watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [syz.2.19:378]
Modules linked in:
CPU: 0 PID: 378 Comm: syz.2.19 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x56/0x80 kernel/locking/spinlock.c:194
Code: 47 6d 86 e8 4c a7 f4 fc 4c 89 f7 48 83 3d d9 b0 b8 01 00 74 31 e8 ae 60 9b fc 66 90 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a5 2e 93 fc 65 8b 05 06 d7 4d 7b 85 c0 74 05 5b 41 5e 5d c3 e8
RSP: 0018:ffffc90000007ca8 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000a02 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000a02 RDI: 0000000000000001
RBP: ffffc90000007cb8 R08: ffff8881f7138ec7 R09: 1ffff1103ee271d8
R10: dffffc0000000000 R11: ffffed103ee271d9 R12: 0000000000000a02
R13: 0000000000000020 R14: ffff8881f7100000 R15: ffff8881003bd7ec
FS:  00007f3c0e3056c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000122635000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 try_to_wake_up+0x5d2/0x1150 kernel/sched/core.c:4279
 wake_up_process+0x10/0x20 kernel/sched/core.c:4348
 process_timeout+0x38/0x40 kernel/time/timer.c:1849
 call_timer_fn+0x38/0x290 kernel/time/timer.c:1459
 expire_timers kernel/time/timer.c:1504 [inline]
 __run_timers+0x637/0x9a0 kernel/time/timer.c:1775
 run_timer_softirq+0x6a/0xf0 kernel/time/timer.c:1788
 handle_softirqs+0x250/0x560 kernel/softirq.c:583
 __do_softirq kernel/softirq.c:621 [inline]
 invoke_softirq kernel/softirq.c:443 [inline]
 __irq_exit_rcu+0x52/0xf0 kernel/softirq.c:670
 irq_exit_rcu+0x9/0x10 kernel/softirq.c:682
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1108 [inline]
 sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1108
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0010:__raw_spin_unlock_irqrestore include/linux/spinlock_api_smp.h:161 [inline]
RIP: 0010:_raw_spin_unlock_irqrestore+0x56/0x80 kernel/locking/spinlock.c:194
Code: 47 6d 86 e8 4c a7 f4 fc 4c 89 f7 48 83 3d d9 b0 b8 01 00 74 31 e8 ae 60 9b fc 66 90 f7 c3 00 02 00 00 74 01 fb bf 01 00 00 00 <e8> a5 2e 93 fc 65 8b 05 06 d7 4d 7b 85 c0 74 05 5b 41 5e 5d c3 e8
RSP: 0018:ffffc90000b777d8 EFLAGS: 00000206
RAX: 0000000000000001 RBX: 0000000000000a06 RCX: dffffc0000000000
RDX: 0000000000000001 RSI: 0000000000000a06 RDI: 0000000000000001
RBP: ffffc90000b777e8 R08: ffff8881f7138ec7 R09: 1ffff1103ee271d8
R10: dffffc0000000000 R11: ffffed103ee271d9 R12: 0000000000000a06
R13: 0000000000000000 R14: ffff8881f7100000 R15: ffff88810d7657ec
 try_to_wake_up+0x5d2/0x1150 kernel/sched/core.c:4279
 wake_up_process kernel/sched/core.c:4348 [inline]
 wake_up_q+0xda/0x1b0 kernel/sched/core.c:975
 futex_wake+0x63a/0x8f0 kernel/futex/core.c:1706
 do_futex+0xd8d/0x2800 kernel/futex/core.c:4036
 __do_sys_futex kernel/futex/core.c:4108 [inline]
 __se_sys_futex+0x135/0x330 kernel/futex/core.c:4089
 __x64_sys_futex+0xe5/0x100 kernel/futex/core.c:4089
 x64_sys_call+0x251/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:203
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f3c0e4a4159
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:00007f3c0e3050e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f3c0e72bfa8 RCX: 00007f3c0e4a4159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f3c0e72bfac
RBP: 00007f3c0e72bfa0 R08: 0036b90cf6cfdf5c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f3c0e72c038 R14: 00007fff632020d0 R15: 00007fff632021b8
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 34 Comm: kcompactd0 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:try_to_del_timer_sync kernel/time/timer.c:1263 [inline]
RIP: 0010:del_timer_sync+0xe4/0x1a0 kernel/time/timer.c:1421
Code: 28 00 74 08 4c 89 ff e8 4a ca 4e 00 49 39 1f 74 07 e8 40 54 0f 00 eb 54 4c 8d 7d c8 48 8b 75 c8 4c 89 f7 e8 ae 22 5a 03 f3 90 <48> c7 45 c8 00 00 00 00 48 89 df 4c 89 fe e8 29 f8 ff ff 49 89 c6
RSP: 0018:ffffc9000023fa78 EFLAGS: 00000286
RAX: 0000000080000000 RBX: ffffc9000023fae0 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000a02 RDI: 00000000ffffffff
RBP: ffffc9000023fab0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000047f30 R12: ffff8881f7027908
R13: dffffc0000000000 R14: ffff8881f7027900 R15: ffffc9000023fa78
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f5243e7f000 CR3: 000000012411e000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 schedule_timeout+0x161/0x340 kernel/time/timer.c:1923
 freezable_schedule_timeout include/linux/freezer.h:217 [inline]
 kcompactd+0xa0e/0x18c0 mm/compaction.c:3013
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>