watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.6.32520:7676]
Modules linked in:
CPU: 0 PID: 7676 Comm: syz.6.32520 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
RIP: 0010:nf_hook_slow+0x137/0x1f0 net/netfilter/core.c:583
Code: a2 fd eb 05 e8 5a 8c a2 fd 49 be 00 00 00 00 00 fc ff df 48 8b 45 b8 42 0f b6 04 30 84 c0 75 21 49 ff c4 48 8b 45 d0 0f b7 00 <49> 39 c4 73 69 e8 2f 8c a2 fd 49 83 c5 10 49 83 c7 10 e9 30 ff ff
RSP: 0018:ffffc90000007a08 EFLAGS: 00000206
RAX: 0000000000000004 RBX: 0000000000000001 RCX: ffff888157f66400
RDX: 0000000000000101 RSI: ffffffff86affac0 RDI: 0000000000000001
RBP: ffffc90000007a50 R08: ffff888157f66400 R09: 0000000000000003
R10: 0000000000000003 R11: 0000000000000101 R12: 0000000000000003
R13: ffff88811b121b28 R14: dffffc0000000000 R15: ffff88811b121b30
FS:  00007f7d8a3646c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f7d8a301d58 CR3: 0000000170c43000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 nf_hook include/linux/netfilter.h:254 [inline]
 NF_HOOK include/linux/netfilter.h:297 [inline]
 ndisc_send_skb+0xb5e/0xbc0 net/ipv6/ndisc.c:513
 ndisc_send_rs+0x711/0x960 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x35a/0x600 net/ipv6/addrconf.c:3982
 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:native_restore_fl arch/x86/include/asm/irqflags.h:41 [inline]
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/irqflags.h:84 [inline]
RIP: 0010:generic_exec_single+0x152/0x370 kernel/smp.c:296
Code: c7 44 24 40 00 00 00 00 9c 8f 44 24 40 48 8b 5c 24 40 43 c6 44 3d 04 f8 fa 4c 89 f7 ff 54 24 10 48 89 5c 24 18 ff 74 24 18 9d <31> c0 e9 38 01 00 00 44 8b 3d d0 57 69 05 44 89 f7 44 89 fe e8 25
RSP: 0018:ffffc90000c97a60 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 0000000000000246 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000ffffffff
RBP: ffffc90000c97b10 R08: ffff888157f66407 R09: 1ffff1102afecc80
R10: dffffc0000000000 R11: ffffed102afecc81 R12: ffffc90000c97b68
R13: 1ffff92000192f50 R14: ffffc90000c97ca0 R15: dffffc0000000000
 smp_call_function_single+0x1d9/0x490 kernel/smp.c:514
 task_function_call kernel/events/core.c:116 [inline]
 perf_install_in_context+0x4c7/0x770 kernel/events/core.c:2969
 __do_sys_perf_event_open kernel/events/core.c:12286 [inline]
 __se_sys_perf_event_open+0x1246/0x1b40 kernel/events/core.c:11878
 __x64_sys_perf_event_open+0xbf/0xd0 kernel/events/core.c:11878
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f7d8b94eb19
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:00007f7d8a364028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f7d8bbd5180 RCX: 00007f7d8b94eb19
RDX: ffefffffffffffff RSI: 0000000000000000 RDI: 0000200000000700
RBP: 00007f7d8b9e6b70 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7d8bbd5218 R14: 00007f7d8bbd5180 R15: 00007fffb337dda8
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 9 Comm: kworker/u4:1 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/15/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:229 [inline]
RIP: 0010:smp_call_function_single+0x209/0x490 kernel/smp.c:517
Code: 48 44 89 f6 83 e6 01 31 ff e8 63 90 0a 00 41 83 e6 01 49 bc 00 00 00 00 00 fc ff df 75 0a e8 9e 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 84 8c 0a 00 eb e9 e8
RSP: 0018:ffffc90000097700 EFLAGS: 00000293
RAX: ffffffff815a2a3c RBX: 0000000000000000 RCX: ffff88810024d000
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900000977f0 R08: ffffffff86c383ef R09: 1ffffffff0d8707d
R10: dffffc0000000000 R11: fffffbfff0d8707e R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff92000012ee4
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f62ed655000 CR3: 000000000640f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000200000000dc0 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