RBP: 00007ffa5209c8b0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa5228d128 R14: 00007ffa5228d090 R15: 00007ffdf80989e8
watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.5.585:2786]
Modules linked in:
CPU: 0 PID: 2786 Comm: syz.5.585 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:perf_swevent_event+0x532/0x540 kernel/events/core.c:9207
Code: 75 13 4d 85 e4 74 0e e8 1c 99 e1 ff eb c4 e8 15 99 e1 ff eb 0c e8 0e 99 e1 ff eb 05 e8 07 99 e1 ff 48 83 c4 28 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 0f 1f 84 00 00 00 00 00 55 48 89 e5 41 57 41 56
RSP: 0018:ffffc900000076a0 EFLAGS: 00000286
RAX: ffffffff81831bce RBX: ffff8881f70532f0 RCX: ffff88811b74e400
RDX: 0000000000000103 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc900000076b0 R08: ffff88810ebb91f7 R09: 1ffff11021d7723e
R10: dffffc0000000000 R11: ffffed1021d7723f R12: 1ffff1103ee0a65e
R13: ffff88810eb19800 R14: 1ffff11021d6333d R15: 0000000000000006
FS:  00007ffa50a3d6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffa509d9ff8 CR3: 0000000117000000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 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+0x23c/0x2d0 mm/slub.c:2965
 kmem_cache_alloc_node include/linux/slab.h:426 [inline]
 __alloc_skb+0x9e/0x520 net/core/skbuff.c:200
 alloc_skb include/linux/skbuff.h:1126 [inline]
 ndisc_alloc_skb net/ipv6/ndisc.c:422 [inline]
 ndisc_send_rs+0x310/0x960 net/ipv6/ndisc.c:691
 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:preempt_count_sub+0x0/0x170 kernel/sched/core.c:4483
Code: 86 80 e1 07 80 c1 03 38 c1 0f 8c 6e ff ff ff 48 c7 c7 c8 a9 c3 86 e8 1f 6a 5a 00 89 df e9 5b ff ff ff 0f 1f 84 00 00 00 00 00 <55> 48 89 e5 41 56 53 48 bb 00 00 00 00 00 fc ff df 48 c7 c0 c0 18
RSP: 0018:ffffc90000cb7b18 EFLAGS: 00000293
RAX: ffffffff815a2a22 RBX: 0000000000000000 RCX: ffff88811b74e400
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000cb7c10 R08: ffff88811b74e407 R09: 1ffff110236e9c80
R10: dffffc0000000000 R11: ffffed10236e9c81 R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000000 R15: 1ffff92000196f68
 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: 0033:0x7ffa52005559
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:00007ffa50a3d028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007ffa5228d090 RCX: 00007ffa52005559
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000300
RBP: 00007ffa5209c8b0 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffa5228d128 R14: 00007ffa5228d090 R15: 00007ffdf80989e8
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7 Comm: kworker/u4:0 Not tainted 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:ffffc90000077700 EFLAGS: 00000293
RAX: ffffffff815a2a3c RBX: 0000000000000000 RCX: ffff88810024bc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900000777f0 R08: ffffffff86c379ef R09: 1ffffffff0d86f3d
R10: dffffc0000000000 R11: fffffbfff0d86f3e R12: dffffc0000000000
R13: 0000000000000001 R14: 0000000000000001 R15: 1ffff9200000eee4
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f3a833f3000 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_disable_cpuslocked+0xc5/0x1a0 kernel/jump_label.c:207
 static_key_disable+0x1a/0x30 kernel/jump_label.c:215
 toggle_allocation_gate+0x3a5/0x440 mm/kfence/core.c:638
 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