watchdog: BUG: soft lockup - CPU#1 stuck for 174s! [kworker/u8:9:3016] Modules linked in: irq event stamp: 627415 hardirqs last enabled at (627414): [] seqcount_lockdep_reader_access include/linux/seqlock.h:75 [inline] hardirqs last enabled at (627414): [] read_seqbegin+0xac/0x180 include/linux/seqlock.h:838 hardirqs last disabled at (627415): [] sysvec_apic_timer_interrupt+0xe/0xc0 arch/x86/kernel/apic/apic.c:1062 softirqs last enabled at (620852): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last enabled at (620852): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last enabled at (620852): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 softirqs last disabled at (621025): [] __do_softirq kernel/softirq.c:703 [inline] softirqs last disabled at (621025): [] invoke_softirq kernel/softirq.c:542 [inline] softirqs last disabled at (621025): [] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 CPU: 1 UID: 0 PID: 3016 Comm: kworker/u8:9 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 Workqueue: events_unbound toggle_allocation_gate RIP: 0010:debug_lockdep_rcu_enabled+0xd/0x40 kernel/rcu/update.c:320 Code: 8e 67 48 0f b9 3a 90 eb bc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 31 c0 83 3d fb 1a ba 05 00 <74> 1d 83 3d ea 48 ba 05 00 74 14 65 48 8b 0d f8 13 dd 08 31 c0 83 RSP: 0018:ffffc90000a07ec8 EFLAGS: 00000202 RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000300 RDX: ffff888032ea8000 RSI: 0000000000000001 RDI: 0000000000000000 RBP: ffffc90000a07fd8 R08: 0000000000000100 R09: 0000000000000000 R10: dffffc0000000000 R11: fffff91fffe68c05 R12: ffffc90000a07f60 R13: dffffc0000000000 R14: 1ffff92000140fe8 R15: ffffffff90025e08 FS: 0000000000000000(0000) GS:ffff888123513000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f44a815a670 CR3: 000000006f86c000 CR4: 00000000003526f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: rcu_read_lock_held_common kernel/rcu/update.c:105 [inline] rcu_read_lock_held+0xa/0x50 kernel/rcu/update.c:349 trace_call_bpf+0x1a4/0xb80 kernel/trace/bpf_trace.c:147 perf_trace_run_bpf_submit+0x78/0x170 kernel/events/core.c:11524 do_perf_trace_lock include/trace/events/lock.h:49 [inline] perf_trace_lock+0x32e/0x410 include/trace/events/lock.h:49 __do_trace_lock_release include/trace/events/lock.h:68 [inline] trace_lock_release include/trace/events/lock.h:68 [inline] lock_release+0x396/0x3c0 kernel/locking/lockdep.c:5954 rcu_lock_release include/linux/rcupdate.h:319 [inline] rcu_read_unlock include/linux/rcupdate.h:880 [inline] class_rcu_destructor include/linux/rcupdate.h:1216 [inline] unwind_next_frame+0x1baa/0x2550 arch/x86/kernel/unwind_orc.c:709 arch_stack_walk+0x11b/0x150 arch/x86/kernel/stacktrace.c:25 stack_trace_save+0xa9/0x100 kernel/stacktrace.c:122 kasan_save_stack+0x3e/0x60 mm/kasan/common.c:57 kasan_record_aux_stack+0xbd/0xd0 mm/kasan/generic.c:556 __call_rcu_common kernel/rcu/tree.c:3287 [inline] call_rcu+0x86/0x300 kernel/rcu/tree.c:3395 refdst_drop include/net/dst.h:272 [inline] skb_dst_drop include/net/dst.h:284 [inline] __dev_queue_xmit+0x4cb/0x3920 net/core/dev.c:5033 NF_HOOK_COND include/linux/netfilter.h:314 [inline] ip6_output+0x337/0x540 net/ipv6/ip6_output.c:248 dst_output include/net/dst.h:472 [inline] NF_HOOK include/linux/netfilter.h:325 [inline] ndisc_send_skb+0xcb2/0x1650 net/ipv6/ndisc.c:513 addrconf_rs_timer+0x2d2/0x6c0 net/ipv6/addrconf.c:4098 call_timer_fn+0x18d/0x5f0 kernel/time/timer.c:1749 expire_timers kernel/time/timer.c:1800 [inline] __run_timers kernel/time/timer.c:2375 [inline] __run_timer_base+0x652/0x8b0 kernel/time/timer.c:2387 run_timer_base kernel/time/timer.c:2396 [inline] run_timer_softirq+0xb7/0x170 kernel/time/timer.c:2406 handle_softirqs+0x265/0x8d0 kernel/softirq.c:669 __do_softirq kernel/softirq.c:703 [inline] invoke_softirq kernel/softirq.c:542 [inline] __irq_exit_rcu+0xc6/0x220 kernel/softirq.c:786 irq_exit_rcu+0x9/0x30 kernel/softirq.c:809 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline] sysvec_apic_timer_interrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1062 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:kasan_check_range+0x1ce/0x2c0 mm/kasan/generic.c:200 Code: 49 8d 5c 24 07 4d 85 e4 49 0f 49 dc 48 83 e3 f8 49 29 dc 74 0e 41 80 3b 00 75 7c 49 ff c3 49 ff cc 75 f2 5b 41 5c 41 5d 41 5e <41> 5f 5d e9 da db c6 09 cc 45 84 ff 0f 85 a1 00 00 00 41 f7 c7 00 RSP: 0018:ffffc9000dedf700 EFLAGS: 00000256 RAX: 1ffff110065d5001 RBX: ffff88807a138000 RCX: ffffffff81a3a245 RDX: 0000000000000000 RSI: 0000000000000008 RDI: ffffffff8fffd080 RBP: dffffc0000000000 R08: ffffffff8fffd087 R09: 1ffffffff1fffa10 R10: dffffc0000000000 R11: fffffbfff1fffa11 R12: ffffffff8fffd080 R13: ffffffff8fffd108 R14: ffffffff8fffd0d0 R15: 1ffffffff1fffa10 instrument_atomic_read include/linux/instrumented.h:82 [inline] atomic_long_read include/linux/atomic/atomic-instrumented.h:3188 [inline] __mutex_owner kernel/locking/mutex.h:48 [inline] mutex_spin_on_owner+0x245/0x310 kernel/locking/mutex.c:392 mutex_optimistic_spin kernel/locking/mutex.c:509 [inline] __mutex_lock_common kernel/locking/mutex.c:650 [inline] __mutex_lock+0x2e1/0x15a0 kernel/locking/mutex.c:821 arch_jump_label_transform_queue+0x5f/0x110 arch/x86/kernel/jump_label.c:136 __jump_label_update+0x189/0x370 kernel/jump_label.c:513 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:3495 [inline] process_scheduled_works+0xc3d/0x1630 kernel/workqueue.c:3578 worker_thread+0xa47/0xfb0 kernel/workqueue.c:3659 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 Sending NMI from CPU 1 to CPUs 0: NMI backtrace for cpu 0 CPU: 0 UID: 0 PID: 8293 Comm: syz.0.701 Not tainted syzkaller #0 PREEMPT(full) Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/07/2026 RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x0/0xb0 kernel/kcov.c:327 Code: 08 03 00 00 00 4a 89 7c 01 10 4a 89 74 01 18 4a 89 44 01 20 c3 cc cc cc cc cc 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 0f 1e fa 48 8b 04 24 65 48 8b 15 f8 a7 17 13 65 48 8b 0d f8 a7 RSP: 0018:ffffc90000007b38 EFLAGS: 00000006 RAX: 0000000000000000 RBX: 000000000000002c RCX: 0000000001000003 RDX: 0000000001000001 RSI: 0000000000000000 RDI: 0000000000000008 RBP: 0000000000000002 R08: 0000000001000001 R09: 0000000000000004 R10: dffffc0000000000 R11: fffff52000000f8c R12: 0000000000000000 R13: 0000000000000000 R14: ffffc90000007be0 R15: 0000000000000150 FS: 00007f44a63f66c0(0000) GS:ffff888123413000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f0d27c86ba0 CR3: 00000000583da000 CR4: 00000000003526f0 DR0: 00002000000005c0 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600 Call Trace: perf_trace_buf_alloc+0xb5/0x280 kernel/trace/trace_event_perf.c:415 do_perf_trace_lock include/trace/events/lock.h:49 [inline] perf_trace_lock+0x1a1/0x410 include/trace/events/lock.h:49 __do_trace_lock_release include/trace/events/lock.h:68 [inline] trace_lock_release include/trace/events/lock.h:68 [inline] lock_release+0x396/0x3c0 kernel/locking/lockdep.c:5954 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:208 [inline] _raw_spin_unlock_irqrestore+0x1b/0x80 kernel/locking/spinlock.c:221 debug_object_activate+0x2ec/0x420 lib/debugobjects.c:891 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:1137 __run_hrtimer kernel/time/hrtimer.c:2091 [inline] __hrtimer_run_queues+0x4ce/0xa10 kernel/time/hrtimer.c:2132 hrtimer_interrupt+0x4cd/0xaa0 kernel/time/hrtimer.c:2251 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 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674 RIP: 0010:csd_lock_wait kernel/smp.c:389 [inline] RIP: 0010:smp_call_function_many_cond+0x1132/0x1500 kernel/smp.c:1028 Code: 78 44 8b 2b 44 89 ee 83 e6 01 31 ff e8 47 6f 0c 00 41 83 e5 01 49 bd 00 00 00 00 00 fc ff df 75 07 e8 22 6a 0c 00 eb 35 f3 90 <43> 0f b6 04 2c 84 c0 75 0f f7 03 01 00 00 00 74 1d e8 08 6a 0c 00 RSP: 0018:ffffc90005757480 EFLAGS: 00000246 RAX: ffffffff81bcb8e8 RBX: ffff8880b8341d88 RCX: 0000000000080000 RDX: ffffc90003e41000 RSI: 000000000007ffff RDI: 0000000000080000 RBP: ffffc900057575d0 R08: ffffffff91bdd5bf R09: 1ffffffff237bab7 R10: dffffc0000000000 R11: fffffbfff237bab8 R12: 1ffff110170683b1 R13: dffffc0000000000 R14: 1ffff1100f4272b3 R15: 0000000000000001 on_each_cpu include/linux/smp.h:71 [inline] smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2642 [inline] smp_text_poke_batch_finish+0xb22/0x1110 arch/x86/kernel/alternative.c:2914 __static_call_transform+0x51f/0x770 arch/x86/kernel/static_call.c:142 arch_static_call_transform+0x98/0xc0 arch/x86/kernel/static_call.c:-1 __static_call_update+0xf2/0x620 kernel/static_call_inline.c:147 tracepoint_update_call kernel/tracepoint.c:280 [inline] tracepoint_add_func+0x8b2/0xa90 kernel/tracepoint.c:323 tracepoint_probe_register_prio kernel/tracepoint.c:475 [inline] tracepoint_probe_register+0x5d/0x90 kernel/tracepoint.c:495 perf_trace_event_reg kernel/trace/trace_event_perf.c:129 [inline] perf_trace_event_init+0x4b3/0x880 kernel/trace/trace_event_perf.c:202 perf_trace_init+0x23d/0x2d0 kernel/trace/trace_event_perf.c:226 perf_tp_event_init+0x8d/0x120 kernel/events/core.c:11465 perf_try_init_event+0x162/0x970 kernel/events/core.c:13228 perf_init_event kernel/events/core.c:13332 [inline] perf_event_alloc+0x1452/0x2e30 kernel/events/core.c:13607 __do_sys_perf_event_open kernel/events/core.c:14152 [inline] __se_sys_perf_event_open+0x866/0x1ee0 kernel/events/core.c:14031 do_syscall_x64 arch/x86/entry/syscall_64.c:61 [inline] do_syscall_64+0x166/0x520 arch/x86/entry/syscall_64.c:84 entry_SYSCALL_64_after_hwframe+0x77/0x7f RIP: 0033:0x7f44a819f559 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:00007f44a63f6028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a RAX: ffffffffffffffda RBX: 00007f44a8425fa0 RCX: 00007f44a819f559 RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 00002000000003c0 RBP: 00007f44a8236b50 R08: 0000000000000000 R09: 0000000000000000 R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000 R13: 00007f44a8426038 R14: 00007f44a8425fa0 R15: 00007ffeb15dd548