watchdog: BUG: soft lockup - CPU#1 stuck for 143s! [syz.6.120:607]
Modules linked in:
CPU: 1 PID: 607 Comm: syz.6.120 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
RIP: 0010:arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
RIP: 0010:kvm_wait+0x105/0x150 arch/x86/kernel/kvm.c:918
Code: 11 d6 03 f4 eb 87 fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07 40 38 f0 75 10 66 90 0f 00 2d 1d 11 d6 03 fb f4 <e9> 5e ff ff ff fb e9 58 ff ff ff e8 cb 0f 7e 03 89 f9 80 e1 07 38
RSP: 0018:ffffc90000ce75a0 EFLAGS: 00000246
RAX: 0000000000000003 RBX: ffff8881085f7a04 RCX: ffffffff815013fc
RDX: 0000000000000001 RSI: 0000000000000003 RDI: ffff8881085f7a04
RBP: ffffc90000ce7630 R08: ffff8881085f7a04 R09: 1ffff110210bef40
R10: dffffc0000000000 R11: ffffed10210bef41 R12: ffff88823ff52f80
R13: dffffc0000000000 R14: dffffc0000000000 R15: 1ffff9200019ceb4
FS:  000055557214c500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000110f46000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:597 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x605/0x9b0 kernel/locking/qspinlock.c:508
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:585 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:85 [inline]
 do_raw_spin_lock include/linux/spinlock.h:188 [inline]
 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline]
 _raw_spin_lock+0xe4/0xf0 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:364 [inline]
 unqueue_me kernel/futex/core.c:2559 [inline]
 futex_wait+0x274/0x8f0 kernel/futex/core.c:2982
 do_futex+0xdb1/0x2800 kernel/futex/core.c:4031
 __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: 0033:0x7f7b6f79d159
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:00007fff50327d38 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 0000000000039b51 RCX: 00007f7b6f79d159
RDX: 0000000000000000 RSI: 0000000000000080 RDI: 00007f7b6fa24fac
RBP: 0000000000000032 R08: 0015080ca661f248 R09: 0000000000000000
R10: 00007fff50327e40 R11: 0000000000000246 R12: 00007fff50327e60
R13: 00007f7b6fa24fac R14: 0000000000039b83 R15: 00007fff50327e40
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 608 Comm: syz.6.120 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 09/16/2026
RIP: 0010:unwind_done arch/x86/include/asm/unwind.h:46 [inline]
RIP: 0010:unwind_get_return_address+0x16/0x90 arch/x86/kernel/unwind_frame.c:16
Code: 48 c7 c7 80 72 6d 86 e8 18 9b 77 00 eb a1 00 00 cc cc 00 00 55 48 89 e5 41 57 41 56 53 48 89 fb 49 be 00 00 00 00 00 fc ff df <48> 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 48 83 3b 00 74 3a 48
RSP: 0018:ffffc90000007158 EFLAGS: 00000006
RAX: ffffffff8100f8d0 RBX: ffffc900000071e0 RCX: ffff888119416400
RDX: 0000000000010100 RSI: 1ffff92000000e3d RDI: ffffc900000071e0
RBP: ffffc90000007170 R08: ffffc90000007201 R09: ffffc900000071e0
R10: dffffc0000000000 R11: fffff52000000e48 R12: dffffc0000000000
R13: ffffc900000071e0 R14: dffffc0000000000 R15: 1ffff92000000e61
FS:  00007f7b6f5fe6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000000 CR3: 0000000110f46000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 perf_callchain_kernel+0x2ea/0x6c0 arch/x86/events/core.c:2784
 get_perf_callchain+0x356/0x460 kernel/events/callchain.c:200
 perf_callchain kernel/events/core.c:7491 [inline]
 perf_prepare_sample+0x352/0x1a30 kernel/events/core.c:7518
 __perf_event_output kernel/events/core.c:7687 [inline]
 perf_event_output_forward+0xd1/0x1a0 kernel/events/core.c:7707
 __perf_event_overflow+0x215/0x3d0 kernel/events/core.c:9375
 perf_swevent_overflow kernel/events/core.c:9451 [inline]
 perf_swevent_event+0x2f5/0x540 kernel/events/core.c:-1
 perf_tp_event+0x324/0xa30 kernel/events/core.c:9907
 perf_trace_run_bpf_submit+0xf3/0x1c0 kernel/events/core.c:9881
 perf_trace_signal_generate+0x41a/0x5d0 include/trace/events/signal.h:50
 trace_signal_generate include/trace/events/signal.h:50 [inline]
 __send_signal+0xc8c/0xce0 kernel/signal.c:1193
 send_signal+0x4a6/0x5d0 kernel/signal.c:1258
 do_send_sig_info+0xd6/0x210 kernel/signal.c:1307
 group_send_sig_info+0x11a/0x410 kernel/signal.c:1464
 do_bpf_send_signal+0x82/0x150 kernel/trace/bpf_trace.c:779
 irq_work_single kernel/irq_work.c:155 [inline]
 irq_work_run_list+0x178/0x240 kernel/irq_work.c:177
 irq_work_run+0x6a/0xf0 kernel/irq_work.c:186
 __sysvec_irq_work+0x63/0x1a0 arch/x86/kernel/irq_work.c:22
 instr_sysvec_irq_work arch/x86/kernel/irq_work.c:17 [inline]
 sysvec_irq_work+0x50/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x1b/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:ffs arch/x86/include/asm/bitops.h:297 [inline]
RIP: 0010:handle_softirqs+0x10d/0x560 kernel/softirq.c:571
Code: 08 85 e8 96 2c 70 03 65 66 c7 05 9c 36 c4 7e 00 00 48 c7 c7 20 2c 08 85 e8 80 2c 70 03 65 44 89 35 e0 38 c3 7e fb 44 89 75 a4 <b8> ff ff ff ff 0f bc 45 a4 41 89 c5 41 ff c5 0f 85 c0 00 00 00 48
RSP: 0018:ffffc90000007f38 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffff888119410282 RCX: 47bc676c8dd10100
RDX: 1ffffffff0e18c00 RSI: ffffffff85082c20 RDI: ffffffff85639540
RBP: ffffc90000007fc0 R08: ffffffff870c6008 R09: ffffffff870c6018
R10: ffffffff870c6003 R11: 1ffffffff0e18c00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000282 R15: 000000000000000a
 __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:match_futex kernel/futex/core.c:439 [inline]
RIP: 0010:futex_wake+0x361/0x8f0 kernel/futex/core.c:1688
Code: 7c 4a 00 48 8b 1b 4c 8b 64 24 48 48 89 df 4c 89 e6 e8 53 fe 0a 00 4c 39 e3 0f 85 41 01 00 00 49 8d 5f 30 48 89 d8 48 c1 e8 03 <42> 0f b6 04 28 84 c0 0f 85 4f 01 00 00 8b 1b 89 df 4c 8b 64 24 38
RSP: 0018:ffffc90000ae78a0 EFLAGS: 00000a06
RAX: 1ffff9200019cf27 RBX: ffffc90000ce7938 RCX: ffff888119416400
RDX: 0000000000000000 RSI: ffff888131c5aa00 RDI: ffff888131c5aa00
RBP: ffffc90000ae79d0 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200015cf04 R12: ffff888131c5aa00
R13: dffffc0000000000 R14: ffff8881085f7a08 R15: ffffc90000ce7908
 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: 0033:0x7f7b6f79d159
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:00007f7b6f5fe0e8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: ffffffffffffffda RBX: 00007f7b6fa24fa8 RCX: 00007f7b6f79d159
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f7b6fa24fac
RBP: 00007f7b6fa24fa0 R08: 0015080ca661f248 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f7b6fa25038 R14: 00007fff50327af0 R15: 00007fff50327bd8
 </TASK>