watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.0.33683:13784]
Modules linked in:
CPU: 0 PID: 13784 Comm: syz.0.33683 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:ndisc_send_rs+0x0/0x960 net/ipv6/ndisc.c:660
Code: 1f fc ff ff 89 f9 80 e1 07 38 c1 0f 8c 3a fc ff ff e8 c4 1b 9d fd e9 30 fc ff ff 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 <55> 48 89 e5 41 57 41 56 41 55 41 54 53 48 83 ec 38 48 89 55 a0 48
RSP: 0018:ffffc90000007cb8 EFLAGS: 00000246
RAX: ffffffff83fd43fb RBX: ffff888119a75268 RCX: 0000000000000102
RDX: ffffffff857505e0 RSI: ffffc90000007d00 RDI: ffff88816d280000
RBP: ffffc90000007d78 R08: ffff888119a75103 R09: 1ffff1102334ea20
R10: dffffc0000000000 R11: ffffed102334ea21 R12: ffffc90000007d00
R13: ffff88816d280000 R14: 1ffff92000000f9c R15: 0000000000000000
FS:  00007f84d872d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000123765000 CR4: 00000000003506b0
DR0: 0000200000000280 DR1: 0000200000000280 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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:__rcu_read_unlock+0x34/0xa0 kernel/rcu/tree_plugin.h:396
Code: be 00 00 00 00 00 fc ff df 65 48 8b 3d 85 d0 af 7e 48 8d 9f 08 04 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 2e ff 0b <75> 1c 48 8d 9f 0c 04 00 00 48 89 d8 48 c1 e8 03 42 0f b6 04 30 84
RSP: 0018:ffffc90001b17578 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888124dd8408 RCX: ffff888124dd8000
RDX: 0000000000000000 RSI: 00000000ffffffe4 RDI: ffff888124dd8000
RBP: ffffc90001b17590 R08: ffffc90001b17517 R09: ffffc90001b17500
R10: dffffc0000000000 R11: fffff52000362ea3 R12: 1ffff92000362eb4
R13: 00000000ffffffe4 R14: dffffc0000000000 R15: ffffc90001b177c0
 rcu_read_unlock include/linux/rcupdate.h:771 [inline]
 __perf_event_output kernel/events/core.c:7427 [inline]
 perf_event_output_forward+0x12e/0x1a0 kernel/events/core.c:7436
 __perf_event_overflow+0x19d/0x350 kernel/events/core.c:9092
 perf_swevent_overflow kernel/events/core.c:9168 [inline]
 perf_swevent_event+0x4b9/0x540 kernel/events/core.c:9206
 perf_tp_event+0x316/0x9f0 kernel/events/core.c:9624
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:9598
 perf_trace_msr_trace_class+0x2b0/0x360 arch/x86/include/asm/msr-trace.h:21
 trace_write_msr arch/x86/include/asm/msr-trace.h:45 [inline]
 do_trace_write_msr+0xb7/0x100 arch/x86/lib/msr.c:119
 native_write_msr arch/x86/include/asm/msr.h:163 [inline]
 wrmsr arch/x86/include/asm/msr.h:273 [inline]
 native_apic_msr_write+0x49/0x50 arch/x86/include/asm/apic.h:208
 apic_write arch/x86/include/asm/apic.h:396 [inline]
 x2apic_send_IPI_self+0x5e/0x70 arch/x86/kernel/apic/x2apic_phys.c:155
 arch_irq_work_raise+0x86/0xd0 arch/x86/kernel/irq_work.c:31
 __irq_work_queue_local+0x115/0x190 kernel/irq_work.c:-1
 irq_work_queue+0x9e/0x150 kernel/irq_work.c:75
 __kfence_alloc+0x129/0x180 mm/kfence/core.c:770
 kfence_alloc include/linux/kfence.h:124 [inline]
 slab_alloc_node mm/slub.c:2877 [inline]
 slab_alloc mm/slub.c:2960 [inline]
 kmem_cache_alloc_trace+0x247/0x2e0 mm/slub.c:2977
 kmalloc include/linux/slab.h:555 [inline]
 kzalloc include/linux/slab.h:667 [inline]
 selinux_perf_event_alloc+0x51/0x140 security/selinux/hooks.c:6993
 security_perf_event_alloc+0x62/0x90 security/security.c:2588
 perf_event_alloc+0x149c/0x19b0 kernel/events/core.c:11558
 __do_sys_perf_event_open kernel/events/core.c:11986 [inline]
 __se_sys_perf_event_open+0x717/0x1b40 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: 0033:0x7f84d9d371d9
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:00007f84d872d028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f84d9fbf270 RCX: 00007f84d9d371d9
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00002000000009c0
RBP: 00007f84d9dce888 R08: 000000000000000a R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f84d9fbf308 R14: 00007f84d9fbf270 R15: 00007fffbe96e048
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 2741 Comm: kworker/u4:3 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
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:ffffc900012a7700 EFLAGS: 00000293
RAX: ffffffff815a2c0c RBX: 0000000000000000 RCX: ffff88813ce7a800
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900012a77f0 R08: ffffffff86c3766f R09: 1ffffffff0d86ecd
R10: dffffc0000000000 R11: fffffbfff0d86ece R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff92000254ee4
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6d994a1000 CR3: 000000000640f000 CR4: 00000000003506a0
DR0: 0000200000000280 DR1: 0000200000000300 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