Extracting prog: 4m18.810941808s Minimizing prog: 41m27.177876874s Simplifying prog options: 0s Extracting C: 46.436499217s Simplifying C: 8m27.303294439s 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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r1, 0x4c06, r0) 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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r1, 0x4c06, r0) 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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) 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$sysfs-syz_open_dev$loop-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CHANGE_FD(r1, 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}}): openat$sysfs-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) ioctl$LOOP_CONFIGURE(0xffffffffffffffff, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$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$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r0, 0x4c0a, &(0x7f00000002c0)={0xffffffffffffffff, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r0, 0x4c06, 0xffffffffffffffff) program crashed: lost connection to test machine suppressed program crash: lost connection to test machine 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$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, 0x0, 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r1, 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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(0x0, 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r1, 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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, 0x0) ioctl$LOOP_CHANGE_FD(r1, 0x4c06, r0) 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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r1, 0x4c06, r0) 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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r1, 0x4c06, r0) 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}}): openat$sysfs-syz_open_dev$loop-ioctl$LOOP_CONFIGURE-ioctl$LOOP_CHANGE_FD detailed listing: executing program 0: r0 = openat$sysfs(0xffffffffffffff9c, &(0x7f0000000140)='/sys/kernel/address_bits', 0x41180, 0x142) r1 = syz_open_dev$loop(&(0x7f0000000100), 0x18bdb, 0x325967a866143452) ioctl$LOOP_CONFIGURE(r1, 0x4c0a, &(0x7f00000002c0)={r0, 0x0, {0x2a00, 0x80010000, 0x0, 0x2, 0x0, 0x0, 0x0, 0x14, 0xd, "fee8a2ab78fc979fd1e00d960720000001000000000000000000007efff1000040000000000000289f0e2a00000000000001000000000000000000e5ff00", "2809e8d0e1773b6b172d4295d9a93c527d3d458dd499280800", "f4bd000000801900", [0x8, 0xffffffff9673e35d]}}) ioctl$LOOP_CHANGE_FD(r1, 0x4c06, r0) program crashed: possible deadlock in kernfs_iop_getattr validation run: crashed=true reproducing took 59m22.226686053s repro crashed as (corrupted=false): Dev loop9: unable to read RDB block 7 loop9: unable to read partition table loop9: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop9 (þ被xü—ŸÑà– ) failed (rc=-5) ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.17/5868 is trying to acquire lock: ffff88801c2b32c0 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192 but task is already holding lock: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:590 [inline] ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1541 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+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:2045 loop_init+0xd7/0x160 drivers/block/loop.c:2284 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x10a/0x1a0 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x29d/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 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:4332 [inline] fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4346 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:4305 [inline] do_open fs/namei.c:4704 [inline] path_openat+0x3009/0x3850 fs/namei.c:4859 do_file_open+0x23e/0x4a0 fs/namei.c:4888 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+0x1520/0x2ce0 kernel/locking/lockdep.c:5239 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870 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:459 [inline] loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:512 loop_change_fd drivers/block/loop.c:592 [inline] lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1541 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)#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.0.17/5868: #0: ffff8880274ee498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_global_lock_killable drivers/block/loop.c:118 [inline] #0: ffff8880274ee498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_change_fd drivers/block/loop.c:557 [inline] #0: ffff8880274ee498 (&lo->lo_mutex){+.+.}-{4:4}, at: lo_ioctl+0x14d8/0x1fe0 drivers/block/loop.c:1541 #1: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] #1: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:590 [inline] #1: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1541 #2: ffff888027506fa0 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] #2: ffff888027506fa0 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: loop_change_fd drivers/block/loop.c:590 [inline] #2: ffff888027506fa0 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1541 stack backtrace: CPU: 1 UID: 0 PID: 5868 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: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2045 check_noncircular+0x12e/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+0x1520/0x2ce0 kernel/locking/lockdep.c:5239 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870 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:459 [inline] loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:512 loop_change_fd drivers/block/loop.c:592 [inline] lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1541 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: 0033:0x7fe39d65de59 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:00007fffafd296a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe39d8e5fa0 RCX: 00007fe39d65de59 RDX: 0000000000000003 RSI: 0000000000004c06 RDI: 0000000000000004 RBP: 00007fe39d6f3e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe39d8e5fac R14: 00007fe39d8e5fa0 R15: 00007fe39d8e5fa0 Dev loop9: unable to read RDB block 7 loop9: unable to read partition table loop9: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop9 (þ被xü—ŸÑà– ) failed (rc=-5) final repro crashed as (corrupted=false): Dev loop9: unable to read RDB block 7 loop9: unable to read partition table loop9: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop9 (þ被xü—ŸÑà– ) failed (rc=-5) ====================================================== WARNING: possible circular locking dependency detected syzkaller #0 Not tainted ------------------------------------------------------ syz.0.17/5868 is trying to acquire lock: ffff88801c2b32c0 (&root->kernfs_iattr_rwsem){++++}-{4:4}, at: kernfs_iop_getattr+0x9e/0x450 fs/kernfs/inode.c:192 but task is already holding lock: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:590 [inline] ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1541 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+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:2045 loop_init+0xd7/0x160 drivers/block/loop.c:2284 do_one_initcall+0x250/0x870 init/main.c:1347 do_initcall_level+0x10a/0x1a0 init/main.c:1409 do_initcalls+0x59/0xa0 init/main.c:1425 kernel_init_freeable+0x29d/0x3e0 init/main.c:1658 kernel_init+0x1d/0x1d0 init/main.c:1548 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:4332 [inline] fs_reclaim_acquire+0x71/0x100 mm/page_alloc.c:4346 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:4305 [inline] do_open fs/namei.c:4704 [inline] path_openat+0x3009/0x3850 fs/namei.c:4859 do_file_open+0x23e/0x4a0 fs/namei.c:4888 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+0x1520/0x2ce0 kernel/locking/lockdep.c:5239 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870 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:459 [inline] loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:512 loop_change_fd drivers/block/loop.c:592 [inline] lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1541 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)#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.0.17/5868: #0: ffff8880274ee498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_global_lock_killable drivers/block/loop.c:118 [inline] #0: ffff8880274ee498 (&lo->lo_mutex){+.+.}-{4:4}, at: loop_change_fd drivers/block/loop.c:557 [inline] #0: ffff8880274ee498 (&lo->lo_mutex){+.+.}-{4:4}, at: lo_ioctl+0x14d8/0x1fe0 drivers/block/loop.c:1541 #1: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] #1: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: loop_change_fd drivers/block/loop.c:590 [inline] #1: ffff888027506f68 (&q->q_usage_counter(io)#26){++++}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1541 #2: ffff888027506fa0 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: blk_mq_freeze_queue include/linux/blk-mq.h:956 [inline] #2: ffff888027506fa0 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: loop_change_fd drivers/block/loop.c:590 [inline] #2: ffff888027506fa0 (&q->q_usage_counter(queue)#10){+.+.}-{0:0}, at: lo_ioctl+0x1a7d/0x1fe0 drivers/block/loop.c:1541 stack backtrace: CPU: 1 UID: 0 PID: 5868 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: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_circular_bug+0x2e1/0x300 kernel/locking/lockdep.c:2045 check_noncircular+0x12e/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+0x1520/0x2ce0 kernel/locking/lockdep.c:5239 lock_acquire+0x106/0x350 kernel/locking/lockdep.c:5870 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:459 [inline] loop_assign_backing_file+0x286/0x4c0 drivers/block/loop.c:512 loop_change_fd drivers/block/loop.c:592 [inline] lo_ioctl+0x1af1/0x1fe0 drivers/block/loop.c:1541 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: 0033:0x7fe39d65de59 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:00007fffafd296a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 00007fe39d8e5fa0 RCX: 00007fe39d65de59 RDX: 0000000000000003 RSI: 0000000000004c06 RDI: 0000000000000004 RBP: 00007fe39d6f3e6f R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe39d8e5fac R14: 00007fe39d8e5fa0 R15: 00007fe39d8e5fa0 Dev loop9: unable to read RDB block 7 loop9: unable to read partition table loop9: partition table beyond EOD, truncated loop_reread_partitions: partition scan of loop9 (þ被xü—ŸÑà– ) failed (rc=-5)