watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [kworker/u4:6:9489]
Modules linked in:
CPU: 0 PID: 9489 Comm: kworker/u4:6 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x8c3/0x9f0 kernel/smp.c:969
Code: 84 c0 0f 85 9d 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 90 37 0a 00 83 e3 01 48 8b 5c 24 10 75 07 e8 d1 33 0a 00 eb 42 f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 75 10 41 f7
RSP: 0018:ffffc90000bc7860 EFLAGS: 00000293
RAX: ffffffff815e8b05 RBX: ffff8881f7038e80 RCX: ffff888127e6e2c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000bc7978 R08: dffffc0000000000 R09: ffffed103ee071d3
R10: ffffed103ee071d3 R11: 1ffff1103ee071d2 R12: 1ffff1103ee071d0
R13: 1ffff1103ee2784d R14: 0000000000000001 R15: ffff8881f713c268
FS: 0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000299000 CR3: 000000000660f000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1135
on_each_cpu include/linux/smp.h:71 [inline]
text_poke_sync arch/x86/kernel/alternative.c:1442 [inline]
text_poke_bp_batch+0x1cd/0x5a0 arch/x86/kernel/alternative.c:1642
text_poke_flush arch/x86/kernel/alternative.c:1833 [inline]
text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1840
arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146
__jump_label_update+0x37c/0x3a0 kernel/jump_label.c:459
jump_label_update+0x39b/0x450 kernel/jump_label.c:830
static_key_enable_cpuslocked+0x126/0x240 kernel/jump_label.c:177
static_key_enable+0x1a/0x30 kernel/jump_label.c:190
toggle_allocation_gate+0xb4/0x410 mm/kfence/core.c:766
process_one_work+0x6be/0xba0 kernel/workqueue.c:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 14294 Comm: syz.0.3832 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 08/18/2025
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0xcc/0x140 arch/x86/kernel/kvm.c:912
Code: 20 f6 44 24 21 02 75 24 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 48 0f b6 07 40 38 f0 75 a6 66 90 0f 00 2d e5 91 d6 03 f4 9a fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc90000bf73e0 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881002f9cac RCX: ffffffff814f4259
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8881002f9cac
RBP: ffffc90000bf7470 R08: dffffc0000000000 R09: ffffed102005f396
R10: ffffed102005f396 R11: 1ffff1102005f395 R12: 1ffff1103ee20001
R13: ffff8881f7138ad4 R14: dffffc0000000000 R15: 1ffff9200017ee7c
FS: 00007fd59527c6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000139605000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
__pv_queued_spin_lock_slowpath+0x60f/0x9c0 kernel/locking/qspinlock.c:508
pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
do_raw_spin_lock include/linux/spinlock.h:187 [inline]
__raw_spin_lock_irq include/linux/spinlock_api_smp.h:129 [inline]
_raw_spin_lock_irq+0xd9/0xe0 kernel/locking/spinlock.c:170
get_wchan kernel/sched/core.c:2021 [inline]
perf_trace_sched_blocked_reason+0x243/0x4a0 include/trace/events/sched.h:490
trace_sched_blocked_reason include/trace/events/sched.h:490 [inline]
try_to_wake_up+0xea1/0x1160 kernel/sched/core.c:4190
wake_up_process kernel/sched/core.c:4348 [inline]
wake_up_q+0xdf/0x1c0 kernel/sched/core.c:975
rt_mutex_wake_up_q kernel/locking/rtmutex.c:520 [inline]
rt_mutex_postunlock kernel/locking/rtmutex_api.c:464 [inline]
rt_mutex_futex_unlock+0xf7/0x180 kernel/locking/rtmutex_api.c:182
rcu_preempt_deferred_qs_irqrestore+0x708/0x9d0 kernel/rcu/tree_plugin.h:566
rcu_read_unlock_special+0xab/0x460 kernel/rcu/tree_plugin.h:673
__rcu_read_unlock+0x5e/0xa0 kernel/rcu/tree_plugin.h:422
rcu_read_unlock include/linux/rcupdate.h:780 [inline]
bpf_test_timer_leave net/bpf/test_run.c:51 [inline]
bpf_test_run+0x858/0x8d0 net/bpf/test_run.c:122
bpf_prog_test_run_skb+0x9ec/0x1150 net/bpf/test_run.c:669
bpf_prog_test_run+0x3d5/0x620 kernel/bpf/syscall.c:3348
__sys_bpf+0x52c/0x730 kernel/bpf/syscall.c:4651
__do_sys_bpf kernel/bpf/syscall.c:4737 [inline]
__se_sys_bpf kernel/bpf/syscall.c:4735 [inline]
__x64_sys_bpf+0x7c/0x90 kernel/bpf/syscall.c:4735
x64_sys_call+0x4b9/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:322
do_syscall_x64 arch/x86/entry/common.c:50 [inline]
do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7fd596813ba9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fd59527c038 EFLAGS: 00000246 ORIG_RAX: 0000000000000141
RAX: ffffffffffffffda RBX: 00007fd596a5afa0 RCX: 00007fd596813ba9
RDX: 000000000000004c RSI: 0000200000000240 RDI: 000000000000000a
RBP: 00007fd596896e19 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fd596a5b038 R14: 00007fd596a5afa0 R15: 00007ffd3e099d48