP: 0010:pv_native_safe_halt+0x13/0x20 arch/x86/kernel/paravirt.c:116
Code: cc cc cc cc cc cc cc b8 19 cc 06 8e 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 79 3c 00 55 48 89 e5 fb f4 <5d> c3 cc cc cc cc cc cc cc cc cc cc cc b8 00 00 00 00 90 90 90 90
RSP: 0018:ffffffff87c07da0 EFLAGS: 000002c2
RAX: ffff8881f6c00000 RBX: ffffffff87c156c0 RCX: ffffffff85aae53d
RDX: 0000000000000001 RSI: 0000000000000004 RDI: 0000000000062d9c
RBP: ffffffff87c07da0 R08: ffff8881f6c396fb R09: 1ffff1103ed872df
R10: dffffc0000000000 R11: ffffed103ed872e0 R12: 0000000000000000
R13: 1ffffffff0f82ad8 R14: dffffc0000000000 R15: ffffffff886dda28
FS:  0000000000000000(0000) GS:ffff8881f6c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000555566f114e8 CR3: 000000010b7f6000 CR4: 00000000003526b0
Call Trace:
 <TASK>
 arch_safe_halt arch/x86/include/asm/paravirt.h:-1 [inline]
 default_idle+0x17/0x30 arch/x86/kernel/process.c:754
 arch_cpu_idle+0xd/0x20 arch/x86/kernel/process.c:791
 default_idle_call+0x3e/0x80 kernel/sched/idle.c:117
 cpuidle_idle_call kernel/sched/idle.c:193 [inline]
 do_idle+0x1df/0x570 kernel/sched/idle.c:346
 cpu_startup_entry+0x47/0x60 kernel/sched/idle.c:445
 rest_init+0x10b/0x130 init/main.c:760
 start_kernel+0x46a/0x4bb init/main.c:1242
 x86_64_start_reservations+0x2e/0x30 arch/x86/kernel/head64.c:507
 x86_64_start_kernel+0x6a/0x7b arch/x86/kernel/head64.c:488
 common_startup_64+0x13b/0x157
 </TASK>