syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 246s! [syz.8.1121:4720]
Modules linked in:
CPU: 0 PID: 4720 Comm: syz.8.1121 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
RIP: 0010:queued_write_lock_slowpath+0x11b/0x396 kernel/locking/qrwlock.c:85
Code: f0 41 81 0f 00 01 00 00 42 0f b6 04 23 84 c0 74 37 44 89 f9 80 e1 07 80 c1 03 38 c1 7c 2a 4c 89 ff e8 79 0b c0 fc eb 20 f3 90 <42> 0f b6 04 23 84 c0 74 15 44 89 f9 80 e1 07 80 c1 03 38 c1 7c 08
RSP: 0018:ffffc90000007440 EFLAGS: 00000206
RAX: 00000000000001ff RBX: 1ffffffff0ebfb96 RCX: ffffffff84f49841
RDX: 0000000000000001 RSI: 0000000000000004 RDI: ffffffff875fdcb0
RBP: ffffc900000074f0 R08: dffffc0000000000 R09: fffffbfff0ebfb97
R10: fffffbfff0ebfb97 R11: 1ffffffff0ebfb96 R12: dffffc0000000000
R13: ffffc90000007490 R14: ffffffff875fdcb4 R15: ffffffff875fdcb0
FS:  00007f2c2eea96c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001230c5000 CR4: 00000000003506b0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 queued_write_lock include/asm-generic/qrwlock.h:101 [inline]
 __raw_write_lock_bh include/linux/rwlock_api_smp.h:203 [inline]
 _raw_write_lock_bh+0xd6/0xe0 kernel/locking/spinlock.c:334
 ___neigh_create+0xda7/0x1e20 net/core/neighbour.c:682
 __neigh_create+0x31/0x40 net/core/neighbour.c:737
 ip6_finish_output2+0xa4f/0x1870 net/ipv6/ip6_output.c:129
 __ip6_finish_output net/ipv6/ip6_output.c:205 [inline]
 ip6_finish_output+0x5f9/0xbb0 net/ipv6/ip6_output.c:216
 NF_HOOK_COND include/linux/netfilter.h:294 [inline]
 ip6_output+0x1d1/0x3b0 net/ipv6/ip6_output.c:237
 dst_output include/net/dst.h:453 [inline]
 NF_HOOK include/linux/netfilter.h:305 [inline]
 ndisc_send_skb+0x7e3/0xcf0 net/ipv6/ndisc.c:513
 ndisc_send_rs+0x670/0x870 net/ipv6/ndisc.c:723
 addrconf_rs_timer+0x2c7/0x600 net/ipv6/addrconf.c:4005
 call_timer_fn+0x46/0x2a0 kernel/time/timer.c:1553
 expire_timers kernel/time/timer.c:1604 [inline]
 __run_timers+0x644/0x9b0 kernel/time/timer.c:1875
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1888
 handle_softirqs+0x1d7/0x600 kernel/softirq.c:642
 __do_softirq kernel/softirq.c:680 [inline]
 invoke_softirq kernel/softirq.c:497 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:csd_lock_wait kernel/smp.c:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x872/0x960 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 99 65 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 65 61 09 00 e9 38 ff ff ff f3 90 <41> 0f b6 44 1d 00 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 1a ff ff
RSP: 0018:ffffc90000ff77a0 EFLAGS: 00000246
RAX: ffffffff8166c93e RBX: dffffc0000000000 RCX: 0000000000080000
RDX: ffffc90005289000 RSI: 000000000007ffff RDI: 0000000000080000
RBP: ffffc90000ff78d8 R08: dffffc0000000000 R09: ffffed103ee0721b
R10: 0000000000000000 R11: ffffffff81343830 R12: 1ffff1103ee07218
R13: 1ffff1103ee278a5 R14: 0000000000000001 R15: ffff8881f713c528
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1165
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1574 [inline]
 text_poke_bp_batch+0x1cc/0x580 arch/x86/kernel/alternative.c:1774
 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1972
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146
 __jump_label_update+0x37c/0x3a0 kernel/jump_label.c:451
 jump_label_update+0x39b/0x450 kernel/jump_label.c:797
 static_key_slow_inc_cpuslocked+0x1c0/0x300 kernel/jump_label.c:140
 static_key_slow_inc+0x1a/0x30 kernel/jump_label.c:155
 perf_swevent_init+0x3a8/0x650 kernel/events/core.c:9888
 perf_try_init_event+0x15b/0x450 kernel/events/core.c:11546
 perf_init_event kernel/events/core.c:11623 [inline]
 perf_event_alloc+0x119b/0x1970 kernel/events/core.c:11901
 __do_sys_perf_event_open kernel/events/core.c:12437 [inline]
 __se_sys_perf_event_open+0x6c5/0x1b80 kernel/events/core.c:12329
 __x64_sys_perf_event_open+0xbf/0xd0 kernel/events/core.c:12329
 x64_sys_call+0x385/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:299
 do_syscall_x64 arch/x86/entry/common.c:51 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:81
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f2c2df8f749
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f2c2eea9038 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007f2c2e1e6090 RCX: 00007f2c2df8f749
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000100
RBP: 00007f2c2e013f91 R08: 0000000000000001 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007f2c2e1e6128 R14: 00007f2c2e1e6090 R15: 00007ffe07b09328
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 352 Comm: kworker/1:3 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Workqueue: events_power_efficient neigh_periodic_work
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0xcc/0x140 arch/x86/kernel/kvm.c:1058
Code: 20 f6 44 24 21 02 75 24 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 48 0f b6 07 40 38 f0 75 a6 66 90 0f 00 2d 55 96 13 04 f4 <eb> 9a fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc9000de9f440 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff8881f7127a80 RCX: ffffffff84f48de2
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff8881f7127a80
RBP: ffffc9000de9f4d0 R08: dffffc0000000000 R09: ffffed103ee24f51
R10: ffffed103ee24f51 R11: 1ffff1103ee24f50 R12: 1ffff1103ee20001
R13: ffff8881f7138cd4 R14: dffffc0000000000 R15: 1ffff92001bd3e88
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001230c5000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000200000000300 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x690/0xc40 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:134 [inline]
 _raw_spin_lock+0xd8/0xe0 kernel/locking/spinlock.c:154
 krc_this_cpu_lock kernel/rcu/tree.c:3035 [inline]
 add_ptr_to_bulk_krc_lock kernel/rcu/tree.c:3355 [inline]
 kvfree_call_rcu+0x100/0x7a0 kernel/rcu/tree.c:3446
 trie_delete_elem+0x572/0x720 kernel/bpf/lpm_trie.c:545
 bpf_prog_41385012b43a9f2e+0x40/0x44
 bpf_dispatcher_nop_func include/linux/bpf.h:987 [inline]
 __bpf_prog_run include/linux/filter.h:603 [inline]
 bpf_prog_run include/linux/filter.h:610 [inline]
 __bpf_trace_run kernel/trace/bpf_trace.c:2283 [inline]
 bpf_trace_run3+0x113/0x270 kernel/trace/bpf_trace.c:2323
 __bpf_trace_timer_start+0x2b/0x40 include/trace/events/timer.h:53
 trace_timer_start include/trace/events/timer.h:53 [inline]
 enqueue_timer+0x337/0x480 kernel/time/timer.c:615
 __mod_timer+0x84a/0xbf0 kernel/time/timer.c:-1
 add_timer+0x68/0x80 kernel/time/timer.c:1250
 __queue_delayed_work+0x173/0x200 kernel/workqueue.c:1686
 mod_delayed_work_on+0x74/0xe0 kernel/workqueue.c:1749
 mod_delayed_work include/linux/workqueue.h:540 [inline]
 schedule_delayed_monitor_work kernel/rcu/tree.c:3213 [inline]
 kvfree_call_rcu+0x560/0x7a0 kernel/rcu/tree.c:3472
 neigh_destroy+0x476/0x5b0 net/core/neighbour.c:918
 neigh_release include/net/neighbour.h:455 [inline]
 neigh_cleanup_and_release+0x76/0x1a0 net/core/neighbour.c:103
 neigh_periodic_work+0x9c6/0xbc0 net/core/neighbour.c:1005
 process_one_work+0x71f/0xc40 kernel/workqueue.c:2302
 worker_thread+0xa29/0x11f0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>