Extracting prog: 16m0.705043799s
Minimizing prog: 1h7m23.192696735s
Simplifying prog options: 7m52.801414195s
Extracting C: 2m44.847964832s
Simplifying C: 0s


extracting reproducer from 37 programs
testing a last program of every proc
single: executing 7 programs separately with timeout 6m0s
testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): openat$cgroup_root-socket$nl_generic-ioctl$sock_SIOCGIFINDEX-sendmsg$nl_route_sched-syz_open_dev$dri-syz_genetlink_get_family_id$tipc-ioctl$DRM_IOCTL_MODE_CREATE_LEASE-openat$comedi-prctl$PR_SCHED_CORE-prlimit64-sched_setscheduler-openat$sequencer-syz_open_dev$sndmidi-writev-ioctl$sock_inet6_SIOCDELRT-socket$key-prctl$PR_SCHED_CORE-socket$kcm-sendmsg$inet-socketpair$unix-ioctl$XFS_IOC_OPEN_BY_HANDLE-syz_open_dev$tty1-ioctl$PIO_CMAP-ioctl$COMEDI_DEVCONFIG-prctl$PR_SET_SYSCALL_USER_DISPATCH_ON-add_key$keyring-clock_nanosleep-keyctl$invalidate-setsockopt$bt_BT_CHANNEL_POLICY-quotactl$Q_SYNC
detailed listing:
executing program 0:
openat$cgroup_root(0xffffffffffffff9c, &(0x7f0000000000), 0x200002, 0x0)
socket$nl_generic(0x10, 0x3, 0x10)
ioctl$sock_SIOCGIFINDEX(0xffffffffffffffff, 0x8933, 0x0)
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f00000007c0)={0x0, 0x0, &(0x7f0000004640)={0x0}, 0x1, 0x0, 0x0, 0x40}, 0x0)
r0 = syz_open_dev$dri(&(0x7f0000000000), 0x6375, 0x0)
syz_genetlink_get_family_id$tipc(0x0, 0xffffffffffffffff)
ioctl$DRM_IOCTL_MODE_CREATE_LEASE(r0, 0xc01864c6, &(0x7f00000000c0)={0x0, 0x0, 0x0, 0x0, <r1=>0xffffffffffffffff})
r2 = openat$comedi(0xffffffffffffff9c, &(0x7f0000000080)='/dev/comedi2\x00', 0x1, 0x0)
prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x1, 0x0)
prlimit64(0x0, 0xe, &(0x7f0000000380)={0x8, 0x100008b}, 0x0)
sched_setscheduler(0x0, 0x1, &(0x7f0000000200)=0x5)
openat$sequencer(0xffffffffffffff9c, &(0x7f0000000300), 0x80200, 0x0)
r3 = syz_open_dev$sndmidi(&(0x7f00000004c0), 0x2, 0x141102)
writev(r3, &(0x7f0000000840)=[{0x0}], 0x1)
ioctl$sock_inet6_SIOCDELRT(0xffffffffffffffff, 0x890c, &(0x7f0000005fc0)={@remote, @private0={0xfc, 0x0, '\x00', 0x1}, @empty, 0x7, 0x8000, 0x3d, 0x500, 0x5, 0x18c0012})
socket$key(0xf, 0x3, 0x2)
prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x0, &(0x7f0000000100))
r4 = socket$kcm(0x2, 0x3, 0x2)
sendmsg$inet(r4, &(0x7f0000001640)={&(0x7f0000000300)={0x2, 0x0, @multicast2=0xe0000001}, 0x10, 0x0, 0x0, &(0x7f0000000540)=ANY=[], 0x38}, 0x0)
socketpair$unix(0x1, 0x2, 0x0, 0x0)
ioctl$XFS_IOC_OPEN_BY_HANDLE(r3, 0xc01c586b, 0x0)
r5 = syz_open_dev$tty1(0xc, 0x4, 0x1)
ioctl$PIO_CMAP(r5, 0x4b71, &(0x7f00000017c0)={0x6, 0x46, 0x45, 0xb0e, 0x2, 0xae12})
ioctl$COMEDI_DEVCONFIG(r2, 0x40946400, &(0x7f00000000c0)={'pcl818\x00', [0x140, 0x2, 0x3, 0xbf, 0x1, 0x2, 0xdd, 0x6, 0x8, 0xf, 0x2, 0x10, 0xf8, 0x40, 0x4ce, 0x9e9b, 0x8000, 0x401, 0x9, 0x9, 0x7fff, 0xf, 0xa, 0x9, 0xffd, 0x8, 0xaf, 0x0, 0x10001fc, 0x0, 0x2, 0x1]})
prctl$PR_SET_SYSCALL_USER_DISPATCH_ON(0x3b, 0x1, 0x0, 0x4, &(0x7f0000000180))
r6 = add_key$keyring(&(0x7f0000000100), &(0x7f00000001c0)={'syz', 0x3}, 0x0, 0x0, 0xfffffffffffffffc)
clock_nanosleep(0x2, 0x1, 0x0, 0x0)
keyctl$invalidate(0x15, r6)
setsockopt$bt_BT_CHANNEL_POLICY(r1, 0x112, 0xa, &(0x7f0000000040)=0x9, 0x4)
quotactl$Q_SYNC(0xffffffff80000101, 0x0, 0x0, 0x0)

program did not crash
testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sendmsg$NFT_BATCH-openat$sndseq-socket$inet6_tcp-openat-openat$sequencer2-openat$tun-ioctl$sock_SIOCGIFINDEX-prctl$PR_SCHED_CORE-sendmsg$IPSET_CMD_HEADER-prlimit64-sched_setscheduler-syz_open_dev$sndmidi-writev-bpf$MAP_CREATE-bpf$MAP_LOOKUP_BATCH-bpf$MAP_CREATE-bpf$BPF_PROG_RAW_TRACEPOINT_LOAD-write-ioctl$vim2m_VIDIOC_REQBUFS-socket$l2tp6-getsockopt$inet_sctp_SCTP_RECVNXTINFO-bpf$BPF_PROG_WITH_BTFID_LOAD-mkdirat-mount$pvfs2-mount
detailed listing:
executing program 0:
sendmsg$NFT_BATCH(0xffffffffffffffff, 0x0, 0x80)
openat$sndseq(0xffffffffffffff9c, &(0x7f0000000180), 0x80000)
r0 = socket$inet6_tcp(0xa, 0x1, 0x0)
r1 = openat(0xffffffffffffff9c, &(0x7f0000000380)='./cgroup.cpu/cgroup.procs\x00', 0x0, 0x0)
openat$sequencer2(0xffffffffffffff9c, &(0x7f00000003c0), 0x0, 0x0)
openat$tun(0xffffffffffffff9c, 0x0, 0x0, 0x0)
ioctl$sock_SIOCGIFINDEX(0xffffffffffffffff, 0x8933, 0x0)
prctl$PR_SCHED_CORE(0x3e, 0x1, 0x0, 0x2, 0x0)
sendmsg$IPSET_CMD_HEADER(0xffffffffffffffff, 0x0, 0x4000)
prlimit64(0x0, 0xe, &(0x7f0000000380)={0x8, 0x100008b}, 0x0)
sched_setscheduler(0x0, 0x1, &(0x7f0000000000)=0x7)
r2 = syz_open_dev$sndmidi(&(0x7f00000004c0), 0x2, 0x143102)
writev(r2, &(0x7f0000000840)=[{&(0x7f00000002c0)="94", 0xf000}, {0x0}], 0x2)
bpf$MAP_CREATE(0x0, &(0x7f0000000840)=ANY=[@ANYBLOB], 0x48)
bpf$MAP_LOOKUP_BATCH(0x18, 0x0, 0x0)
r3 = bpf$MAP_CREATE(0x0, 0x0, 0x50)
r4 = bpf$BPF_PROG_RAW_TRACEPOINT_LOAD(0x5, &(0x7f0000000200)={0x11, 0x3, &(0x7f0000000100)=ANY=[], &(0x7f00000005c0)='GPL\x00', 0xc, 0x0, 0x0, 0x0, 0x0, '\x00', 0x0, 0x0, 0xffffffffffffffff, 0x8, &(0x7f00000000c0)={0x0, 0x1}, 0x8}, 0x94)
write(r0, &(0x7f0000000180), 0x0)
ioctl$vim2m_VIDIOC_REQBUFS(0xffffffffffffffff, 0xc0145608, &(0x7f00000000c0)={0x1, 0x2, 0x4, 0x0, 0xfe})
socket$l2tp6(0xa, 0x2, 0x73)
getsockopt$inet_sctp_SCTP_RECVNXTINFO(r1, 0x84, 0x21, &(0x7f00000001c0), &(0x7f0000000340)=0x4)
bpf$BPF_PROG_WITH_BTFID_LOAD(0x5, &(0x7f0000000500)=@bpf_ext={0x1a, 0xf, &(0x7f0000000640)=ANY=[@ANYBLOB="1800000092870076000000000000000000", @ANYRES32=r3, @ANYBLOB="0000000000000000b702000014000000b70300000000"], &(0x7f0000000180)='GPL\x00', 0x7, 0x0, 0x0, 0x40f00, 0x20, '\x00', 0x0, 0x19, 0xffffffffffffffff, 0x8, 0x0, 0x0, 0x10, 0x0, 0x0, 0x1, r4, 0x0, 0x0, 0x0, 0x10, 0x4a6}, 0x94)
mkdirat(0xffffffffffffff9c, &(0x7f0000000080)='./proc\x00', 0x1ff)
mount$pvfs2(&(0x7f0000000600), &(0x7f0000000280)='./proc\x00', &(0x7f0000000140), 0x4, &(0x7f0000000440)=ANY=[@ANYBLOB="7d7db73470e13d4da84fc4b2ff5c305df72d4b3b3f2201a28dc097cdc8013f83d4c96d6e9e602dda338f390cb69696f3e20c2e16be9f42c6e6dcc60b5c62776cb2b69f1155048d96c5611d22f7b6b791862f8ef4c2a356e594a328a0e6a096dd191db6672e1ef5f1fb822101095d05771d64eb75fa254d4ef04b6f60b824da9af082f9a58036c2053b00a79df6caae38e845e12d3335ce323df0397754ee4158baf3adec659b77765c292c4e04b8010cca116353eeb544506d400c5075dace28e5431e79ab238433ca6f8d1febaf1800d6bdbf7f701a952b0c0dd1b4010cde7e298762e5e2548fe9a72ce7d724357afd5dcf4607fe54b2"])
mount(0x0, &(0x7f0000000080)='./proc\x00', &(0x7f0000000100)='proc\x00', 0x0, 0x0)

program did not crash
testing program (duration=6m0s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime-eventfd2-read$eventfd
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)
r2 = eventfd2(0x0, 0x0)
read$eventfd(r2, &(0x7f0000000400), 0x8)

program crashed: INFO: rcu detected stall in syscall_exit_to_user_mode
single: successfully extracted reproducer
found reproducer with 9 syscalls
minimizing guilty program
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime-eventfd2
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)
eventfd2(0x0, 0x0)

program crashed: INFO: rcu detected stall in cleanup_net
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program crashed: INFO: rcu detected stall in syscall_enter_from_user_mode
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000))
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
gettid()
fcntl$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=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4}, &(0x7f0000000000)=<r0=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r0, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, 0x0, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, 0x0)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
gettid()
timer_create(0x1, 0x0, &(0x7f0000000000)=<r0=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r0, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, 0x0)
fcntl$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=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, 0x0)
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, 0x0, 0x0)

program did not crash
extracting C reproducer
testing compiled C program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
program crashed: INFO: rcu detected stall in corrupted
a never seen crash title: INFO: rcu detected stall in corrupted, ignore
simplifying guilty program options
testing program (duration=4m38.093227406s, {Threaded:false Repeat:true RepeatTimes:0 Procs:5 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program crashed: INFO: rcu detected stall in corrupted
a never seen crash title: INFO: rcu detected stall in corrupted, ignore
testing program (duration=4m38.093227406s, {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}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program did not crash
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program crashed: INFO: rcu detected stall in syscall_exit_to_user_mode
validation run: crashed=true
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program crashed: INFO: rcu detected stall in syscall_exit_to_user_mode
validation run: crashed=true
testing program (duration=4m38.093227406s, {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 CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): prlimit64-sched_setscheduler-gettid-timer_create-fcntl$lock-mprotect-timer_settime
detailed listing:
executing program 0:
prlimit64(0x0, 0xe, &(0x7f0000000140)={0xa, 0x8b}, 0x0)
sched_setscheduler(0x0, 0x2, &(0x7f0000000280)=0x8)
r0 = gettid()
timer_create(0x1, &(0x7f0000000800)={0x0, 0x21, 0x4, @tid=r0}, &(0x7f0000000000)=<r1=>0x0)
fcntl$lock(0xffffffffffffffff, 0x6, &(0x7f0000000040)={0x0, 0x0, 0x3ed4, 0x5})
mprotect(&(0x7f0000000000/0xf000)=nil, 0xf000, 0x9)
timer_settime(r1, 0x1, &(0x7f0000000040), 0x0)

program crashed: INFO: rcu detected stall in batadv_nc_worker
validation run: crashed=true
reproducing took 1h42m9.877253089s
repro crashed as (corrupted=false):
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P144/1:b..l
	(detected by 0, t=10503 jiffies, g=6681, q=32)
task:kworker/u4:1    state:R  running task     stack:23968 pid:  144 ppid:     2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:435
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x209/0x400 kernel/locking/lockdep.c:5741
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000169faa0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 9360f8eda0224d00
RDX: 0000000000000000 RSI: ffffffff8a2b3e80 RDI: ffffffff8a7a4b80
RBP: ffffc9000169fbc0 R08: dffffc0000000000 R09: 1ffffffff2042818
R10: dffffc0000000000 R11: fffffbfff2042819 R12: 1ffff920002d3f60
R13: ffffffff8c31efa0 R14: 0000000000000246 R15: dffffc0000000000
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0xc9/0x5c0 net/batman-adv/network-coding.c:723
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread starved for 10528 jiffies! g6681 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28080 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 4433 Comm: syz.1.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1cd/0x250 kernel/rcu/tree_stall.h:487
 print_other_cpu_stall+0x1110/0x1270 kernel/rcu/tree_stall.h:592
 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x845/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ce e5 91 f7 48 89 df e8 d6 c7 92 f7 e8 11 c4 b3 f7 fb bf 01 00 00 00 <e8> 16 ce 86 f7 65 8b 05 97 e4 36 76 85 c0 74 02 5b c3 e8 d4 f1 34
RSP: 0018:ffffc900041ffbc0 EFLAGS: 00000282
RAX: a0ffb66feca75500 RBX: ffff88805a86ef00 RCX: a0ffb66feca75500
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffff88805a86ef03 R09: 1ffff1100b50dde0
R10: dffffc0000000000 R11: ffffed100b50dde1 R12: dffffc0000000000
R13: ffff88805a86ef00 R14: 0000000000000021 R15: 000000001c000004
 spin_unlock_irq include/linux/spinlock.h:414 [inline]
 get_signal+0x11f2/0x12e0 kernel/signal.c:2916
 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:157 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd2e8c2c159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd2e828c028 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fd2e8eb3fa0 RCX: 00007fd2e8c2c159
RDX: 0000200000000040 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00007fd2e8cc306b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd2e8eb4038 R14: 00007fd2e8eb3fa0 R15: 00007fff26d0bc78
 </TASK>

final repro crashed as (corrupted=false):
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	Tasks blocked on level-0 rcu_node (CPUs 0-1): P144/1:b..l
	(detected by 0, t=10503 jiffies, g=6681, q=32)
task:kworker/u4:1    state:R  running task     stack:23968 pid:  144 ppid:     2 flags:0x00004000
Workqueue: bat_events batadv_nc_worker
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 preempt_schedule_irq+0xbb/0x160 kernel/sched/core.c:6799
 irqentry_exit+0x63/0x70 kernel/entry/common.c:435
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:lock_acquire+0x209/0x400 kernel/locking/lockdep.c:5741
Code: f7 84 24 80 00 00 00 00 02 00 00 43 c6 44 3c 04 f8 0f 85 f0 00 00 00 41 f7 c6 00 02 00 00 74 01 fb 48 c7 44 24 60 0e 36 e0 45 <4b> c7 04 3c 00 00 00 00 43 c7 44 3c 08 00 00 00 00 65 48 8b 04 25
RSP: 0018:ffffc9000169faa0 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000000 RCX: 9360f8eda0224d00
RDX: 0000000000000000 RSI: ffffffff8a2b3e80 RDI: ffffffff8a7a4b80
RBP: ffffc9000169fbc0 R08: dffffc0000000000 R09: 1ffffffff2042818
R10: dffffc0000000000 R11: fffffbfff2042819 R12: 1ffff920002d3f60
R13: ffffffff8c31efa0 R14: 0000000000000246 R15: dffffc0000000000
 rcu_lock_acquire+0x2a/0x30 include/linux/rcupdate.h:313
 rcu_read_lock include/linux/rcupdate.h:740 [inline]
 batadv_nc_purge_orig_hash net/batman-adv/network-coding.c:412 [inline]
 batadv_nc_worker+0xc9/0x5c0 net/batman-adv/network-coding.c:723
 process_one_work+0x867/0xff0 kernel/workqueue.c:2310
 worker_thread+0xad7/0x12a0 kernel/workqueue.c:2457
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: rcu_preempt kthread starved for 10528 jiffies! g6681 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28080 pid:   15 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5049 [inline]
 __schedule+0x11c3/0x4350 kernel/sched/core.c:6395
 schedule+0x11b/0x1e0 kernel/sched/core.c:6478
 schedule_timeout+0x184/0x2d0 kernel/time/timer.c:2117
 rcu_gp_fqs_loop+0x2be/0x11f0 kernel/rcu/tree.c:1972
 rcu_gp_kthread+0x9a/0x370 kernel/rcu/tree.c:2145
 kthread+0x42e/0x520 kernel/kthread.c:334
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 4433 Comm: syz.1.18 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
Call Trace:
 <IRQ>
 dump_stack_lvl+0x188/0x250 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x3a2/0x3d0 lib/nmi_backtrace.c:111
 nmi_trigger_cpumask_backtrace+0x163/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:166 [inline]
 rcu_check_gp_kthread_starvation+0x1cd/0x250 kernel/rcu/tree_stall.h:487
 print_other_cpu_stall+0x1110/0x1270 kernel/rcu/tree_stall.h:592
 check_cpu_stall kernel/rcu/tree_stall.h:745 [inline]
 rcu_pending kernel/rcu/tree.c:3936 [inline]
 rcu_sched_clock_irq+0x845/0x1120 kernel/rcu/tree.c:2619
 update_process_times+0x193/0x200 kernel/time/timer.c:2021
 tick_sched_handle kernel/time/tick-sched.c:254 [inline]
 tick_sched_timer+0x37d/0x560 kernel/time/tick-sched.c:1473
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4b0/0xb60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x397/0x8b0 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1097 [inline]
 __sysvec_apic_timer_interrupt+0x137/0x4a0 arch/x86/kernel/apic/apic.c:1114
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0x9b/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x16/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x25/0x40 kernel/locking/spinlock.c:202
Code: 00 00 00 66 90 53 48 89 fb 48 83 c7 18 48 8b 74 24 08 e8 ce e5 91 f7 48 89 df e8 d6 c7 92 f7 e8 11 c4 b3 f7 fb bf 01 00 00 00 <e8> 16 ce 86 f7 65 8b 05 97 e4 36 76 85 c0 74 02 5b c3 e8 d4 f1 34
RSP: 0018:ffffc900041ffbc0 EFLAGS: 00000282
RAX: a0ffb66feca75500 RBX: ffff88805a86ef00 RCX: a0ffb66feca75500
RDX: dffffc0000000000 RSI: ffffffff8a2b2be0 RDI: 0000000000000001
RBP: 0000000000000000 R08: ffff88805a86ef03 R09: 1ffff1100b50dde0
R10: dffffc0000000000 R11: ffffed100b50dde1 R12: dffffc0000000000
R13: ffff88805a86ef00 R14: 0000000000000021 R15: 000000001c000004
 spin_unlock_irq include/linux/spinlock.h:414 [inline]
 get_signal+0x11f2/0x12e0 kernel/signal.c:2916
 arch_do_signal_or_restart+0xe6/0x12a0 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:157 [inline]
 exit_to_user_mode_loop+0x9e/0x130 kernel/entry/common.c:181
 exit_to_user_mode_prepare+0xee/0x180 kernel/entry/common.c:217
 __syscall_exit_to_user_mode_work kernel/entry/common.c:299 [inline]
 syscall_exit_to_user_mode+0x16/0x40 kernel/entry/common.c:310
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd2e8c2c159
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd2e828c028 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007fd2e8eb3fa0 RCX: 00007fd2e8c2c159
RDX: 0000200000000040 RSI: 0000000000000001 RDI: 0000000000000000
RBP: 00007fd2e8cc306b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd2e8eb4038 R14: 00007fd2e8eb3fa0 R15: 00007fff26d0bc78
 </TASK>