Extracting prog: 5m7.572159994s Minimizing prog: 1h23m29.260201769s Simplifying prog options: 12m4.937846801s Extracting C: 4m20.808258985s Simplifying C: 0s extracting reproducer from 1 programs testing a last program of every proc 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-socket$packet-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) socket$packet(0x11, 0x3, 0x300) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program crashed: INFO: rcu detected stall in corrupted single: successfully extracted reproducer found reproducer with 8 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-socket$packet-sched_setscheduler-timer_create-fcntl$lock-mprotect detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) socket$packet(0x11, 0x3, 0x300) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-socket$packet-sched_setscheduler-timer_create-fcntl$lock-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) socket$packet(0x11, 0x3, 0x300) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-socket$packet-sched_setscheduler-timer_create-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) socket$packet(0x11, 0x3, 0x300) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-socket$packet-sched_setscheduler-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) socket$packet(0x11, 0x3, 0x300) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-socket$packet-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) socket$packet(0x11, 0x3, 0x300) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program crashed: INFO: rcu detected stall in prepare_to_swait_event 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, 0x0, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, 0x0) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, 0x0, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, 0x0) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, 0x0) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, 0x0, 0x0) 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:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime program crashed: BUG: workqueue lockup in mld_ifc_work a never seen crash title: BUG: workqueue lockup in mld_ifc_work, ignore simplifying guilty program options testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program did not crash testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program crashed: BUG: workqueue lockup in wg_packet_tx_worker validation run: crashed=true testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program did not crash validation run: crashed=false testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program crashed: BUG: workqueue lockup in mld_dad_work validation run: crashed=true testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program did not crash validation run: crashed=false testing program (duration=6m0s, {Threaded:true Repeat:true RepeatTimes:0 Procs:4 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:false Wifi:false IEEE802154:false Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): gettid-prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime detailed listing: executing program 0: r0 = gettid() prlimit64(0x0, 0xe, &(0x7f0000000080)={0x8, 0x80000100008b}, 0x0) sched_setscheduler(0x0, 0x2, &(0x7f00000000c0)=0x4) timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)) fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5}) mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9) timer_settime(0x0, 0x1, &(0x7f0000000040), 0x0) program crashed: BUG: workqueue lockup in mld_ifc_work validation run: crashed=true reproducing took 2h11m11.904748861s repro crashed as (corrupted=false): BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 260s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 263s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=6 refcnt=7 pending: psi_avgs_work, vmstat_shepherd, 4*rht_deferred_worker workqueue events_long: flags=0x0 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3 pending: 2*br_multicast_gc_work pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=2 refcnt=3 pending: 2*br_multicast_gc_work workqueue events_unbound: flags=0x2 pwq 8: cpus=0-1 flags=0x4 nice=0 active=2 refcnt=3 pending: toggle_allocation_gate, flush_memcg_stats_dwork pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: crng_reseed workqueue events_freezable: flags=0x4 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: update_balloon_stats_func workqueue events_power_efficient: flags=0x80 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=5 refcnt=6 pending: 2*neigh_managed_work, gc_worker, 2*neigh_periodic_work pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=2 refcnt=3 pending: wg_ratelimiter_gc_entries, check_lifetime workqueue kvfree_rcu_reclaim: flags=0xa pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: kfree_rcu_monitor pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: kfree_rcu_monitor workqueue mm_percpu_wq: flags=0x8 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: vmstat_update pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: vmstat_update workqueue writeback: flags=0x4a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wb_workfn workqueue mld: flags=0x40008 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=59 in-flight: 64:mld_ifc_work inactive: mld_dad_work, mld_ifc_work, 2*mld_dad_work, 2*mld_ifc_work, 16*mld_dad_work, 3*mld_ifc_work, 12*mld_dad_work, 2*mld_ifc_work, mld_dad_work, 3*mld_ifc_work, 14*mld_dad_work workqueue ipv6_addrconf: flags=0x6000a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=156 pending: addrconf_dad_work inactive: 147*addrconf_dad_work, 5*addrconf_verify_work workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pool 2: cpus=0 node=0 flags=0x0 nice=0 hung=260s workers=4 idle: 395 405 10 Showing backtraces of running workers in stalled CPU-bound worker pools: pool 2: task:kworker/0:2 state:R running task stack:0 pid:64 tgid:64 ppid:2 flags:0x00004000 Workqueue: mld mld_ifc_work Call Trace: context_switch kernel/sched/core.c:6063 [inline] __schedule+0x16fe/0x23d0 kernel/sched/core.c:7883 preempt_schedule_irq+0xab/0x110 kernel/sched/core.c:8205 raw_irqentry_exit_cond_resched+0x32/0x40 kernel/entry/common.c:311 irqentry_exit+0x4a/0x60 kernel/entry/common.c:354 sysvec_apic_timer_interrupt+0x50/0x90 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702 RIP: 0010:process_one_work kernel/workqueue.c:3273 [inline] RIP: 0010:process_scheduled_works+0x7e3/0x1060 kernel/workqueue.c:3354 Code: 1f 44 00 00 e8 9e 53 32 00 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 4c 89 ef e8 25 ce 8b 00 4d 8b 5d 00 48 8b 7d b8 <41> ba 57 d6 75 cc 45 03 53 f1 74 02 0f 0b 2e e8 11 27 a9 1e 48 b8 RSP: 0018:ffffc90000d4fc98 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff88810d6dbb40 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881157780c0 RBP: ffffc90000d4fdb0 R08: ffff8881157780c7 R09: 1ffff11022aef018 R10: dffffc0000000000 R11: ffffffff85066310 R12: 1ffff11021adb818 R13: ffff888107332d18 R14: ffff88810d6dc0c4 R15: 1ffff11020e665a3 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435 kthread+0x2c7/0x360 kernel/kthread.c:389 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 44 00 00 add %r8b,(%rax) 3: e8 9e 53 32 00 call 0x3253a6 8: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax f: fc ff df 12: 41 80 3c 07 00 cmpb $0x0,(%r15,%rax,1) 17: 74 08 je 0x21 19: 4c 89 ef mov %r13,%rdi 1c: e8 25 ce 8b 00 call 0x8bce46 21: 4d 8b 5d 00 mov 0x0(%r13),%r11 25: 48 8b 7d b8 mov -0x48(%rbp),%rdi * 29: 41 ba 57 d6 75 cc mov $0xcc75d657,%r10d <-- trapping instruction 2f: 45 03 53 f1 add -0xf(%r11),%r10d 33: 74 02 je 0x37 35: 0f 0b ud2 37: 2e e8 11 27 a9 1e cs call 0x1ea9274e 3d: 48 rex.W 3e: b8 .byte 0xb8 final repro crashed as (corrupted=false): BUG: workqueue lockup - pool cpus=0 node=0 flags=0x0 nice=0 stuck for 260s! BUG: workqueue lockup - pool cpus=1 node=0 flags=0x0 nice=0 stuck for 263s! Showing busy workqueues and worker pools: workqueue events: flags=0x0 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=6 refcnt=7 pending: psi_avgs_work, vmstat_shepherd, 4*rht_deferred_worker workqueue events_long: flags=0x0 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=2 refcnt=3 pending: 2*br_multicast_gc_work pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=2 refcnt=3 pending: 2*br_multicast_gc_work workqueue events_unbound: flags=0x2 pwq 8: cpus=0-1 flags=0x4 nice=0 active=2 refcnt=3 pending: toggle_allocation_gate, flush_memcg_stats_dwork pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: crng_reseed workqueue events_freezable: flags=0x4 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: update_balloon_stats_func workqueue events_power_efficient: flags=0x80 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=5 refcnt=6 pending: 2*neigh_managed_work, gc_worker, 2*neigh_periodic_work pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=2 refcnt=3 pending: wg_ratelimiter_gc_entries, check_lifetime workqueue kvfree_rcu_reclaim: flags=0xa pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: kfree_rcu_monitor pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: kfree_rcu_monitor workqueue mm_percpu_wq: flags=0x8 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: vmstat_update pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: vmstat_update workqueue writeback: flags=0x4a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wb_workfn workqueue mld: flags=0x40008 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=59 in-flight: 64:mld_ifc_work inactive: mld_dad_work, mld_ifc_work, 2*mld_dad_work, 2*mld_ifc_work, 16*mld_dad_work, 3*mld_ifc_work, 12*mld_dad_work, 2*mld_ifc_work, mld_dad_work, 3*mld_ifc_work, 14*mld_dad_work workqueue ipv6_addrconf: flags=0x6000a pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=156 pending: addrconf_dad_work inactive: 147*addrconf_dad_work, 5*addrconf_verify_work workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg0: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg1: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-crypt-wg2: flags=0x28 pwq 2: cpus=0 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker pwq 6: cpus=1 node=0 flags=0x0 nice=0 active=1 refcnt=2 pending: wg_packet_encrypt_worker workqueue wg-kex-wg0: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg1: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker workqueue wg-kex-wg2: flags=0x6 pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pwq 8: cpus=0-1 flags=0x4 nice=0 active=1 refcnt=2 pending: wg_packet_handshake_send_worker pool 2: cpus=0 node=0 flags=0x0 nice=0 hung=260s workers=4 idle: 395 405 10 Showing backtraces of running workers in stalled CPU-bound worker pools: pool 2: task:kworker/0:2 state:R running task stack:0 pid:64 tgid:64 ppid:2 flags:0x00004000 Workqueue: mld mld_ifc_work Call Trace: context_switch kernel/sched/core.c:6063 [inline] __schedule+0x16fe/0x23d0 kernel/sched/core.c:7883 preempt_schedule_irq+0xab/0x110 kernel/sched/core.c:8205 raw_irqentry_exit_cond_resched+0x32/0x40 kernel/entry/common.c:311 irqentry_exit+0x4a/0x60 kernel/entry/common.c:354 sysvec_apic_timer_interrupt+0x50/0x90 arch/x86/kernel/apic/apic.c:1049 asm_sysvec_apic_timer_interrupt+0x1f/0x30 arch/x86/include/asm/idtentry.h:702 RIP: 0010:process_one_work kernel/workqueue.c:3273 [inline] RIP: 0010:process_scheduled_works+0x7e3/0x1060 kernel/workqueue.c:3354 Code: 1f 44 00 00 e8 9e 53 32 00 48 b8 00 00 00 00 00 fc ff df 41 80 3c 07 00 74 08 4c 89 ef e8 25 ce 8b 00 4d 8b 5d 00 48 8b 7d b8 <41> ba 57 d6 75 cc 45 03 53 f1 74 02 0f 0b 2e e8 11 27 a9 1e 48 b8 RSP: 0018:ffffc90000d4fc98 EFLAGS: 00000246 RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffff88810d6dbb40 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffff8881157780c0 RBP: ffffc90000d4fdb0 R08: ffff8881157780c7 R09: 1ffff11022aef018 R10: dffffc0000000000 R11: ffffffff85066310 R12: 1ffff11021adb818 R13: ffff888107332d18 R14: ffff88810d6dc0c4 R15: 1ffff11020e665a3 worker_thread+0xc99/0x13f0 kernel/workqueue.c:3435 kthread+0x2c7/0x360 kernel/kthread.c:389 ret_from_fork+0x67/0xa0 arch/x86/kernel/process.c:153 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:244 ---------------- Code disassembly (best guess), 1 bytes skipped: 0: 44 00 00 add %r8b,(%rax) 3: e8 9e 53 32 00 call 0x3253a6 8: 48 b8 00 00 00 00 00 movabs $0xdffffc0000000000,%rax f: fc ff df 12: 41 80 3c 07 00 cmpb $0x0,(%r15,%rax,1) 17: 74 08 je 0x21 19: 4c 89 ef mov %r13,%rdi 1c: e8 25 ce 8b 00 call 0x8bce46 21: 4d 8b 5d 00 mov 0x0(%r13),%r11 25: 48 8b 7d b8 mov -0x48(%rbp),%rdi * 29: 41 ba 57 d6 75 cc mov $0xcc75d657,%r10d <-- trapping instruction 2f: 45 03 53 f1 add -0xf(%r11),%r10d 33: 74 02 je 0x37 35: 0f 0b ud2 37: 2e e8 11 27 a9 1e cs call 0x1ea9274e 3d: 48 rex.W 3e: b8 .byte 0xb8