watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.1.33268:21625]
Modules linked in:
CPU: 0 PID: 21625 Comm: syz.1.33268 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:memcpy_erms+0x8/0x10 arch/x86/lib/memcpy_64.S:56
Code: 00 cc eb 1e 0f 1f 00 48 89 f8 48 89 d1 48 c1 e9 03 83 e2 07 f3 48 a5 89 d1 f3 a4 c3 90 90 90 90 90 90 48 89 f8 48 89 d1 f3 a4 <c3> 90 90 90 90 90 90 90 48 89 f8 48 83 fa 20 72 7e 40 38 fe 7c 35
RSP: 0018:ffffc90000007c10 EFLAGS: 00000202
RAX: ffff88813d139842 RBX: 0000000000000006 RCX: 0000000000000000
RDX: 0000000000000006 RSI: ffff8881437a5a16 RDI: ffff88813d139848
RBP: ffffc90000007c40 R08: ffff88813d139847 R09: 1ffff11027a27308
R10: dffffc0000000000 R11: ffffed1027a27309 R12: 0000000000000000
R13: ffffffff8401b0bf R14: ffff8881437a5a10 R15: ffff88813d139842
FS:  00007f9fa513b6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f2e0c4a6990 CR3: 0000000145914000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000200000000300 DR2: 0000200000000300
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __ndisc_fill_addr_option net/ipv6/ndisc.c:158 [inline]
 ndisc_fill_addr_option net/ipv6/ndisc.c:170 [inline]
 ndisc_send_rs+0x61f/0x960 net/ipv6/ndisc.c:703
 addrconf_rs_timer+0x35a/0x600 net/ipv6/addrconf.c:3974
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1450
 expire_timers kernel/time/timer.c:1495 [inline]
 __run_timers+0x637/0x9a0 kernel/time/timer.c:1789
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1802
 __do_softirq+0x255/0x563 kernel/softirq.c:309
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_on_irqstack arch/x86/include/asm/irq_stack.h:26 [inline]
 run_on_irqstack_cond arch/x86/include/asm/irq_stack.h:77 [inline]
 do_softirq_own_stack+0x60/0x80 arch/x86/kernel/irq_64.c:77
 invoke_softirq kernel/softirq.c:405 [inline]
 __irq_exit_rcu+0x128/0x150 kernel/softirq.c:435
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:447
 sysvec_apic_timer_interrupt+0xbf/0xe0 arch/x86/kernel/apic/apic.c:1106
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:635
RIP: 0010:__raw_spin_unlock_irq include/linux/spinlock_api_smp.h:169 [inline]
RIP: 0010:_raw_spin_unlock_irq+0x49/0x70 kernel/locking/spinlock.c:199
Code: 12 48 89 fb 48 c7 c7 b0 73 4c 86 e8 01 41 1d fd 48 89 df 48 83 3d 56 8d ca 01 00 74 27 e8 f3 ef c9 fc 66 90 fb bf 01 00 00 00 <e8> 52 e9 c2 fc 65 8b 05 17 87 80 7b 85 c0 74 03 5b 5d c3 e8 03 87
RSP: 0018:ffffc90000cb7ab0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000040000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000cb7ab8 R08: ffffffff86c37993 R09: 1ffffffff0d86f32
R10: dffffc0000000000 R11: fffffbfff0d86f33 R12: ffff8881f7055fc0
R13: ffff8881410ba7ac R14: ffff888100060500 R15: ffff8881535e93c0
 finish_lock_switch kernel/sched/core.c:3786 [inline]
 finish_task_switch+0x12e/0x5a0 kernel/sched/core.c:3886
 context_switch kernel/sched/core.c:4051 [inline]
 __schedule+0xc0b/0x13e0 kernel/sched/core.c:4806
 preempt_schedule_common+0x9b/0xf0 kernel/sched/core.c:4965
 preempt_schedule+0xbc/0xd0 kernel/sched/core.c:4990
 preempt_schedule_thunk+0x16/0x18 arch/x86/entry/thunk_64.S:39
 __raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
 _raw_spin_unlock_irqrestore+0x74/0x80 kernel/locking/spinlock.c:191
 perf_unpin_context+0x4a/0x70 kernel/events/core.c:1556
 __do_sys_perf_event_open kernel/events/core.c:12281 [inline]
 __se_sys_perf_event_open+0x124e/0x1b40 kernel/events/core.c:11872
 __x64_sys_perf_event_open+0xbf/0xd0 kernel/events/core.c:11872
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f9fa66e20d9
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:00007f9fa513b028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f9fa6969fa0 RCX: 00007f9fa66e20d9
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000480
RBP: 00007f9fa6779024 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9fa696a038 R14: 00007f9fa6969fa0 R15: 00007ffefb1ebe98
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 21642 Comm: kworker/u4:5 Tainted: G        W         syzkaller #0
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:229 [inline]
RIP: 0010:smp_call_function_single+0x217/0x490 kernel/smp.c:517
Code: 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 ee 8c 0a 00 e9 a4 00 00 00 f3 90 f7 44 24 48 01 00 00 00 0f 84 8f 00 00 00 <e8> d4 8c 0a 00 eb e9 e8 ad 95 22 03 89 c3 41 89 c4 bf 08 00 00 00
RSP: 0018:ffffc9000104f700 EFLAGS: 00000202
RAX: ffffffff815a24ec RBX: 0000000000000000 RCX: ffff88812b9ea780
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000104f7f0 R08: ffffffff86c371ef R09: 1ffffffff0d86e3d
R10: dffffc0000000000 R11: fffffbfff0d86e3e R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff92000209ee4
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000563652278f28 CR3: 000000000640f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 smp_call_function_many_cond+0x8f5/0x9d0 kernel/smp.c:653
 smp_call_function_many kernel/smp.c:716 [inline]
 smp_call_function kernel/smp.c:738 [inline]
 on_each_cpu+0xab/0x180 kernel/smp.c:837
 text_poke_sync arch/x86/kernel/alternative.c:1568 [inline]
 text_poke_bp_batch+0x1cb/0x5f0 arch/x86/kernel/alternative.c:1768
 text_poke_flush arch/x86/kernel/alternative.c:1959 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1966
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:126
 __jump_label_update+0x38f/0x3b0 kernel/jump_label.c:459
 jump_label_update+0x34c/0x3e0 kernel/jump_label.c:825
 static_key_enable_cpuslocked+0x126/0x240 kernel/jump_label.c:177
 static_key_enable+0x1a/0x30 kernel/jump_label.c:190
 toggle_allocation_gate+0xba/0x440 mm/kfence/core.c:624
 process_one_work+0x6fd/0xbc0 kernel/workqueue.c:2301
 worker_thread+0xa8e/0x13c0 kernel/workqueue.c:2447
 kthread+0x324/0x3b0 kernel/kthread.c:313
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:298