Extracting prog: 13m26.675765877s Minimizing prog: 2h23m43.305140011s Simplifying prog options: 10m58.497530965s Extracting C: 5m12.870084493s 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: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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash program crashed: INFO: task hung in vfs_coredump single: successfully extracted reproducer found reproducer with 8 syscalls minimizing guilty program testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, 0xffffffffffffffff, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000), 0x0) socket$nl_sock_diag(0x10, 0x3, 0x4) r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r0, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}}) r1 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r1, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) r0 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {}, 0x2c, {'wfdno', 0x3d, r0}}) r1 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r1, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, 0x0, 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(0x0, 0x0, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(0x0, 0x0) r0 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {}, 0x2c, {'wfdno', 0x3d, r0}}) r1 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r1, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, 0x0, &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', 0x0, 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000), 0x0) socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, 0x0) r0 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r0, 0x0) program did not crash testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, 0x0, 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash extracting C reproducer testing compiled C program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap program crashed: no output from test machine a never seen crash title: no output from test machine, ignore simplifying guilty program options testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash testing program (duration=8m45.833482962s, {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: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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program crashed: lost connection to test machine suppressed program crash: lost connection to test machine testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program did not crash validation run: crashed=false testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program crashed: INFO: task hung in vfs_coredump validation run: crashed=true testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program crashed: INFO: task hung in vfs_coredump validation run: crashed=true testing program (duration=8m45.833482962s, {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}}): mkdirat-mmap-rseq-pipe2$9p-socket$nl_sock_diag-mount$9p_fd-openat$cgroup_ro-mmap detailed listing: executing program 0: mkdirat(0xffffffffffffff9c, &(0x7f0000000380)='./file0\x00', 0x1c1) mmap(&(0x7f0000000000/0xa000)=nil, 0xa000, 0xd3283d0368e269b3, 0x8031, 0xffffffffffffffff, 0x0) (async) rseq(&(0x7f0000001080)={0x0, 0x0, 0x0, 0x1}, 0x20, 0x0, 0x0) pipe2$9p(&(0x7f0000000000)={0xffffffffffffffff}, 0x0) r1 = socket$nl_sock_diag(0x10, 0x3, 0x4) mount$9p_fd(0x0, &(0x7f00000001c0)='./file0\x00', &(0x7f00000000c0), 0x4000, &(0x7f0000000180)={'trans=fd,', {'rfdno', 0x3d, r0}, 0x2c, {'wfdno', 0x3d, r1}}) r2 = openat$cgroup_ro(0xffffffffffffff9c, &(0x7f0000000080)='cgroup.controllers\x00', 0x275a, 0x0) mmap(&(0x7f0000000000/0x3000)=nil, 0x3000, 0x1, 0x10012, r2, 0x0) program crashed: INFO: task hung in vfs_coredump validation run: crashed=true reproducing took 3h19m6.23045973s repro crashed as (corrupted=false): INFO: task syz.0.152:6525 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.152 state:D stack:24408 pid:6525 tgid:6523 ppid:6004 task_flags:0x400640 flags:0x00080802 Call Trace: context_switch kernel/sched/core.c:5354 [inline] __schedule+0x165c/0x5520 kernel/sched/core.c:6966 __schedule_loop kernel/sched/core.c:7049 [inline] schedule+0x164/0x360 kernel/sched/core.c:7064 schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x3c0/0x690 kernel/sched/completion.c:121 wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:269 coredump_wait fs/coredump.c:537 [inline] vfs_coredump+0x9d0/0x4530 fs/coredump.c:1202 get_signal+0x1107/0x1330 kernel/signal.c:3022 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:283 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:352 [inline] irqentry_exit+0x188/0x700 kernel/entry/common.c:219 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0033:0x7fa1f48527f0 RSP: 002b:00007fa1f57c2a78 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007fa1f4c16090 RCX: 00007fa1f499c819 RDX: 00007fa1f57c2a80 RSI: 00007fa1f57c2bb0 RDI: 000000000000000b RBP: 00007fa1f4a32c91 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000010012 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa1f4c16128 R14: 00007fa1f4c16090 R15: 00007ffd6c538e58 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 1 lock held by udevd/5212: 2 locks held by getty/5600: #0: ffff8880329050a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xfd3/0x1030 kernel/hung_task.c:561 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 0c 82 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 f1 0e 00 fb f4 3c f0 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffffff8e607dc0 EFLAGS: 00000242 RAX: 0000000000475549 RBX: ffffffff819b642a RCX: 0000000080000001 RDX: 0000000000000001 RSI: ffffffff8e106c7e RDI: ffffffff8c2a9260 RBP: ffffffff8e607eb0 R08: ffff8880b86339db R09: 1ffff110170c673b R10: dffffc0000000000 R11: ffffed10170c673c R12: 0000000000000000 R13: 1ffffffff1cd25d8 R14: 0000000000000000 R15: 1ffffffff1cd25d8 FS: 0000000000000000(0000) GS:ffff888125204000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe43be9f00 CR3: 00000000298ec000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 rest_init+0x2de/0x300 init/main.c:761 start_kernel+0x38a/0x3e0 init/main.c:1219 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x147 final repro crashed as (corrupted=false): INFO: task syz.0.152:6525 blocked for more than 143 seconds. Not tainted syzkaller #0 "echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message. task:syz.0.152 state:D stack:24408 pid:6525 tgid:6523 ppid:6004 task_flags:0x400640 flags:0x00080802 Call Trace: context_switch kernel/sched/core.c:5354 [inline] __schedule+0x165c/0x5520 kernel/sched/core.c:6966 __schedule_loop kernel/sched/core.c:7049 [inline] schedule+0x164/0x360 kernel/sched/core.c:7064 schedule_timeout+0xc3/0x2c0 kernel/time/sleep_timeout.c:75 do_wait_for_common kernel/sched/completion.c:100 [inline] __wait_for_common+0x3c0/0x690 kernel/sched/completion.c:121 wait_for_common kernel/sched/completion.c:132 [inline] wait_for_completion_state+0x1c/0x40 kernel/sched/completion.c:269 coredump_wait fs/coredump.c:537 [inline] vfs_coredump+0x9d0/0x4530 fs/coredump.c:1202 get_signal+0x1107/0x1330 kernel/signal.c:3022 arch_do_signal_or_restart+0xbc/0x830 arch/x86/kernel/signal.c:337 __exit_to_user_mode_loop kernel/entry/common.c:64 [inline] exit_to_user_mode_loop kernel/entry/common.c:98 [inline] __exit_to_user_mode_prepare include/linux/irq-entry-common.h:238 [inline] irqentry_exit_to_user_mode_prepare include/linux/irq-entry-common.h:283 [inline] irqentry_exit_to_user_mode include/linux/irq-entry-common.h:352 [inline] irqentry_exit+0x188/0x700 kernel/entry/common.c:219 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:697 RIP: 0033:0x7fa1f48527f0 RSP: 002b:00007fa1f57c2a78 EFLAGS: 00000246 RAX: 0000000000000000 RBX: 00007fa1f4c16090 RCX: 00007fa1f499c819 RDX: 00007fa1f57c2a80 RSI: 00007fa1f57c2bb0 RDI: 000000000000000b RBP: 00007fa1f4a32c91 R08: 0000000000000006 R09: 0000000000000000 R10: 0000000000010012 R11: 0000000000000246 R12: 0000000000000000 R13: 00007fa1f4c16128 R14: 00007fa1f4c16090 R15: 00007ffd6c538e58 Showing all locks held in the system: 1 lock held by khungtaskd/31: #0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_lock_acquire include/linux/rcupdate.h:312 [inline] #0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: rcu_read_lock include/linux/rcupdate.h:850 [inline] #0: ffffffff8e95d260 (rcu_read_lock){....}-{1:3}, at: debug_show_all_locks+0x2e/0x180 kernel/locking/lockdep.c:6775 1 lock held by udevd/5212: 2 locks held by getty/5600: #0: ffff8880329050a0 (&tty->ldisc_sem){++++}-{0:0}, at: tty_ldisc_ref_wait+0x25/0x70 drivers/tty/tty_ldisc.c:243 #1: ffffc9000322b2e8 (&ldata->atomic_read_lock){+.+.}-{4:4}, at: n_tty_read+0x45c/0x13a0 drivers/tty/n_tty.c:2211 ============================================= NMI backtrace for cpu 1 CPU: 1 UID: 0 PID: 31 Comm: khungtaskd Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 Call Trace: dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 nmi_cpu_backtrace+0x274/0x2d0 lib/nmi_backtrace.c:113 nmi_trigger_cpumask_backtrace+0x17a/0x300 lib/nmi_backtrace.c:62 trigger_all_cpu_backtrace include/linux/nmi.h:162 [inline] __sys_info lib/sys_info.c:157 [inline] sys_info+0x135/0x170 lib/sys_info.c:165 check_hung_uninterruptible_tasks kernel/hung_task.c:353 [inline] watchdog+0xfd3/0x1030 kernel/hung_task.c:561 kthread+0x388/0x470 kernel/kthread.c:436 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/18/2026 RIP: 0010:pv_native_safe_halt+0xf/0x20 arch/x86/kernel/paravirt.c:63 Code: 0c 82 02 c3 cc cc cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 83 f1 0e 00 fb f4 3c f0 02 00 cc cc cc cc cc cc cc cc cc cc cc cc 90 90 90 90 90 RSP: 0018:ffffffff8e607dc0 EFLAGS: 00000242 RAX: 0000000000475549 RBX: ffffffff819b642a RCX: 0000000080000001 RDX: 0000000000000001 RSI: ffffffff8e106c7e RDI: ffffffff8c2a9260 RBP: ffffffff8e607eb0 R08: ffff8880b86339db R09: 1ffff110170c673b R10: dffffc0000000000 R11: ffffed10170c673c R12: 0000000000000000 R13: 1ffffffff1cd25d8 R14: 0000000000000000 R15: 1ffffffff1cd25d8 FS: 0000000000000000(0000) GS:ffff888125204000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007efe43be9f00 CR3: 00000000298ec000 CR4: 00000000003526f0 Call Trace: arch_safe_halt arch/x86/kernel/process.c:766 [inline] default_idle+0x9/0x20 arch/x86/kernel/process.c:767 default_idle_call+0x72/0xb0 kernel/sched/idle.c:122 cpuidle_idle_call kernel/sched/idle.c:199 [inline] do_idle+0x36a/0x5f0 kernel/sched/idle.c:352 cpu_startup_entry+0x43/0x60 kernel/sched/idle.c:451 rest_init+0x2de/0x300 init/main.c:761 start_kernel+0x38a/0x3e0 init/main.c:1219 x86_64_start_reservations+0x24/0x30 arch/x86/kernel/head64.c:310 x86_64_start_kernel+0x143/0x1c0 arch/x86/kernel/head64.c:291 common_startup_64+0x13e/0x147