Extracting prog: 56.294344693s
Minimizing prog: 11m45.266523294s
Simplifying prog options: 0s
Extracting C: 19.345030738s
Simplifying C: 2m52.027543735s


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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program crashed: possible deadlock in lookup_slow
single: successfully extracted reproducer
found reproducer with 10 syscalls
minimizing guilty program
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r1 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x1)
fchdir(r2)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
fsmount(r2, 0x0, 0x1)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
fchdir(0xffffffffffffffff)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
fsconfig$FSCONFIG_CMD_CREATE(0xffffffffffffffff, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(0xffffffffffffffff, 0x0, 0x1)
fchdir(r2)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x1)
fchdir(r2)
write(0xffffffffffffffff, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r1 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x1)
fchdir(r2)
write(r0, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
write(0xffffffffffffffff, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r1 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x1)
fchdir(r2)
write(r0, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(0x0, 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', 0x0, 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, 0x0, 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, 0x0, 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300), 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, 0x0, 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(0x0, 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, 0x0, 0x0)

program did not crash
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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00), 0x0)

program did not crash
extracting C reproducer
testing compiled C 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}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
simplifying C reproducer
testing compiled C program (duration=30s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:false Cgroups:false BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
testing compiled C program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in lookup_slow
testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program crashed: possible deadlock in lookup_slow
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program crashed: possible deadlock in lookup_slow
validation run: crashed=true
testing program (duration=30s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-openat-write-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000e00)='./proc_dir\x00', 0x1ff)
mount(0x0, &(0x7f0000001000)='./proc_dir\x00', &(0x7f0000001100)='proc\x00', 0x0, 0x0)
r0 = openat(0xffffffffffffff9c, &(0x7f0000001200)='./proc_dir/net/rpc/auth.unix.ip/channel\x00', 0x2, 0x0)
write(r0, &(0x7f0000001300)='nfsd 127.0.0.1 2000000000 *\n', 0x1c)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000a00)='./proc_dir/net/rpc/nfsd.export/channel\x00', 0x2, 0x0)
r2 = fsopen(&(0x7f0000000180)='proc\x00', 0x1)
fsconfig$FSCONFIG_CMD_CREATE(r2, 0x6, 0x0, 0x0, 0x0)
r3 = fsmount(r2, 0x0, 0x1)
fchdir(r3)
write(r1, &(0x7f0000000b00)='* ./export_dir 2000000000 8194 0 0 0\n', 0x25)

program crashed: possible deadlock in lookup_slow
validation run: crashed=true
reproducing took 17m22.88319578s
repro crashed as (corrupted=false):
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.17/5911 is trying to acquire lock:
ffff88803bb66b30 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
ffff88803bb66b30 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: lookup_slow+0x42/0x70 fs/namei.c:1935

but task is already holding lock:
ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write net/sunrpc/cache.c:961 [inline]
ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write_procfs+0xaa/0x170 net/sunrpc/cache.c:1561

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&sb->s_type->i_mutex_key#11);
  lock(&sb->s_type->i_mutex_key#11);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

locks held by syz.0.17/5911: 2, last CPU#2:
 #0: ffff88802dc4e460 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
 #1: ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #1: ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write net/sunrpc/cache.c:961 [inline]
 #1: ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write_procfs+0xaa/0x170 net/sunrpc/cache.c:1561

stack backtrace:
CPU: 2 UID: 0 PID: 5911 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_deadlock_bug.cold+0xbd/0xca kernel/locking/lockdep.c:3085
 check_deadlock kernel/locking/lockdep.c:3137 [inline]
 validate_chain kernel/locking/lockdep.c:3939 [inline]
 __lock_acquire+0x13f4/0x1f40 kernel/locking/lockdep.c:5288
 lock_acquire kernel/locking/lockdep.c:5942 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
 down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574
 inode_lock_shared include/linux/fs.h:1039 [inline]
 lookup_slow+0x42/0x70 fs/namei.c:1935
 walk_component fs/namei.c:2282 [inline]
 lookup_last fs/namei.c:2789 [inline]
 path_lookupat+0x5e8/0xc40 fs/namei.c:2813
 filename_lookup+0x202/0x590 fs/namei.c:2842
 kern_path+0x37/0x50 fs/namei.c:3036
 svc_export_parse+0x1fe/0x1920 fs/nfsd/export.c:1340
 cache_do_downcall+0xc3/0x130 net/sunrpc/cache.c:922
 cache_downcall net/sunrpc/cache.c:944 [inline]
 cache_write net/sunrpc/cache.c:962 [inline]
 cache_write_procfs+0xfb/0x170 net/sunrpc/cache.c:1561
 pde_write fs/proc/inode.c:330 [inline]
 proc_reg_write+0x240/0x330 fs/proc/inode.c:342
 vfs_write+0x2aa/0x1050 fs/read_write.c:685
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd0039e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdda5d73e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007efd00625fa0 RCX: 00007efd0039e159
RDX: 0000000000000025 RSI: 0000200000000b00 RDI: 0000000000000004
RBP: 00007efd0043503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd00625fac R14: 00007efd00625fa0 R15: 00007efd00625fa0
 </TASK>

final repro crashed as (corrupted=false):
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.17/5911 is trying to acquire lock:
ffff88803bb66b30 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock_shared include/linux/fs.h:1039 [inline]
ffff88803bb66b30 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: lookup_slow+0x42/0x70 fs/namei.c:1935

but task is already holding lock:
ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write net/sunrpc/cache.c:961 [inline]
ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write_procfs+0xaa/0x170 net/sunrpc/cache.c:1561

other info that might help us debug this:
 Possible unsafe locking scenario:

       CPU0
       ----
  lock(&sb->s_type->i_mutex_key#11);
  lock(&sb->s_type->i_mutex_key#11);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

locks held by syz.0.17/5911: 2, last CPU#2:
 #0: ffff88802dc4e460 (sb_writers#3){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
 #1: ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: inode_lock include/linux/fs.h:1024 [inline]
 #1: ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write net/sunrpc/cache.c:961 [inline]
 #1: ffff88803bb67038 (&sb->s_type->i_mutex_key#11){++++}-{4:4}, at: cache_write_procfs+0xaa/0x170 net/sunrpc/cache.c:1561

stack backtrace:
CPU: 2 UID: 0 PID: 5911 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 print_deadlock_bug.cold+0xbd/0xca kernel/locking/lockdep.c:3085
 check_deadlock kernel/locking/lockdep.c:3137 [inline]
 validate_chain kernel/locking/lockdep.c:3939 [inline]
 __lock_acquire+0x13f4/0x1f40 kernel/locking/lockdep.c:5288
 lock_acquire kernel/locking/lockdep.c:5942 [inline]
 lock_acquire+0x1d1/0x380 kernel/locking/lockdep.c:5899
 down_read+0x99/0x4c0 kernel/locking/rwsem.c:1574
 inode_lock_shared include/linux/fs.h:1039 [inline]
 lookup_slow+0x42/0x70 fs/namei.c:1935
 walk_component fs/namei.c:2282 [inline]
 lookup_last fs/namei.c:2789 [inline]
 path_lookupat+0x5e8/0xc40 fs/namei.c:2813
 filename_lookup+0x202/0x590 fs/namei.c:2842
 kern_path+0x37/0x50 fs/namei.c:3036
 svc_export_parse+0x1fe/0x1920 fs/nfsd/export.c:1340
 cache_do_downcall+0xc3/0x130 net/sunrpc/cache.c:922
 cache_downcall net/sunrpc/cache.c:944 [inline]
 cache_write net/sunrpc/cache.c:962 [inline]
 cache_write_procfs+0xfb/0x170 net/sunrpc/cache.c:1561
 pde_write fs/proc/inode.c:330 [inline]
 proc_reg_write+0x240/0x330 fs/proc/inode.c:342
 vfs_write+0x2aa/0x1050 fs/read_write.c:685
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline]
 do_syscall_64+0x123/0x790 arch/x86/entry/syscall_64.c:84
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7efd0039e159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffdda5d73e8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007efd00625fa0 RCX: 00007efd0039e159
RDX: 0000000000000025 RSI: 0000200000000b00 RDI: 0000000000000004
RBP: 00007efd0043503b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007efd00625fac R14: 00007efd00625fa0 R15: 00007efd00625fa0
 </TASK>