Extracting prog: 1m42.34025686s
Minimizing prog: 11m41.180019042s
Simplifying prog options: 0s
Extracting C: 30.57534403s
Simplifying C: 10m28.465279891s


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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program crashed: possible deadlock in kernfs_iop_getattr
program crashed: possible deadlock in kernfs_iop_getattr
single: successfully extracted reproducer
found reproducer with 8 syscalls
minimizing guilty program
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE
detailed listing:
executing program 0:
syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r0 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r1 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r2 = openat$cgroup_ro(r0, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r2, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r1 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r2 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
ioctl$LOOP_CONFIGURE(r2, 0x4c0a, &(0x7f00000002c0)={0xffffffffffffffff, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(0xffffffffffffffff, 0x4c0a, &(0x7f00000002c0)={r3, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r3 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r2, 0x4c0a, &(0x7f00000002c0)={r3, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, 0xffffffffffffffff)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r2 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r3 = openat$cgroup_ro(0xffffffffffffffff, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r2, 0x4c0a, &(0x7f00000002c0)={r3, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
chdir(&(0x7f0000000480)='./cgroup\x00')
r0 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r1 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r2 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r3 = openat$cgroup_ro(r0, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r2, 0x4c0a, &(0x7f00000002c0)={r3, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(0xffffffffffffffff, 0x4c06, r1)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(0x0, 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, 0x0, 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(0x0, 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, 0x0, 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
testing program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, 0x0)
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
extracting C reproducer
testing compiled C program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
simplifying C reproducer
testing compiled C program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program did not crash
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false 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:true Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program did not crash
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program did not crash
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false 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}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:true UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
validation run: crashed=false
testing program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program did not crash
validation run: crashed=false
testing program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program crashed: possible deadlock in kernfs_iop_getattr
validation run: crashed=true
testing program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program crashed: possible deadlock in kernfs_iop_getattr
validation run: crashed=true
testing program (duration=32.425828426s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:false NetDevices:false NetReset:false Cgroups:true BinfmtMisc:false CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:false VhciInjection:false Wifi:false IEEE802154:false Sysctl:false Swap:false UseTmpDir:true HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-chdir-openat-openat$cgroup_ro-syz_open_dev$loop-openat$cgroup_ro-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
chdir(&(0x7f0000000480)='./cgroup\x00')
r1 = openat(0xffffffffffffff9c, &(0x7f0000000280)='.\x00', 0x0, 0x0)
r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
r3 = syz_open_dev$loop(&(0x7f0000000100), 0xd79, 0x0)
r4 = openat$cgroup_ro(r1, &(0x7f0000000140)='cgroup.stat\x00', 0x275a, 0x0)
ioctl$LOOP_CONFIGURE(r3, 0x4c0a, &(0x7f00000002c0)={r4, 0x0, {0x2a00, 0x80010000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x13, 0x1c, "fee8a2ab78fcffffffffffffff2000b8785d960000000000000000000000000f00000000000100000000000000000000000000000200", "2809e897bdb2128bfc82525edd665240f45f819e01982861ac0000000000000000001100", "90be8b1c551265406c7f306003d8a0f4bd00", [0x20]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r2)

program crashed: possible deadlock in kernfs_iop_getattr
validation run: crashed=true
reproducing took 30m20.244632204s
repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/6095 is trying to acquire lock:
ffff88801c68fa20 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_iop_getattr+0x9c/0xf0 fs/kernfs/inode.c:193

but task is already holding lock:
ffff88802657cca0 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:206

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&q->q_usage_counter(io)#26){++++}-{0:0}:
       blk_alloc_queue+0x610/0x750 block/blk-core.c:461
       blk_mq_alloc_queue+0x172/0x280 block/blk-mq.c:4415
       __blk_mq_alloc_disk+0x29/0x120 block/blk-mq.c:4462
       loop_add+0x490/0xb70 drivers/block/loop.c:2050
       loop_init+0x164/0x270 drivers/block/loop.c:2285
       do_one_initcall+0x123/0x680 init/main.c:1378
       do_initcall_level init/main.c:1440 [inline]
       do_initcalls init/main.c:1456 [inline]
       do_basic_setup init/main.c:1475 [inline]
       kernel_init_freeable+0x5c8/0x920 init/main.c:1688
       kernel_init+0x1c/0x2b0 init/main.c:1578
       ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:4301 [inline]
       fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:4315
       might_alloc include/linux/sched/mm.h:317 [inline]
       slab_pre_alloc_hook mm/slub.c:4904 [inline]
       slab_alloc_node mm/slub.c:5239 [inline]
       kmem_cache_alloc_noprof+0x5b/0x770 mm/slub.c:5270
       __kernfs_iattrs+0x124/0x3e0 fs/kernfs/inode.c:36
       kernfs_iattrs fs/kernfs/inode.c:61 [inline]
       __kernfs_setattr+0x4d/0x3c0 fs/kernfs/inode.c:74
       kernfs_iop_setattr+0xda/0x120 fs/kernfs/inode.c:128
       notify_change+0x6d2/0x1290 fs/attr.c:546
       do_truncate+0x1d7/0x230 fs/open.c:68
       handle_truncate fs/namei.c:4235 [inline]
       do_open fs/namei.c:4632 [inline]
       path_openat+0x2a1a/0x3140 fs/namei.c:4787
       do_filp_open+0x20b/0x470 fs/namei.c:4814
       do_sys_openat2+0x11f/0x280 fs/open.c:1430
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_openat fs/open.c:1452 [inline]
       __se_sys_openat fs/open.c:1447 [inline]
       __x64_sys_openat+0x174/0x210 fs/open.c:1447
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&root->kernfs_iattr_rwsem){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
       down_read+0x9b/0x460 kernel/locking/rwsem.c:1537
       kernfs_iop_getattr+0x9c/0xf0 fs/kernfs/inode.c:193
       vfs_getattr_nosec+0x2ac/0x430 fs/stat.c:213
       vfs_getattr+0x4a/0x60 fs/stat.c:262
       loop_query_min_dio_size.isra.0+0x117/0x250 drivers/block/loop.c:464
       loop_assign_backing_file drivers/block/loop.c:517 [inline]
       loop_change_fd drivers/block/loop.c:597 [inline]
       lo_ioctl+0x1430/0x1cb0 drivers/block/loop.c:1546
       blkdev_ioctl+0x5b0/0x6e0 block/ioctl.c:791
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:597 [inline]
       __se_sys_ioctl fs/ioctl.c:583 [inline]
       __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &root->kernfs_iattr_rwsem --> fs_reclaim --> &q->q_usage_counter(io)#26

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&q->q_usage_counter(io)#26);
                               lock(fs_reclaim);
                               lock(&q->q_usage_counter(io)#26);
  rlock(&root->kernfs_iattr_rwsem);

 *** DEADLOCK ***

3 locks held by syz.0.17/6095:
 #0: ffff888102f96448 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_global_lock_killable+0x30/0xb0 drivers/block/loop.c:118
 #1: ffff88802657cca0 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:206
 #2: ffff88802657ccd8 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:206

stack backtrace:
CPU: 2 UID: 0 PID: 6095 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~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x340 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
 down_read+0x9b/0x460 kernel/locking/rwsem.c:1537
 kernfs_iop_getattr+0x9c/0xf0 fs/kernfs/inode.c:193
 vfs_getattr_nosec+0x2ac/0x430 fs/stat.c:213
 vfs_getattr+0x4a/0x60 fs/stat.c:262
 loop_query_min_dio_size.isra.0+0x117/0x250 drivers/block/loop.c:464
 loop_assign_backing_file drivers/block/loop.c:517 [inline]
 loop_change_fd drivers/block/loop.c:597 [inline]
 lo_ioctl+0x1430/0x1cb0 drivers/block/loop.c:1546
 blkdev_ioctl+0x5b0/0x6e0 block/ioctl.c:791
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99bd18f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeb9539e28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f99bd3e5fa0 RCX: 00007f99bd18f7c9
RDX: 0000000000000005 RSI: 0000000000004c06 RDI: 0000000000000003
RBP: 00007f99bd213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f99bd3e5fa0 R14: 00007f99bd3e5fa0 R15: 0000000000000003
 </TASK>

final repro crashed as (corrupted=false):
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/6095 is trying to acquire lock:
ffff88801c68fa20 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_iop_getattr+0x9c/0xf0 fs/kernfs/inode.c:193

but task is already holding lock:
ffff88802657cca0 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:206

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&q->q_usage_counter(io)#26){++++}-{0:0}:
       blk_alloc_queue+0x610/0x750 block/blk-core.c:461
       blk_mq_alloc_queue+0x172/0x280 block/blk-mq.c:4415
       __blk_mq_alloc_disk+0x29/0x120 block/blk-mq.c:4462
       loop_add+0x490/0xb70 drivers/block/loop.c:2050
       loop_init+0x164/0x270 drivers/block/loop.c:2285
       do_one_initcall+0x123/0x680 init/main.c:1378
       do_initcall_level init/main.c:1440 [inline]
       do_initcalls init/main.c:1456 [inline]
       do_basic_setup init/main.c:1475 [inline]
       kernel_init_freeable+0x5c8/0x920 init/main.c:1688
       kernel_init+0x1c/0x2b0 init/main.c:1578
       ret_from_fork+0x983/0xb10 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:4301 [inline]
       fs_reclaim_acquire+0x102/0x150 mm/page_alloc.c:4315
       might_alloc include/linux/sched/mm.h:317 [inline]
       slab_pre_alloc_hook mm/slub.c:4904 [inline]
       slab_alloc_node mm/slub.c:5239 [inline]
       kmem_cache_alloc_noprof+0x5b/0x770 mm/slub.c:5270
       __kernfs_iattrs+0x124/0x3e0 fs/kernfs/inode.c:36
       kernfs_iattrs fs/kernfs/inode.c:61 [inline]
       __kernfs_setattr+0x4d/0x3c0 fs/kernfs/inode.c:74
       kernfs_iop_setattr+0xda/0x120 fs/kernfs/inode.c:128
       notify_change+0x6d2/0x1290 fs/attr.c:546
       do_truncate+0x1d7/0x230 fs/open.c:68
       handle_truncate fs/namei.c:4235 [inline]
       do_open fs/namei.c:4632 [inline]
       path_openat+0x2a1a/0x3140 fs/namei.c:4787
       do_filp_open+0x20b/0x470 fs/namei.c:4814
       do_sys_openat2+0x11f/0x280 fs/open.c:1430
       do_sys_open fs/open.c:1436 [inline]
       __do_sys_openat fs/open.c:1452 [inline]
       __se_sys_openat fs/open.c:1447 [inline]
       __x64_sys_openat+0x174/0x210 fs/open.c:1447
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

-> #0 (&root->kernfs_iattr_rwsem){++++}-{4:4}:
       check_prev_add kernel/locking/lockdep.c:3165 [inline]
       check_prevs_add kernel/locking/lockdep.c:3284 [inline]
       validate_chain kernel/locking/lockdep.c:3908 [inline]
       __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237
       lock_acquire kernel/locking/lockdep.c:5868 [inline]
       lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
       down_read+0x9b/0x460 kernel/locking/rwsem.c:1537
       kernfs_iop_getattr+0x9c/0xf0 fs/kernfs/inode.c:193
       vfs_getattr_nosec+0x2ac/0x430 fs/stat.c:213
       vfs_getattr+0x4a/0x60 fs/stat.c:262
       loop_query_min_dio_size.isra.0+0x117/0x250 drivers/block/loop.c:464
       loop_assign_backing_file drivers/block/loop.c:517 [inline]
       loop_change_fd drivers/block/loop.c:597 [inline]
       lo_ioctl+0x1430/0x1cb0 drivers/block/loop.c:1546
       blkdev_ioctl+0x5b0/0x6e0 block/ioctl.c:791
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:597 [inline]
       __se_sys_ioctl fs/ioctl.c:583 [inline]
       __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
       entry_SYSCALL_64_after_hwframe+0x77/0x7f

other info that might help us debug this:

Chain exists of:
  &root->kernfs_iattr_rwsem --> fs_reclaim --> &q->q_usage_counter(io)#26

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&q->q_usage_counter(io)#26);
                               lock(fs_reclaim);
                               lock(&q->q_usage_counter(io)#26);
  rlock(&root->kernfs_iattr_rwsem);

 *** DEADLOCK ***

3 locks held by syz.0.17/6095:
 #0: ffff888102f96448 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_global_lock_killable+0x30/0xb0 drivers/block/loop.c:118
 #1: ffff88802657cca0 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:206
 #2: ffff88802657ccd8 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: blk_mq_freeze_queue_nomemsave+0x15/0x20 block/blk-mq.c:206

stack backtrace:
CPU: 2 UID: 0 PID: 6095 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~bpo12+1 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x116/0x1f0 lib/dump_stack.c:120
 print_circular_bug+0x275/0x340 kernel/locking/lockdep.c:2043
 check_noncircular+0x146/0x160 kernel/locking/lockdep.c:2175
 check_prev_add kernel/locking/lockdep.c:3165 [inline]
 check_prevs_add kernel/locking/lockdep.c:3284 [inline]
 validate_chain kernel/locking/lockdep.c:3908 [inline]
 __lock_acquire+0x1669/0x2890 kernel/locking/lockdep.c:5237
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x179/0x330 kernel/locking/lockdep.c:5825
 down_read+0x9b/0x460 kernel/locking/rwsem.c:1537
 kernfs_iop_getattr+0x9c/0xf0 fs/kernfs/inode.c:193
 vfs_getattr_nosec+0x2ac/0x430 fs/stat.c:213
 vfs_getattr+0x4a/0x60 fs/stat.c:262
 loop_query_min_dio_size.isra.0+0x117/0x250 drivers/block/loop.c:464
 loop_assign_backing_file drivers/block/loop.c:517 [inline]
 loop_change_fd drivers/block/loop.c:597 [inline]
 lo_ioctl+0x1430/0x1cb0 drivers/block/loop.c:1546
 blkdev_ioctl+0x5b0/0x6e0 block/ioctl.c:791
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl fs/ioctl.c:583 [inline]
 __x64_sys_ioctl+0x18e/0x210 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xcd/0xf80 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f99bd18f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffeb9539e28 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f99bd3e5fa0 RCX: 00007f99bd18f7c9
RDX: 0000000000000005 RSI: 0000000000004c06 RDI: 0000000000000003
RBP: 00007f99bd213f91 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f99bd3e5fa0 R14: 00007f99bd3e5fa0 R15: 0000000000000003
 </TASK>