Extracting prog: 1m7.259260847s
Minimizing prog: 14m39.422630135s
Simplifying prog options: 0s
Extracting C: 21.020604994s
Simplifying C: 3m49.449305255s


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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program crashed: possible deadlock in path_openat
single: successfully extracted reproducer
found reproducer with 10 syscalls
minimizing guilty program
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r0 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r0, 0x6, 0x0, 0x0, 0x0)
r1 = fsmount(r0, 0x0, 0x0)
fchdir(r1)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
fsmount(r1, 0x0, 0x0)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
fchdir(0xffffffffffffffff)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
fsconfig$FSCONFIG_CMD_CREATE(0xffffffffffffffff, 0x6, 0x0, 0x0, 0x0)
r1 = fsmount(0xffffffffffffffff, 0x0, 0x0)
fchdir(r1)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r0, 0x6, 0x0, 0x0, 0x0)
r1 = fsmount(r0, 0x0, 0x0)
fchdir(r1)
write(0xffffffffffffffff, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(0x0, 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, 0x0, &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', 0x0, 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(0x0, 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(0x0, 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, 0x0, 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(0x0, 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, 0x0, 0x0)

program did not crash
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00), 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
simplifying C reproducer
testing compiled C program (duration=32.770089192s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
testing compiled C program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
testing compiled C program (duration=32.770089192s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
testing compiled C program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
testing compiled C program (duration=32.770089192s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
testing compiled C program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
testing compiled C program (duration=32.770089192s, {Threaded:false Repeat:false RepeatTimes:0 Procs:1 Slowdown:1 Sandbox: SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:false BinfmtMisc:false CloseFDs:false KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): mkdir-mount-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
program crashed: possible deadlock in path_openat
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program crashed: possible deadlock in path_openat
validation run: crashed=true
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program crashed: possible deadlock in path_openat
validation run: crashed=true
testing program (duration=32.770089192s, {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-mkdir-mkdir-openat-fsopen-fsconfig$FSCONFIG_CMD_CREATE-fsmount-fchdir-write
detailed listing:
executing program 0:
mkdir(&(0x7f0000000100)='my_configfs\x00', 0x1ff)
mount(0x0, &(0x7f0000000100)='my_configfs\x00', &(0x7f0000000300)='configfs\x00', 0x0, 0x0)
mkdir(&(0x7f0000000700)='my_configfs/usb_gadget/g1\x00', 0x1ff)
mkdir(&(0x7f0000000d00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0\x00', 0x1ff)
r0 = openat(0xffffffffffffff9c, &(0x7f0000000e00)='my_configfs/usb_gadget/g1/functions/mass_storage.usb0/lun.0/file\x00', 0x1, 0x0)
r1 = fsopen(&(0x7f0000000100)='configfs\x00', 0x0)
fsconfig$FSCONFIG_CMD_CREATE(r1, 0x6, 0x0, 0x0, 0x0)
r2 = fsmount(r1, 0x0, 0x0)
fchdir(r2)
write(r0, &(0x7f0000000f00)='fi', 0x2)

program crashed: possible deadlock in path_openat
validation run: crashed=true
reproducing took 21m46.121593396s
repro crashed as (corrupted=false):
Mass Storage Function, version: 2009/09/11
LUN: removable file: (no medium)
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.17/5931 is trying to acquire lock:
ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:4597 [inline]
ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: path_openat+0xad9/0x4280 fs/namei.c:4860

but task is already holding lock:
ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739

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

       CPU0
       ----
  lock(sb_writers#13);
  lock(sb_writers#13);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

4 locks held by syz.0.17/5931:
 #0: ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
 #1: ffff88803c6e8480 (&buffer->mutex){+.+.}-{4:4}, at: configfs_write_iter+0x76/0x4e0 fs/configfs/file.c:226
 #2: ffff888022ac4670 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline]
 #2: ffff888022ac4670 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x218/0x4e0 fs/configfs/file.c:229
 #3: ffff888026567120 (&common->filesem){+.+.}-{4:4}, at: fsg_store_file+0x193/0x450 drivers/usb/gadget/function/storage_common.c:452

stack backtrace:
CPU: 2 UID: 0 PID: 5931 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:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x1256/0x1a40 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
 percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 __sb_start_write include/linux/fs/super.h:19 [inline]
 sb_start_write include/linux/fs/super.h:125 [inline]
 mnt_want_write+0x6f/0x410 fs/namespace.c:494
 open_last_lookups fs/namei.c:4597 [inline]
 path_openat+0xad9/0x4280 fs/namei.c:4860
 do_file_open+0x20e/0x430 fs/namei.c:4892
 file_open_name+0x1c3/0x3e0 fs/open.c:1326
 filp_open+0x2e/0x50 fs/open.c:1343
 fsg_lun_open+0x6b/0x7b0 drivers/usb/gadget/function/storage_common.c:194
 fsg_store_file+0x1e7/0x450 drivers/usb/gadget/function/storage_common.c:455
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4dab39de99
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:00007ffcc2fe5d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4dab625fa0 RCX: 00007f4dab39de99
RDX: 0000000000000002 RSI: 0000200000000f00 RDI: 0000000000000003
RBP: 00007f4dab433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4dab625fac R14: 00007f4dab625fa0 R15: 00007f4dab625fa0
 </TASK>
mass_storage.usb0/lun.0: unable to open backing file: fi

final repro crashed as (corrupted=false):
Mass Storage Function, version: 2009/09/11
LUN: removable file: (no medium)
============================================
WARNING: possible recursive locking detected
syzkaller #0 Not tainted
--------------------------------------------
syz.0.17/5931 is trying to acquire lock:
ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: open_last_lookups fs/namei.c:4597 [inline]
ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: path_openat+0xad9/0x4280 fs/namei.c:4860

but task is already holding lock:
ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739

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

       CPU0
       ----
  lock(sb_writers#13);
  lock(sb_writers#13);

 *** DEADLOCK ***

 May be due to missing lock nesting notation

4 locks held by syz.0.17/5931:
 #0: ffff888022ef8450 (sb_writers#13){.+.+}-{0:0}, at: ksys_write+0x12a/0x250 fs/read_write.c:739
 #1: ffff88803c6e8480 (&buffer->mutex){+.+.}-{4:4}, at: configfs_write_iter+0x76/0x4e0 fs/configfs/file.c:226
 #2: ffff888022ac4670 (&p->frag_sem){.+.+}-{4:4}, at: flush_write_buffer fs/configfs/file.c:205 [inline]
 #2: ffff888022ac4670 (&p->frag_sem){.+.+}-{4:4}, at: configfs_write_iter+0x218/0x4e0 fs/configfs/file.c:229
 #3: ffff888026567120 (&common->filesem){+.+.}-{4:4}, at: fsg_store_file+0x193/0x450 drivers/usb/gadget/function/storage_common.c:452

stack backtrace:
CPU: 2 UID: 0 PID: 5931 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:3041
 check_deadlock kernel/locking/lockdep.c:3093 [inline]
 validate_chain kernel/locking/lockdep.c:3895 [inline]
 __lock_acquire+0x1256/0x1a40 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b9/0x370 kernel/locking/lockdep.c:5825
 percpu_down_read_internal include/linux/percpu-rwsem.h:53 [inline]
 percpu_down_read_freezable include/linux/percpu-rwsem.h:83 [inline]
 __sb_start_write include/linux/fs/super.h:19 [inline]
 sb_start_write include/linux/fs/super.h:125 [inline]
 mnt_want_write+0x6f/0x410 fs/namespace.c:494
 open_last_lookups fs/namei.c:4597 [inline]
 path_openat+0xad9/0x4280 fs/namei.c:4860
 do_file_open+0x20e/0x430 fs/namei.c:4892
 file_open_name+0x1c3/0x3e0 fs/open.c:1326
 filp_open+0x2e/0x50 fs/open.c:1343
 fsg_lun_open+0x6b/0x7b0 drivers/usb/gadget/function/storage_common.c:194
 fsg_store_file+0x1e7/0x450 drivers/usb/gadget/function/storage_common.c:455
 flush_write_buffer fs/configfs/file.c:207 [inline]
 configfs_write_iter+0x302/0x4e0 fs/configfs/file.c:229
 new_sync_write fs/read_write.c:595 [inline]
 vfs_write+0x6ac/0x1050 fs/read_write.c:687
 ksys_write+0x12a/0x250 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4dab39de99
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:00007ffcc2fe5d18 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4dab625fa0 RCX: 00007f4dab39de99
RDX: 0000000000000002 RSI: 0000200000000f00 RDI: 0000000000000003
RBP: 00007f4dab433eaf R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4dab625fac R14: 00007f4dab625fa0 R15: 00007f4dab625fa0
 </TASK>
mass_storage.usb0/lun.0: unable to open backing file: fi