Extracting prog: 5m29.357838274s
Minimizing prog: 36m38.670763656s
Simplifying prog options: 13m45.94919542s
Extracting C: 3m2.817921662s
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: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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 0x0)

program crashed: INFO: rcu detected stall in corrupted
single: successfully extracted reproducer
found reproducer with 2 syscalls
minimizing guilty program
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}}): socket$nl_route
detailed listing:
executing program 0:
socket$nl_route(0x10, 0x3, 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$nl_route_sched
detailed listing:
executing program 0:
sendmsg$nl_route_sched(0xffffffffffffffff, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, 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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0x34, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x4}}]}, 0x34}}, 0x0)

program did not crash
extracting C reproducer
testing compiled C 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}}): socket$nl_route-sendmsg$nl_route_sched
program crashed: INFO: rcu detected stall in sys_newfstatat
a never seen crash title: INFO: rcu detected stall in sys_newfstatat, ignore
simplifying guilty program options
testing program (duration=6m0s, {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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 0x0)

program crashed: INFO: rcu detected stall in corrupted
extracting C reproducer
testing compiled C program (duration=6m0s, {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}}): socket$nl_route-sendmsg$nl_route_sched
program crashed: INFO: rcu detected stall in smp_call_function
a never seen crash title: INFO: rcu detected stall in smp_call_function, ignore
testing program (duration=6m0s, {Threaded:false Repeat:true RepeatTimes:0 Procs:1 Slowdown:1 Sandbox:none SandboxArg:0 Leak:false NetInjection:true NetDevices:true NetReset:true Cgroups:true BinfmtMisc:true CloseFDs:true KCSAN:false DevlinkPCI:false NicVF:false USB:true VhciInjection:true Wifi:true IEEE802154:true Sysctl:true Swap:true UseTmpDir:true HandleSegv:true Trace:false CallComments:true LegacyOptions:{Collide:false Fault:false FaultCall:0 FaultNth:0}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 0x0)

program did not crash
testing program (duration=6m0s, {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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 0x0)

program crashed: INFO: rcu detected stall in seq_read_iter
validation run: crashed=true
testing program (duration=6m0s, {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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 0x0)

program crashed: INFO: rcu detected stall in corrupted
validation run: crashed=true
testing program (duration=6m0s, {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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 0x0)

program crashed: INFO: rcu detected stall in corrupted
validation run: crashed=true
reproducing took 1h6m38.095902178s
repro crashed as (corrupted=true):
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (3 ticks this GP) idle=ab3c/1/0x4000000000000000 softirq=18026/18026 fqs=1
rcu: 	(t=10597 jiffies g=15109 q=1923 ncpus=2)
rcu: rcu_preempt kthread timer wakeup didn't happen for 9978 jiffies! g15109 f0x0 RCU_GP_WAIT_FQS(5) ->state=I
rcu: 	Possible timer handling issue on cpu=1 timer-softirq=3821
rcu: rcu_preempt kthread starved for 9979 jiffies! g15109 f0x0 RCU_GP_WAIT_FQS(5) ->state=I ->cpu=1
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:I stack:28104 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 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
 </TASK>
CPU: 1 UID: 0 PID: 172 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:smp_call_function_many_cond+0x1132/0x1500 kernel/smp.c:1002
Code: 78 44 8b 2b 44 89 ee 83 e6 01 31 ff e8 87 4e 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 72 49 0c 00 eb 35 f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 58 49 0c 00
RSP: 0018:ffffc90002e7f720 EFLAGS: 00000293
RAX: ffffffff81bbd5e8 RBX: ffff8880b8443708 RCX: ffff888021391f40
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90002e7f870 R08: ffffffff9179b37f R09: 1ffffffff22f366f
R10: dffffc0000000000 R11: fffffbfff22f3670 R12: 1ffff110170886e1
R13: dffffc0000000000 R14: 1ffff1100427269b R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff888123bd0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2a2e1ffffc CR3: 000000000fb48000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2641 [inline]
 smp_text_poke_batch_finish+0x5fd/0x1110 arch/x86/kernel/alternative.c:2851
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 static_key_enable_cpuslocked+0x128/0x240 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate+0xab/0x290 mm/kfence/core.c:902
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 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
 </TASK>

report is corrupted, running repro again
testing program (duration=6m0s, {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}}): socket$nl_route-sendmsg$nl_route_sched
detailed listing:
executing program 0:
r0 = socket$nl_route(0x10, 0x3, 0x0)
sendmsg$nl_route_sched(r0, &(0x7f00000009c0)={0x0, 0x0, &(0x7f0000000a00)={&(0x7f0000000a40)=@newqdisc={0xa4, 0x24, 0x605, 0x0, 0x0, {0x0, 0x0, 0x0, 0x2a, {0x0, 0x3}, {0xffff, 0xffff}}, [@qdisc_kind_options=@q_taprio={{0xb}, {0x74, 0x2, [@TCA_TAPRIO_ATTR_PRIOMAP={0x56, 0x1, {0x1, [], 0x0, [0x1, 0x56, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0xfffd], [0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x3]}}, @TCA_TAPRIO_ATTR_SCHED_ENTRY_LIST={0x10, 0x2, 0x0, 0x1, [{0xc, 0x1, 0x0, 0x1, [@TCA_TAPRIO_SCHED_ENTRY_INTERVAL={0x8, 0x4, 0x1000}]}]}, @TCA_TAPRIO_ATTR_SCHED_CLOCKID={0x8}]}}]}, 0xa4}}, 0x0)

program crashed: INFO: rcu detected stall in worker_thread
final repro crashed as (corrupted=false):
rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
rcu: 	1-...!: (1 GPs behind) idle=a28c/1/0x4000000000000000 softirq=17630/17669 fqs=0
rcu: 	(detected by 0, t=10508 jiffies, g=15361, q=1564 ncpus=2)
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 UID: 0 PID: 207 Comm: kworker/u8:6 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: writeback wb_workfn (flush-8:0)
RIP: 0010:check_wait_context kernel/locking/lockdep.c:4914 [inline]
RIP: 0010:__lock_acquire+0x51a/0x2de0 kernel/locking/lockdep.c:5238
Code: 41 8d 5c 24 01 49 ff cc 89 d9 83 c1 fe 78 41 45 89 e7 41 81 e7 ff ff ff 7f 83 f9 31 73 1d 4b 8d 0c bf 41 8b 8c ce d0 0b 00 00 <31> c1 ff cb 49 ff cc f7 c1 00 60 00 00 74 cf eb 18 48 c7 c7 d0 ab
RSP: 0018:ffffc90000a18b08 EFLAGS: 00000083
RAX: 82000000000c4000 RBX: 0000000000000006 RCX: 000000000006019b
RDX: 0000000000000002 RSI: 0000000000004000 RDI: 8200000000000000
RBP: ffff88802237ea60 R08: ffffffff84ec4947 R09: 0000000000000001
R10: ffffc90000a18d20 R11: fffff520001431a6 R12: 0000000000000004
R13: 0000000000000000 R14: ffff88802237ddc0 R15: 0000000000000004
FS:  0000000000000000(0000) GS:ffff888123bd0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9642bf12f8 CR3: 00000000737ee000 CR4: 00000000003526f0
Call Trace:
 <IRQ>
 lock_acquire+0x115/0x350 kernel/locking/lockdep.c:5942
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:155 [inline]
 _raw_spin_lock_irqsave+0x40/0x60 kernel/locking/spinlock.c:181
 debug_object_activate+0xb7/0x420 lib/debugobjects.c:873
 debug_hrtimer_activate kernel/time/hrtimer.c:486 [inline]
 debug_activate kernel/time/hrtimer.c:529 [inline]
 enqueue_hrtimer+0xa9/0x2c0 kernel/time/hrtimer.c:1136
 __run_hrtimer kernel/time/hrtimer.c:2090 [inline]
 __hrtimer_run_queues+0x4ce/0xa10 kernel/time/hrtimer.c:2131
 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2250
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1051 [inline]
 __sysvec_apic_timer_interrupt+0x102/0x430 arch/x86/kernel/apic/apic.c:1068
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa1/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:__get_pfnblock_flags_mask+0x1ab/0x210 mm/page_alloc.c:405
Code: 0f 00 49 8b 07 45 89 f7 41 c1 ef 06 41 83 e7 38 41 c1 ee 09 41 83 e6 38 49 01 c6 49 83 c6 18 4c 89 f0 48 c1 e8 03 80 3c 18 00 <74> 08 4c 89 f7 e8 8b 0a 0f 00 49 8b 06 44 89 f9 48 d3 e8 4c 21 e8
RSP: 0018:ffffc900030e69b0 EFLAGS: 00000246
RAX: 1ffff11027fc10bb RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000000000017 RSI: 000000000001fb30 RDI: ffffea00007ecc00
RBP: 0000000000100000 R08: dffffc0000000000 R09: 0000000000000000
R10: ffffed1003f66000 R11: fffffbfff22f3670 R12: 0000000000000060
R13: 0000000000000017 R14: ffff88813fe085d8 R15: 0000000000000028
 get_pfnblock_migratetype mm/page_alloc.c:447 [inline]
 __free_frozen_pages+0x727/0xd90 mm/page_alloc.c:2973
 __slab_free+0x274/0x2c0 mm/slub.c:5823
 qlink_free mm/kasan/quarantine.c:163 [inline]
 qlist_free_all+0x99/0x100 mm/kasan/quarantine.c:179
 kasan_quarantine_reduce+0x148/0x160 mm/kasan/quarantine.c:286
 __kasan_slab_alloc+0x22/0x80 mm/kasan/common.c:361
 kasan_slab_alloc include/linux/kasan.h:253 [inline]
 slab_post_alloc_hook mm/slub.c:4683 [inline]
 slab_alloc_node mm/slub.c:4996 [inline]
 kmem_cache_alloc_noprof+0x2b9/0x600 mm/slub.c:5010
 ext4_init_io_end+0x29/0x130 fs/ext4/page-io.c:302
 ext4_do_writepages+0xb59/0x4770 fs/ext4/inode.c:2879
 ext4_writepages+0x241/0x3b0 fs/ext4/inode.c:3032
 do_writepages+0x338/0x560 mm/page-writeback.c:2560
 __writeback_single_inode+0x136/0x1220 fs/fs-writeback.c:1803
 writeback_sb_inodes+0x9de/0x1b00 fs/fs-writeback.c:2114
 __writeback_inodes_wb+0x114/0x240 fs/fs-writeback.c:2190
 wb_writeback+0x42f/0xad0 fs/fs-writeback.c:2301
 wb_check_old_data_flush fs/fs-writeback.c:2405 [inline]
 wb_do_writeback fs/fs-writeback.c:2484 [inline]
 wb_workfn+0xc92/0x10f0 fs/fs-writeback.c:2512
 process_one_work kernel/workqueue.c:3396 [inline]
 process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3479
 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3560
 kthread+0x38b/0x480 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
 </TASK>
rcu: rcu_preempt kthread starved for 10508 jiffies! g15361 f0x0 RCU_GP_WAIT_FQS(5) ->state=R ->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:27496 pid:17    tgid:17    ppid:2      task_flags:0x208040 flags:0x00080000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:5533 [inline]
 __schedule+0x17db/0x58f0 kernel/sched/core.c:7284
 __schedule_loop kernel/sched/core.c:7361 [inline]
 schedule+0x164/0x2b0 kernel/sched/core.c:7376
 schedule_timeout+0x152/0x2c0 kernel/time/sleep_timeout.c:99
 rcu_gp_fqs_loop+0x30c/0x11f0 kernel/rcu/tree.c:2122
 rcu_gp_kthread+0x9e/0x2b0 kernel/rcu/tree.c:2330
 kthread+0x38b/0x480 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
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
CPU: 0 UID: 0 PID: 6014 Comm: syz.1.51 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:csd_lock kernel/smp.c:396 [inline]
RIP: 0010:smp_call_function_many_cond+0x61e/0x1500 kernel/smp.c:944
Code: b6 04 04 84 c0 0f 85 d5 03 00 00 44 8b 3b 44 89 fe 83 e6 01 31 ff e8 91 59 0c 00 41 83 e7 01 75 07 e8 86 54 0c 00 eb 3f f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 04 04 84 c0 75 0f f7 03 01
RSP: 0018:ffffc90003c07320 EFLAGS: 00000293
RAX: ffffffff81bbcade RBX: ffff8880b85414c8 RCX: ffff88807ce43e80
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90003c07470 R08: ffff88807ce4541f R09: 1ffff1100f9c8a83
R10: dffffc0000000000 R11: 0000000000000000 R12: 1ffff110170a8299
R13: 0000000000000001 R14: ffff8880b85414c0 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888123ad0000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fbfc2655ef0 CR3: 0000000076bac000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 __flush_tlb_multi arch/x86/include/asm/paravirt.h:46 [inline]
 flush_tlb_multi arch/x86/mm/tlb.c:1361 [inline]
 flush_tlb_mm_range+0x8ff/0x1090 arch/x86/mm/tlb.c:1435
 tlb_flush arch/x86/include/asm/tlb.h:23 [inline]
 tlb_flush_mmu_tlbonly include/asm-generic/tlb.h:509 [inline]
 tlb_flush_mmu+0x1af/0xa30 mm/mmu_gather.c:423
 tlb_finish_mmu+0xf4/0x220 mm/mmu_gather.c:549
 free_ldt_pgtables+0x192/0x360 arch/x86/kernel/ldt.c:411
 arch_exit_mmap arch/x86/include/asm/mmu_context.h:229 [inline]
 exit_mmap+0x1bf/0x9f0 mm/mmap.c:1300
 __mmput+0x118/0x420 kernel/fork.c:1193
 exit_mm+0x18e/0x240 kernel/exit.c:592
 do_exit+0x6cd/0x2360 kernel/exit.c:974
 do_group_exit+0x22d/0x2f0 kernel/exit.c:1129
 get_signal+0x121b/0x12c0 kernel/signal.c:3112
 arch_do_signal_or_restart+0xbb/0x860 arch/x86/kernel/signal.c:337
 __exit_to_user_mode_loop kernel/entry/common.c:66 [inline]
 exit_to_user_mode_loop+0x10e/0x770 kernel/entry/common.c:101
 __exit_to_user_mode_prepare include/linux/irq-entry-common.h:207 [inline]
 syscall_exit_to_user_mode_prepare include/linux/irq-entry-common.h:230 [inline]
 syscall_exit_to_user_mode include/linux/entry-common.h:343 [inline]
 do_syscall_64+0x328/0x520 arch/x86/entry/syscall_64.c:89
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f4ac979e1d9
Code: Unable to access opcode bytes at 0x7f4ac979e1af.
RSP: 002b:00007ffe7beb93c8 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: 00000000000000a4 RBX: 00007f4ac9a25fa0 RCX: 00007f4ac979e1d9
RDX: 0000000000000000 RSI: 00002000000009c0 RDI: 0000000000000003
RBP: 00007f4ac9835888 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f4ac9a25fac R14: 00007f4ac9a25fa0 R15: 00007f4ac9a25fa0
 </TASK>