watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.5.31705:3660]
Modules linked in:
CPU: 0 PID: 3660 Comm: syz.5.31705 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:rt6_uncached_list_add net/ipv6/route.c:138 [inline]
RIP: 0010:icmp6_dst_alloc+0x4e6/0x700 net/ipv6/route.c:3192
Code: ff df 80 3c 08 00 74 08 4c 89 f7 e8 e4 1f a0 fd 48 89 df 4c 89 ee 41 ff 16 49 89 c5 4d 85 ed 0f 85 f6 fe ff ff e8 ea 91 65 fd <49> c7 c6 00 7a 05 00 65 4c 03 35 73 ec 02 7c 49 81 c7 d8 00 00 00
RSP: 0018:ffffc90000007960 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff888105781dc0 RCX: dffffc0000000000
RDX: 0000000000000102 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000007a50 R08: ffff888105781dd7 R09: 1ffff11020af03ba
R10: dffffc0000000000 R11: ffffed1020af03bb R12: 1ffff92000000f38
R13: ffff88823ff3efdc R14: ffff888121a241e8 R15: ffff888105781dc0
FS:  00007febd32746c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000110752000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000200000000180
DR3: 0000200000000180 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ndisc_send_skb+0x27c/0xbc0 net/ipv6/ndisc.c:493
 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:__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 70 73 4c 86 e8 91 3a 1c fd 48 89 df 48 83 3d 56 69 c9 01 00 74 27 e8 83 ce c8 fc 66 90 fb bf 01 00 00 00 <e8> 52 c7 c1 fc 65 8b 05 57 63 7f 7b 85 c0 74 03 5b 5d c3 e8 43 63
RSP: 0018:ffffc9000128f8b0 EFLAGS: 00000246
RAX: 0000000000000001 RBX: dffffc0000000000 RCX: dffffc0000000000
RDX: 0000000040000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc9000128f8b8 R08: ffffffff86c38b93 R09: 1ffffffff0d87172
R10: dffffc0000000000 R11: fffffbfff0d87173 R12: ffff8881f7056000
R13: ffff888134d6502c R14: 0000000000000000 R15: ffff88810f249400
 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
 smp_call_function_single+0x3f7/0x490 kernel/smp.c:519
 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: 0033:0x7febd481c559
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:00007febd3274028 EFLAGS: 00000246 ORIG_RAX: 000000000000012a
RAX: ffffffffffffffda RBX: 00007febd4aa2fa0 RCX: 00007febd481c559
RDX: ffffffffffffffff RSI: 0000000000000000 RDI: 0000200000000400
RBP: 00007febd48b3b20 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffffffffffff R11: 0000000000000246 R12: 0000000000000000
R13: 00007febd4aa3038 R14: 00007febd4aa2fa0 R15: 00007fff91066d08
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 7 Comm: kworker/u4:0 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:ffffc90000077700 EFLAGS: 00000293
RAX: ffffffff815a2a3c RBX: 0000000000000000 RCX: ffff888100249400
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900000777f0 R08: ffffffff86c383ef R09: 1ffffffff0d8707d
R10: dffffc0000000000 R11: fffffbfff0d8707e 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: 00007f928a3ef000 CR3: 000000000640f000 CR4: 00000000003506a0
DR0: 0000200000000c80 DR1: 0000200000000180 DR2: 0000200000000180
DR3: 0000200000000180 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