Extracting prog: 4m0.065494106s
Minimizing prog: 43m37.477008456s
Simplifying prog options: 0s
Extracting C: 37.822849197s
Simplifying C: 8m35.179283057s


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$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program did not crash
program did not crash
single: failed to extract reproducer
single: executing 1 programs separately with timeout 6m0s
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program crashed: possible deadlock in kernfs_iop_getattr
single: successfully extracted reproducer
found reproducer with 4 syscalls
minimizing guilty program
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={0xffffffffffffffff, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, 0xffffffffffffffff)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(0xffffffffffffffff, 0x4c0a, &(0x7f0000000080)={r0, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(0xffffffffffffffff, 0x4c06, r0)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(0x0, 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, 0x0, 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program did not crash
testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, 0x0)
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program did not crash
extracting C reproducer
testing compiled C program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
simplifying C reproducer
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=6m0s, {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$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=6m0s, {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:false Sysctl:true Swap:false UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=6m0s, {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:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=6m0s, {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:false Sysctl:true Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing compiled C program (duration=6m0s, {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:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
program crashed: possible deadlock in kernfs_iop_getattr
testing program (duration=6m0s, {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:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program crashed: possible deadlock in kernfs_iop_getattr
validation run: crashed=true
testing program (duration=6m0s, {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:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program crashed: possible deadlock in kernfs_iop_getattr
validation run: crashed=true
testing program (duration=6m0s, {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:false Sysctl:false Swap:false UseTmpDir:false HandleSegv:false Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): syz_open_dev$loop-openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD
detailed listing:
executing program 0:
r0 = syz_open_dev$loop(&(0x7f0000000240), 0x195d, 0xec4d2770249a3ef5)
r1 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000000)='/sys/power/pm_freeze_timeout', 0x82803, 0x8e)
ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f0000000080)={r1, 0x0, {0x0, 0x0, 0x0, 0x6, 0x4000000000000ffd, 0x0, 0x0, 0x1d, 0x4, "faf98317e5a1149989fc8dbe43ea6acc96e3a2503dc3bd3fe37d58128bbad0099cebdc25f5d69098c8b534464c516bdd8a0f350000e35abdb80e38f5eb010001", "32d8cc263d9e234b30c50997d3bef4cd4a5d83cdd3dfe7800b2d7b6aa54cc5001fcaed1e831fa79a0000000200", "67523760fd40f78d2cfc03d81a8ca55ba139c01802c4dae4162eb7ad3300", [0x8, 0x5]}})
ioctl$LOOP_CHANGE_FD(r0, 0x4c06, r1)

program crashed: possible deadlock in kernfs_iop_getattr
validation run: crashed=true
reproducing took 1h0m45.799615492s
repro crashed as (corrupted=false):
loop3: detected capacity change from 0 to 7
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/5837 is trying to acquire lock:
ffff88801aeaf2c0 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192

but task is already holding lock:
ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:609 [inline]
ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1560

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&q->q_usage_counter(io)#20){++++}-{0:0}:
       blk_alloc_queue+0x54c/0x690 block/blk-core.c:504
       blk_mq_alloc_queue block/blk-mq.c:4420 [inline]
       __blk_mq_alloc_disk+0x194/0x390 block/blk-mq.c:4467
       loop_add+0x480/0xb50 drivers/block/loop.c:2128
       loop_init+0xd7/0x160 drivers/block/loop.c:2367
       do_one_initcall+0x250/0x870 init/main.c:1353
       do_initcall_level+0x10a/0x1a0 init/main.c:1415
       do_initcalls+0x59/0xa0 init/main.c:1431
       kernel_init_freeable+0x29d/0x3e0 init/main.c:1666
       kernel_init+0x22/0x1d0 init/main.c:1556
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:4329 [inline]
       fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4343
       might_alloc include/linux/sched/mm.h:317 [inline]
       slab_pre_alloc_hook mm/slub.c:4559 [inline]
       slab_alloc_node mm/slub.c:4897 [inline]
       kmem_cache_alloc_noprof+0x5c/0x680 mm/slub.c:4933
       __kernfs_iattrs+0xdd/0x380 fs/kernfs/inode.c:36
       kernfs_iattrs fs/kernfs/inode.c:60 [inline]
       __kernfs_setattr fs/kernfs/inode.c:73 [inline]
       kernfs_iop_setattr+0xe6/0x3f0 fs/kernfs/inode.c:127
       notify_change+0xbb8/0xec0 fs/attr.c:556
       do_truncate+0x1c2/0x250 fs/open.c:68
       handle_truncate fs/namei.c:4300 [inline]
       do_open fs/namei.c:4698 [inline]
       path_openat+0x300d/0x3850 fs/namei.c:4857
       do_file_open+0x23e/0x4a0 fs/namei.c:4886
       do_sys_openat2+0x115/0x200 fs/open.c:1368
       do_sys_open fs/open.c:1374 [inline]
       __do_sys_openat fs/open.c:1390 [inline]
       __se_sys_openat fs/open.c:1385 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1385
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 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:3167 [inline]
       check_prevs_add kernel/locking/lockdep.c:3286 [inline]
       validate_chain kernel/locking/lockdep.c:3910 [inline]
       __lock_acquire+0x15ff/0x2e40 kernel/locking/lockdep.c:5240
       lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5892
       down_read+0x97/0x200 kernel/locking/rwsem.c:1574
       kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192
       vfs_getattr_nosec+0x2e1/0x430 fs/stat.c:213
       loop_query_min_dio_size drivers/block/loop.c:478 [inline]
       loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:531
       loop_change_fd drivers/block/loop.c:611 [inline]
       lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1560
       blkdev_ioctl+0x5e6/0x750 block/ioctl.c:797
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:597 [inline]
       __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 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)#20

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&q->q_usage_counter(io)#20);
                               lock(fs_reclaim);
                               lock(&q->q_usage_counter(io)#20);
  rlock(&root->kernfs_iattr_rwsem);

 *** DEADLOCK ***

3 locks held by syz.0.17/5837:
 #0: ffff8880266e8498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_global_lock_killable drivers/block/loop.c:137 [inline]
 #0: ffff8880266e8498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_change_fd drivers/block/loop.c:576 [inline]
 #0: ffff8880266e8498 (&lo->lo_mutex){+.+.}-{4:4}, at: lo_ioctl+0x14d8/0x1fe0 drivers/block/loop.c:1560
 #1: ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
 #1: ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:609 [inline]
 #1: ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1560
 #2: ffff8880266cdb70 (&q->q_usage_counter(queue)#4){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
 #2: ffff8880266cdb70 (&q->q_usage_counter(queue)#4){+.+.}-{0:0}, at: loop_change_fd drivers/block/loop.c:609 [inline]
 #2: ffff8880266cdb70 (&q->q_usage_counter(queue)#4){+.+.}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1560

stack backtrace:
CPU: 1 UID: 0 PID: 5837 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2045
 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2177
 check_prev_add kernel/locking/lockdep.c:3167 [inline]
 check_prevs_add kernel/locking/lockdep.c:3286 [inline]
 validate_chain kernel/locking/lockdep.c:3910 [inline]
 __lock_acquire+0x15ff/0x2e40 kernel/locking/lockdep.c:5240
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5892
 down_read+0x97/0x200 kernel/locking/rwsem.c:1574
 kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192
 vfs_getattr_nosec+0x2e1/0x430 fs/stat.c:213
 loop_query_min_dio_size drivers/block/loop.c:478 [inline]
 loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:531
 loop_change_fd drivers/block/loop.c:611 [inline]
 lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1560
 blkdev_ioctl+0x5e6/0x750 block/ioctl.c:797
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9dbeabde59
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:00007ffc0e8225b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9dbed45fa0 RCX: 00007f9dbeabde59
RDX: 0000000000000004 RSI: 0000000000004c06 RDI: 0000000000000003
RBP: 00007f9dbeb53e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9dbed45fac R14: 00007f9dbed45fa0 R15: 00007f9dbed45fa0
 </TASK>

final repro crashed as (corrupted=false):
loop3: detected capacity change from 0 to 7
======================================================
WARNING: possible circular locking dependency detected
syzkaller #0 Not tainted
------------------------------------------------------
syz.0.17/5837 is trying to acquire lock:
ffff88801aeaf2c0 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192

but task is already holding lock:
ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:609 [inline]
ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1560

which lock already depends on the new lock.


the existing dependency chain (in reverse order) is:

-> #2 (&q->q_usage_counter(io)#20){++++}-{0:0}:
       blk_alloc_queue+0x54c/0x690 block/blk-core.c:504
       blk_mq_alloc_queue block/blk-mq.c:4420 [inline]
       __blk_mq_alloc_disk+0x194/0x390 block/blk-mq.c:4467
       loop_add+0x480/0xb50 drivers/block/loop.c:2128
       loop_init+0xd7/0x160 drivers/block/loop.c:2367
       do_one_initcall+0x250/0x870 init/main.c:1353
       do_initcall_level+0x10a/0x1a0 init/main.c:1415
       do_initcalls+0x59/0xa0 init/main.c:1431
       kernel_init_freeable+0x29d/0x3e0 init/main.c:1666
       kernel_init+0x22/0x1d0 init/main.c:1556
       ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
       ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245

-> #1 (fs_reclaim){+.+.}-{0:0}:
       __fs_reclaim_acquire mm/page_alloc.c:4329 [inline]
       fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4343
       might_alloc include/linux/sched/mm.h:317 [inline]
       slab_pre_alloc_hook mm/slub.c:4559 [inline]
       slab_alloc_node mm/slub.c:4897 [inline]
       kmem_cache_alloc_noprof+0x5c/0x680 mm/slub.c:4933
       __kernfs_iattrs+0xdd/0x380 fs/kernfs/inode.c:36
       kernfs_iattrs fs/kernfs/inode.c:60 [inline]
       __kernfs_setattr fs/kernfs/inode.c:73 [inline]
       kernfs_iop_setattr+0xe6/0x3f0 fs/kernfs/inode.c:127
       notify_change+0xbb8/0xec0 fs/attr.c:556
       do_truncate+0x1c2/0x250 fs/open.c:68
       handle_truncate fs/namei.c:4300 [inline]
       do_open fs/namei.c:4698 [inline]
       path_openat+0x300d/0x3850 fs/namei.c:4857
       do_file_open+0x23e/0x4a0 fs/namei.c:4886
       do_sys_openat2+0x115/0x200 fs/open.c:1368
       do_sys_open fs/open.c:1374 [inline]
       __do_sys_openat fs/open.c:1390 [inline]
       __se_sys_openat fs/open.c:1385 [inline]
       __x64_sys_openat+0x138/0x170 fs/open.c:1385
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 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:3167 [inline]
       check_prevs_add kernel/locking/lockdep.c:3286 [inline]
       validate_chain kernel/locking/lockdep.c:3910 [inline]
       __lock_acquire+0x15ff/0x2e40 kernel/locking/lockdep.c:5240
       lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5892
       down_read+0x97/0x200 kernel/locking/rwsem.c:1574
       kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192
       vfs_getattr_nosec+0x2e1/0x430 fs/stat.c:213
       loop_query_min_dio_size drivers/block/loop.c:478 [inline]
       loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:531
       loop_change_fd drivers/block/loop.c:611 [inline]
       lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1560
       blkdev_ioctl+0x5e6/0x750 block/ioctl.c:797
       vfs_ioctl fs/ioctl.c:51 [inline]
       __do_sys_ioctl fs/ioctl.c:597 [inline]
       __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
       do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
       do_syscall_64+0x174/0x580 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)#20

 Possible unsafe locking scenario:

       CPU0                    CPU1
       ----                    ----
  lock(&q->q_usage_counter(io)#20);
                               lock(fs_reclaim);
                               lock(&q->q_usage_counter(io)#20);
  rlock(&root->kernfs_iattr_rwsem);

 *** DEADLOCK ***

3 locks held by syz.0.17/5837:
 #0: ffff8880266e8498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_global_lock_killable drivers/block/loop.c:137 [inline]
 #0: ffff8880266e8498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_change_fd drivers/block/loop.c:576 [inline]
 #0: ffff8880266e8498 (&lo->lo_mutex){+.+.}-{4:4}, at: lo_ioctl+0x14d8/0x1fe0 drivers/block/loop.c:1560
 #1: ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
 #1: ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:609 [inline]
 #1: ffff8880266cdb38 (&q->q_usage_counter(io)#20){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1560
 #2: ffff8880266cdb70 (&q->q_usage_counter(queue)#4){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline]
 #2: ffff8880266cdb70 (&q->q_usage_counter(queue)#4){+.+.}-{0:0}, at: loop_change_fd drivers/block/loop.c:609 [inline]
 #2: ffff8880266cdb70 (&q->q_usage_counter(queue)#4){+.+.}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1560

stack backtrace:
CPU: 1 UID: 0 PID: 5837 Comm: syz.0.17 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 print_circular_bug+0x2e2/0x300 kernel/locking/lockdep.c:2045
 check_noncircular+0x12f/0x150 kernel/locking/lockdep.c:2177
 check_prev_add kernel/locking/lockdep.c:3167 [inline]
 check_prevs_add kernel/locking/lockdep.c:3286 [inline]
 validate_chain kernel/locking/lockdep.c:3910 [inline]
 __lock_acquire+0x15ff/0x2e40 kernel/locking/lockdep.c:5240
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5892
 down_read+0x97/0x200 kernel/locking/rwsem.c:1574
 kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192
 vfs_getattr_nosec+0x2e1/0x430 fs/stat.c:213
 loop_query_min_dio_size drivers/block/loop.c:478 [inline]
 loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:531
 loop_change_fd drivers/block/loop.c:611 [inline]
 lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1560
 blkdev_ioctl+0x5e6/0x750 block/ioctl.c:797
 vfs_ioctl fs/ioctl.c:51 [inline]
 __do_sys_ioctl fs/ioctl.c:597 [inline]
 __se_sys_ioctl+0xff/0x170 fs/ioctl.c:583
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f9dbeabde59
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:00007ffc0e8225b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f9dbed45fa0 RCX: 00007f9dbeabde59
RDX: 0000000000000004 RSI: 0000000000004c06 RDI: 0000000000000003
RBP: 00007f9dbeb53e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9dbed45fac R14: 00007f9dbed45fa0 R15: 00007f9dbed45fa0
 </TASK>