syzbot

watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.0.30062:13633]
Modules linked in:
CPU: 0 PID: 13633 Comm: syz.0.30062 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:IS_ERR include/linux/err.h:36 [inline]
RIP: 0010:ndisc_send_skb+0x282/0xbc0 net/ipv6/ndisc.c:494
Code: e8 c3 49 02 00 42 80 3c 3b 00 4c 8b 74 24 60 74 08 4c 89 f7 e8 4f ce 9d fd 49 8b 3e 4c 89 e6 e8 44 c3 fc ff 48 3d 01 f0 ff ff <4c> 8b 74 24 68 72 3b e8 f2 57 63 fd e8 fd 48 51 fd 48 8b 7c 24 20
RSP: 0018:ffffc90000007a60 EFLAGS: 00000293
RAX: ffff88810cf76780 RBX: 1ffff110219e671a RCX: ffff8881361213c0
RDX: 0000000000000101 RSI: 00000000ffffffff RDI: 00000000ffffffff
RBP: ffffc90000007c40 R08: ffffc9000000792f R09: ffffc90000007920
R10: dffffc0000000000 R11: fffff52000000f26 R12: ffffc90000007b50
R13: ffff88811a378c38 R14: ffff88810cf338d0 R15: dffffc0000000000
FS:  00007f52d6b7a6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000002 CR3: 000000011ed6e000 CR4: 00000000003506b0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 ndisc_send_rs+0x711/0x960 net/ipv6/ndisc.c:707
 addrconf_rs_timer+0x35a/0x600 net/ipv6/addrconf.c:3968
 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 b0 73 4c 86 e8 01 8f 1d fd 48 89 df 48 83 3d 66 ea ca 01 00 74 27 e8 03 4a ca fc 66 90 fb bf 01 00 00 00 <e8> 02 46 c3 fc 65 8b 05 27 e4 80 7b 85 c0 74 03 5b 5d c3 e8 13 e4
RSP: 0018:ffffc90000d87bf8 EFLAGS: 00000246
RAX: 0000000000000001 RBX: 000000001c000004 RCX: dffffc0000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000d87c00 R08: ffffc90000d87e1f R09: 1ffff920001b0fc3
R10: dffffc0000000000 R11: fffff520001b0fc4 R12: 1ffff110222f8c8c
R13: dffffc0000000000 R14: 0000000000000000 R15: 0000000000000021
 spin_unlock_irq include/linux/spinlock.h:405 [inline]
 get_signal+0x1233/0x1300 kernel/signal.c:2796
 arch_do_signal_or_restart+0xe7/0x11b0 arch/x86/kernel/signal.c:805
 handle_signal_work kernel/entry/common.c:145 [inline]
 exit_to_user_mode_loop+0xa2/0xe0 kernel/entry/common.c:169
 exit_to_user_mode_prepare+0x76/0xa0 kernel/entry/common.c:199
 syscall_exit_to_user_mode+0x1d/0x40 kernel/entry/common.c:274
 do_syscall_64+0x3d/0x40 arch/x86/entry/common.c:56
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f52d8161e59
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:00007f52d6b7a028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: 0000000000000000 RBX: 00007f52d83db180 RCX: 00007f52d8161e59
RDX: 0000000000000009 RSI: 0000000040042408 RDI: 000000000000000a
RBP: 00007f52d81f7e6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f52d83db218 R14: 00007f52d83db180 R15: 00007fff3d54e6e8
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 13632 Comm: syz.0.30062 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/09/2026
RIP: 0010:arch_static_branch arch/x86/include/asm/jump_label.h:25 [inline]
RIP: 0010:static_key_false include/linux/jump_label.h:221 [inline]
RIP: 0010:native_write_msr arch/x86/include/asm/msr.h:162 [inline]
RIP: 0010:wrmsrl arch/x86/include/asm/msr.h:281 [inline]
RIP: 0010:lapic_next_deadline+0x25/0x40 arch/x86/kernel/apic/apic.c:479
Code: 00 00 0f 1f 00 55 48 89 e5 0f ae f0 0f ae e8 0f 31 48 c1 e2 20 48 09 c2 48 8d 04 fa 48 89 c2 48 c1 ea 20 b9 e0 06 00 00 0f 30 <0f> 1f 44 00 00 31 c0 5d c3 bf e0 06 00 00 48 89 c6 31 d2 e8 83 f8
RSP: 0018:ffffc90000170e58 EFLAGS: 00000002
RAX: 0000062c57688da9 RBX: ffff8881f7126e80 RCX: 00000000000006e0
RDX: 000000000000062c RSI: ffff8881f7126e80 RDI: 0000000000000221
RBP: ffffc90000170e58 R08: ffff88812545e2c0 R09: 0000000000000002
R10: 0000000000000003 R11: 0000000080010001 R12: ffff8881f7126ea8
R13: ffff8881f7126e88 R14: 0000000000000000 R15: 0000000000000221
FS:  00007f52d6b9b6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000001 CR3: 000000011ed6e000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 clockevents_program_event+0x1e9/0x8e0 kernel/time/clockevents.c:334
 tick_program_event+0xa3/0x120 kernel/time/tick-oneshot.c:44
 hrtimer_interrupt+0x368/0xc80 kernel/time/hrtimer.c:1726
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1095 [inline]
 __sysvec_apic_timer_interrupt+0xfa/0x3f0 arch/x86/kernel/apic/apic.c:1112
 asm_call_irq_on_stack+0xf/0x20
 </IRQ>
 __run_sysvec_on_irqstack arch/x86/include/asm/irq_stack.h:37 [inline]
 run_sysvec_on_irqstack_cond arch/x86/include/asm/irq_stack.h:89 [inline]
 sysvec_apic_timer_interrupt+0x85/0xe0 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 b0 73 4c 86 e8 01 8f 1d fd 48 89 df 48 83 3d 66 ea ca 01 00 74 27 e8 03 4a ca fc 66 90 fb bf 01 00 00 00 <e8> 02 46 c3 fc 65 8b 05 27 e4 80 7b 85 c0 74 03 5b 5d c3 e8 13 e4
RSP: 0018:ffffc90001037c70 EFLAGS: 00000246
RAX: 0000000000000001 RBX: ffff88812545eaa8 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000008 RDI: 0000000000000001
RBP: ffffc90001037c78 R08: ffff88812545e2c7 R09: 1ffff11024a8bc58
R10: dffffc0000000000 R11: ffffed1024a8bc59 R12: dffffc0000000000
R13: ffffc90001037ec0 R14: 0000000000000000 R15: ffff88812545eaa0
 spin_unlock_irq include/linux/spinlock.h:405 [inline]
 __set_current_blocked+0x208/0x230 kernel/signal.c:2979
 set_current_blocked+0x3a/0x40 kernel/signal.c:2963
 __ia32_sys_rt_sigreturn+0x16b/0x730 arch/x86/kernel/signal.c:667
 do_syscall_64+0x31/0x40 arch/x86/entry/common.c:46
 entry_SYSCALL_64_after_hwframe+0x61/0xcb
RIP: 0033:0x7f52d81031d9
Code: 11 06 00 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 c7 c0 0f 00 00 00 0f 05 <0f> 1f 80 00 00 00 00 48 81 ec 48 01 00 00 49 89 d0 64 48 8b 0c 25
RSP: 002b:00007f52d6b9ab40 EFLAGS: 00000206 ORIG_RAX: 000000000000000f
RAX: ffffffffffffffda RBX: 00007f52d83db098 RCX: 00007f52d81031d9
RDX: 00007f52d6b9ab40 RSI: 00007f52d6b9ac70 RDI: 0000000000000021
RBP: 00007f52d83db090 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000206 R12: 0000000000000000
R13: 00007f52d83db128 R14: 00007fff3d54e600 R15: 00007fff3d54e6e8