Extracting prog: 1m12.331235474s Minimizing prog: 19m54.041481804s Simplifying prog options: 3m40.165558149s Extracting C: 28.029981176s Simplifying C: 0s extracting reproducer from 30 programs first checking the prog from the crash report single: executing 1 programs separately with timeout 30s testing program (duration=30s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-ioctl$VIDIOC_SUBSCRIBE_EVENT-syz_open_procfs-preadv-ioctl$UFFDIO_COPY-ioctl$USBDEVFS_CONTROL-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) ioctl$VIDIOC_SUBSCRIBE_EVENT(r1, 0x4020565a, 0x0) r2 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000140)='net/udplite6\x00') preadv(r2, &(0x7f0000000100)=[{&(0x7f0000000480)=""/187, 0xbb}], 0x1, 0x4c, 0x0) ioctl$UFFDIO_COPY(r2, 0xc028aa03, &(0x7f0000000000)={&(0x7f0000ffa000/0x4000)=nil, &(0x7f0000ffc000/0x1000)=nil, 0x4000, 0x2}) ioctl$USBDEVFS_CONTROL(0xffffffffffffffff, 0xc0185500, 0x0) r3 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r3, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write single: successfully extracted reproducer found reproducer with 15 syscalls minimizing guilty program testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-ioctl$VIDIOC_SUBSCRIBE_EVENT-syz_open_procfs-preadv-ioctl$UFFDIO_COPY-ioctl$USBDEVFS_CONTROL-openat$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) ioctl$VIDIOC_SUBSCRIBE_EVENT(r1, 0x4020565a, 0x0) r2 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000140)='net/udplite6\x00') preadv(r2, &(0x7f0000000100)=[{&(0x7f0000000480)=""/187, 0xbb}], 0x1, 0x4c, 0x0) ioctl$UFFDIO_COPY(r2, 0xc028aa03, &(0x7f0000000000)={&(0x7f0000ffa000/0x4000)=nil, &(0x7f0000ffc000/0x1000)=nil, 0x4000, 0x2}) ioctl$USBDEVFS_CONTROL(0xffffffffffffffff, 0xc0185500, 0x0) openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) program did not crash testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-ioctl$VIDIOC_SUBSCRIBE_EVENT-syz_open_procfs-preadv-ioctl$UFFDIO_COPY-ioctl$USBDEVFS_CONTROL-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) ioctl$VIDIOC_SUBSCRIBE_EVENT(r1, 0x4020565a, 0x0) r2 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000140)='net/udplite6\x00') preadv(r2, &(0x7f0000000100)=[{&(0x7f0000000480)=""/187, 0xbb}], 0x1, 0x4c, 0x0) ioctl$UFFDIO_COPY(r2, 0xc028aa03, &(0x7f0000000000)={&(0x7f0000ffa000/0x4000)=nil, &(0x7f0000ffc000/0x1000)=nil, 0x4000, 0x2}) ioctl$USBDEVFS_CONTROL(0xffffffffffffffff, 0xc0185500, 0x0) write$rfkill(0xffffffffffffffff, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program did not crash testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-ioctl$VIDIOC_SUBSCRIBE_EVENT-syz_open_procfs-preadv-ioctl$UFFDIO_COPY-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) ioctl$VIDIOC_SUBSCRIBE_EVENT(r1, 0x4020565a, 0x0) r2 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000140)='net/udplite6\x00') preadv(r2, &(0x7f0000000100)=[{&(0x7f0000000480)=""/187, 0xbb}], 0x1, 0x4c, 0x0) ioctl$UFFDIO_COPY(r2, 0xc028aa03, &(0x7f0000000000)={&(0x7f0000ffa000/0x4000)=nil, &(0x7f0000ffc000/0x1000)=nil, 0x4000, 0x2}) r3 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r3, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-ioctl$VIDIOC_SUBSCRIBE_EVENT-syz_open_procfs-preadv-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) ioctl$VIDIOC_SUBSCRIBE_EVENT(r1, 0x4020565a, 0x0) r2 = syz_open_procfs(0xffffffffffffffff, &(0x7f0000000140)='net/udplite6\x00') preadv(r2, &(0x7f0000000100)=[{&(0x7f0000000480)=""/187, 0xbb}], 0x1, 0x4c, 0x0) r3 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r3, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-ioctl$VIDIOC_SUBSCRIBE_EVENT-syz_open_procfs-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) ioctl$VIDIOC_SUBSCRIBE_EVENT(r1, 0x4020565a, 0x0) syz_open_procfs(0xffffffffffffffff, &(0x7f0000000140)='net/udplite6\x00') r2 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r2, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-ioctl$VIDIOC_SUBSCRIBE_EVENT-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) ioctl$VIDIOC_SUBSCRIBE_EVENT(r1, 0x4020565a, 0x0) r2 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r2, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$vimc2-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) openat$vimc2(0xffffffffffffff9c, &(0x7f00000000c0), 0x2, 0x4000) r1 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r1, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-read$msr-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) read$msr(r0, &(0x7f0000019680)=""/102392, 0x18ff8) r1 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r1, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-syz_open_dev$MSR-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) syz_open_dev$MSR(&(0x7f0000000300), 0x100040000, 0x0) r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-sched_setaffinity-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) sched_setaffinity(0x0, 0x8, &(0x7f00000002c0)=0x400000bce) r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-sched_setscheduler-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) sched_setscheduler(0x0, 0x1, &(0x7f0000000080)=0x5) r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-prlimit64-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) prlimit64(0x0, 0xe, &(0x7f0000000140)={0x9, 0x8b}, 0x0) r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-syz_open_dev$sndpcmc-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) syz_open_dev$sndpcmc(0x0, 0x0, 0x0) r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prctl$PR_SCHED_CORE-openat$rfkill-write$rfkill detailed listing: executing program 0: prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0) r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill detailed listing: executing program 0: r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill detailed listing: executing program 0: r0 = openat$rfkill(0xffffffffffffff9c, 0x0, 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program did not crash testing program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill detailed listing: executing program 0: r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, 0x0, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=49.906198533s, {Threaded:true Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill program crashed: possible deadlock in hci_dev_do_close a never seen crash title: possible deadlock in hci_dev_do_close, ignore simplifying guilty program options testing program (duration=49.906198533s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill detailed listing: executing program 0: r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write extracting C reproducer testing compiled C program (duration=49.906198533s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill program crashed: possible deadlock in hci_dev_do_close a never seen crash title: possible deadlock in hci_dev_do_close, ignore testing program (duration=49.906198533s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill detailed listing: executing program 0: r0 = openat$rfkill(0xffffffffffffff9c, &(0x7f0000000040), 0x801, 0x0) write$rfkill(r0, &(0x7f0000000080)={0x6c, 0x0, 0x3, 0x1}, 0x8) program crashed: possible deadlock in rfkill_fop_write extracting C reproducer testing compiled C program (duration=49.906198533s, {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 LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$rfkill-write$rfkill program crashed: possible deadlock in hci_dev_do_close a never seen crash title: possible deadlock in hci_dev_do_close, ignore reproducing took 25m44.303024491s repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected 5.15.172-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.15/4293 is trying to acquire lock: ffff888077b48c28 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xcf/0x1a0 kernel/workqueue.c:3090 but task is already holding lock: ffffffff8dcbe6a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a5/0x790 net/rfkill/core.c:1266 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (rfkill_global_mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 rfkill_register+0x30/0x880 net/rfkill/core.c:1045 hci_register_dev+0x4dd/0xa50 net/bluetooth/hci_core.c:3960 __vhci_create_device drivers/bluetooth/hci_vhci.c:129 [inline] vhci_create_device+0x310/0x590 drivers/bluetooth/hci_vhci.c:153 vhci_get_user drivers/bluetooth/hci_vhci.c:210 [inline] vhci_write+0x382/0x430 drivers/bluetooth/hci_vhci.c:290 call_write_iter include/linux/fs.h:2174 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacd/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #3 (&data->open_mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 vhci_send_frame+0x8a/0xf0 drivers/bluetooth/hci_vhci.c:71 hci_send_frame+0x1af/0x2f0 net/bluetooth/hci_core.c:4256 hci_sched_acl_pkt net/bluetooth/hci_core.c:4781 [inline] hci_sched_acl net/bluetooth/hci_core.c:4866 [inline] hci_tx_work+0xb2e/0x1a30 net/bluetooth/hci_core.c:4932 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #2 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __flush_work+0xeb/0x1a0 kernel/workqueue.c:3090 hci_dev_do_close+0x20a/0x1070 net/bluetooth/hci_core.c:1756 hci_unregister_dev+0x2d7/0x580 net/bluetooth/hci_core.c:4040 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:345 __fput+0x3fe/0x8e0 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:874 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&hdev->req_lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 hci_req_sync net/bluetooth/hci_request.c:278 [inline] bg_scan_update+0xa1/0x4a0 net/bluetooth/hci_request.c:2952 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #0 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __flush_work+0xeb/0x1a0 kernel/workqueue.c:3090 __cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3181 hci_request_cancel_all+0xcb/0x300 net/bluetooth/hci_request.c:3522 hci_dev_do_close+0x51/0x1070 net/bluetooth/hci_core.c:1736 hci_rfkill_set_block+0x114/0x1a0 net/bluetooth/hci_core.c:2235 rfkill_set_block+0x1e7/0x430 net/rfkill/core.c:345 rfkill_fop_write+0x5b7/0x790 net/rfkill/core.c:1274 vfs_write+0x30c/0xe50 fs/read_write.c:592 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: (work_completion)(&hdev->bg_scan_update) --> &data->open_mutex --> rfkill_global_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rfkill_global_mutex); lock(&data->open_mutex); lock(rfkill_global_mutex); lock((work_completion)(&hdev->bg_scan_update)); *** DEADLOCK *** 1 lock held by syz.0.15/4293: #0: ffffffff8dcbe6a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a5/0x790 net/rfkill/core.c:1266 stack backtrace: CPU: 1 PID: 4293 Comm: syz.0.15 Not tainted 5.15.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __flush_work+0xeb/0x1a0 kernel/workqueue.c:3090 __cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3181 hci_request_cancel_all+0xcb/0x300 net/bluetooth/hci_request.c:3522 hci_dev_do_close+0x51/0x1070 net/bluetooth/hci_core.c:1736 hci_rfkill_set_block+0x114/0x1a0 net/bluetooth/hci_core.c:2235 rfkill_set_block+0x1e7/0x430 net/rfkill/core.c:345 rfkill_fop_write+0x5b7/0x790 net/rfkill/core.c:1274 vfs_write+0x30c/0xe50 fs/read_write.c:592 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe957e3f719 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:00007ffc17f433a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe957ff6f80 RCX: 00007fe957e3f719 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fe957eb275e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe957ff6f80 R14: 00007fe957ff6f80 R15: 00000000000014f4 final repro crashed as (corrupted=false): ====================================================== WARNING: possible circular locking dependency detected 5.15.172-syzkaller #0 Not tainted ------------------------------------------------------ syz.0.15/4293 is trying to acquire lock: ffff888077b48c28 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}, at: __flush_work+0xcf/0x1a0 kernel/workqueue.c:3090 but task is already holding lock: ffffffff8dcbe6a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a5/0x790 net/rfkill/core.c:1266 which lock already depends on the new lock. the existing dependency chain (in reverse order) is: -> #4 (rfkill_global_mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 rfkill_register+0x30/0x880 net/rfkill/core.c:1045 hci_register_dev+0x4dd/0xa50 net/bluetooth/hci_core.c:3960 __vhci_create_device drivers/bluetooth/hci_vhci.c:129 [inline] vhci_create_device+0x310/0x590 drivers/bluetooth/hci_vhci.c:153 vhci_get_user drivers/bluetooth/hci_vhci.c:210 [inline] vhci_write+0x382/0x430 drivers/bluetooth/hci_vhci.c:290 call_write_iter include/linux/fs.h:2174 [inline] new_sync_write fs/read_write.c:507 [inline] vfs_write+0xacd/0xe50 fs/read_write.c:594 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #3 (&data->open_mutex){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 vhci_send_frame+0x8a/0xf0 drivers/bluetooth/hci_vhci.c:71 hci_send_frame+0x1af/0x2f0 net/bluetooth/hci_core.c:4256 hci_sched_acl_pkt net/bluetooth/hci_core.c:4781 [inline] hci_sched_acl net/bluetooth/hci_core.c:4866 [inline] hci_tx_work+0xb2e/0x1a30 net/bluetooth/hci_core.c:4932 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #2 ((work_completion)(&hdev->tx_work)){+.+.}-{0:0}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __flush_work+0xeb/0x1a0 kernel/workqueue.c:3090 hci_dev_do_close+0x20a/0x1070 net/bluetooth/hci_core.c:1756 hci_unregister_dev+0x2d7/0x580 net/bluetooth/hci_core.c:4040 vhci_release+0x73/0xc0 drivers/bluetooth/hci_vhci.c:345 __fput+0x3fe/0x8e0 fs/file_table.c:280 task_work_run+0x129/0x1a0 kernel/task_work.c:188 exit_task_work include/linux/task_work.h:33 [inline] do_exit+0x6a3/0x2480 kernel/exit.c:874 do_group_exit+0x144/0x310 kernel/exit.c:996 get_signal+0xc66/0x14e0 kernel/signal.c:2900 arch_do_signal_or_restart+0xc3/0x1890 arch/x86/kernel/signal.c:867 handle_signal_work kernel/entry/common.c:154 [inline] exit_to_user_mode_loop+0x97/0x130 kernel/entry/common.c:178 exit_to_user_mode_prepare+0xb1/0x140 kernel/entry/common.c:214 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline] syscall_exit_to_user_mode+0x5d/0x240 kernel/entry/common.c:307 do_syscall_64+0x47/0xb0 arch/x86/entry/common.c:86 entry_SYSCALL_64_after_hwframe+0x66/0xd0 -> #1 (&hdev->req_lock){+.+.}-{3:3}: lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __mutex_lock_common+0x1da/0x25a0 kernel/locking/mutex.c:596 __mutex_lock kernel/locking/mutex.c:729 [inline] mutex_lock_nested+0x17/0x20 kernel/locking/mutex.c:743 hci_req_sync net/bluetooth/hci_request.c:278 [inline] bg_scan_update+0xa1/0x4a0 net/bluetooth/hci_request.c:2952 process_one_work+0x8a1/0x10c0 kernel/workqueue.c:2310 worker_thread+0xaca/0x1280 kernel/workqueue.c:2457 kthread+0x3f6/0x4f0 kernel/kthread.c:334 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287 -> #0 ((work_completion)(&hdev->bg_scan_update)){+.+.}-{0:0}: check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __flush_work+0xeb/0x1a0 kernel/workqueue.c:3090 __cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3181 hci_request_cancel_all+0xcb/0x300 net/bluetooth/hci_request.c:3522 hci_dev_do_close+0x51/0x1070 net/bluetooth/hci_core.c:1736 hci_rfkill_set_block+0x114/0x1a0 net/bluetooth/hci_core.c:2235 rfkill_set_block+0x1e7/0x430 net/rfkill/core.c:345 rfkill_fop_write+0x5b7/0x790 net/rfkill/core.c:1274 vfs_write+0x30c/0xe50 fs/read_write.c:592 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 other info that might help us debug this: Chain exists of: (work_completion)(&hdev->bg_scan_update) --> &data->open_mutex --> rfkill_global_mutex Possible unsafe locking scenario: CPU0 CPU1 ---- ---- lock(rfkill_global_mutex); lock(&data->open_mutex); lock(rfkill_global_mutex); lock((work_completion)(&hdev->bg_scan_update)); *** DEADLOCK *** 1 lock held by syz.0.15/4293: #0: ffffffff8dcbe6a8 (rfkill_global_mutex){+.+.}-{3:3}, at: rfkill_fop_write+0x1a5/0x790 net/rfkill/core.c:1266 stack backtrace: CPU: 1 PID: 4293 Comm: syz.0.15 Not tainted 5.15.172-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024 Call Trace: __dump_stack lib/dump_stack.c:88 [inline] dump_stack_lvl+0x1e3/0x2d0 lib/dump_stack.c:106 check_noncircular+0x2f8/0x3b0 kernel/locking/lockdep.c:2133 check_prev_add kernel/locking/lockdep.c:3053 [inline] check_prevs_add kernel/locking/lockdep.c:3172 [inline] validate_chain+0x1649/0x5930 kernel/locking/lockdep.c:3788 __lock_acquire+0x1295/0x1ff0 kernel/locking/lockdep.c:5012 lock_acquire+0x1db/0x4f0 kernel/locking/lockdep.c:5623 __flush_work+0xeb/0x1a0 kernel/workqueue.c:3090 __cancel_work_timer+0x519/0x6a0 kernel/workqueue.c:3181 hci_request_cancel_all+0xcb/0x300 net/bluetooth/hci_request.c:3522 hci_dev_do_close+0x51/0x1070 net/bluetooth/hci_core.c:1736 hci_rfkill_set_block+0x114/0x1a0 net/bluetooth/hci_core.c:2235 rfkill_set_block+0x1e7/0x430 net/rfkill/core.c:345 rfkill_fop_write+0x5b7/0x790 net/rfkill/core.c:1274 vfs_write+0x30c/0xe50 fs/read_write.c:592 ksys_write+0x1a2/0x2c0 fs/read_write.c:647 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x3b/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x66/0xd0 RIP: 0033:0x7fe957e3f719 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:00007ffc17f433a8 EFLAGS: 00000246 ORIG_RAX: 0000000000000001 RAX: ffffffffffffffda RBX: 00007fe957ff6f80 RCX: 00007fe957e3f719 RDX: 0000000000000008 RSI: 0000000020000080 RDI: 0000000000000003 RBP: 00007fe957eb275e R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fe957ff6f80 R14: 00007fe957ff6f80 R15: 00000000000014f4