watchdog: BUG: soft lockup - CPU#0 stuck for 123s! [syz.4.189:1130]
Modules linked in:
CPU: 0 PID: 1130 Comm: syz.4.189 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
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 a6 c5 6f 03 65 66 c7 05 9c 40 c4 7e 00 00 48 c7 c7 20 2c 08 85 e8 90 c5 6f 03 65 44 89 35 a0 42 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: 0000:ffffc90000007f38 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffff8881179d0080 RCX: fcc4c9f72478cb00
RDX: 1ffffffff0e18a00 RSI: ffffffff85082c20 RDI: ffffffff85638e80
RBP: ffffc90000007fc0 R08: ffffffff870c5008 R09: ffffffff870c5018
R10: ffffffff870c5003 R11: 1ffffffff0e18a00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000080 R15: 000000000000000a
FS:  00007f25927df6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000001 CR3: 00000001dfa5a000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Call Trace:
 <IRQ>
 __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:preempt_schedule_irq+0xa5/0x120 kernel/sched/core.c:6942
Code: 44 24 20 00 02 00 00 43 c6 44 37 04 f8 74 0b 0f 0b 48 f7 03 08 00 00 00 74 4d bf 01 00 00 00 e8 71 8c 94 fc fb bf 01 00 00 00 <e8> 76 e4 ff ff fa bf 01 00 00 00 e8 0b 8e 94 fc 65 48 8b 1d 63 36
RSP: 0000:ffffc90000be7d60 EFLAGS: 00000246
RAX: 1ffff11022f3a646 RBX: ffffc90000be7e28 RCX: ffffffff870ccf00
RDX: 1ffffffff0e18a00 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90000be7dd8 R08: ffffffff870c5008 R09: ffffffff870c5018
R10: ffffffff870c5003 R11: 1ffffffff0e18a00 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff9200017cfac
 irqentry_exit_cond_resched+0x29/0x30 kernel/entry/common.c:398
 irqentry_exit+0x37/0x40 kernel/entry/common.c:432
 sysvec_irq_work+0x61/0xc0 arch/x86/kernel/irq_work.c:17
 asm_sysvec_irq_work+0x1b/0x20 arch/x86/include/asm/idtentry.h:713
RIP: 0010:exit_to_user_mode_loop+0x49/0xe0 kernel/entry/common.c:168
Code: 53 00 e8 9a 79 e8 00 fa e8 a4 7d 55 03 65 48 8b 05 5c f7 a8 7e 4c 8b 30 41 f7 c6 0e 30 02 00 0f 84 91 00 00 00 fb 41 f6 c6 08 <74> 05 e8 e0 b9 59 03 41 f7 c6 00 10 00 00 74 08 48 89 df e8 0f c0
RSP: 0000:ffffc90000be7ed0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffffc90000be7f58 RCX: fcc4c9f72478cb00
RDX: 1ffffffff0e18a00 RSI: 0000000000000008 RDI: ffffc90000be7f58
RBP: ffffc90000be7ee0 R08: ffffffff870c5008 R09: ffffffff870c5018
R10: ffffffff870c5003 R11: 1ffffffff0e18a00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000008 R15: ffff8881179d2780
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 irqentry_exit_to_user_mode+0x9/0x10 kernel/entry/common.c:320
 irqentry_exit+0x12/0x40 kernel/entry/common.c:411
 sysvec_apic_timer_interrupt+0x64/0xc0 arch/x86/kernel/apic/apic.c:1108
 asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:676
RIP: 0033:0x7f2593dc66d0
Code: 83 c0 16 83 e0 f7 74 12 50 48 8d 3d aa 2c 07 00 e8 65 65 f9 ff 0f 1f 44 00 00 c3 66 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 <83> ff 21 74 0b c3 66 2e 0f 1f 84 00 00 00 00 00 55 53 48 89 f3 48
RSP: 002b:00007f25927deb38 EFLAGS: 00000246
RAX: 0000000000000000 RBX: 00007f259402f098 RCX: 00007f2593da7159
RDX: 00007f25927deb40 RSI: 00007f25927dec70 RDI: 0000000000000021
RBP: 00007f259402f090 R08: 000cfe76259d494c R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f259402f128 R14: 00007fff02882f80 R15: 00007fff02883068
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1 skipped: idling at native_safe_halt arch/x86/include/asm/irqflags.h:51 [inline]
NMI backtrace for cpu 1 skipped: idling at arch_safe_halt arch/x86/include/asm/irqflags.h:89 [inline]
NMI backtrace for cpu 1 skipped: idling at default_idle+0xf/0x20 arch/x86/kernel/process.c:729