watchdog: BUG: soft lockup - CPU#0 stuck for 226s! [syz.2.315:1490]
Modules linked in:
CPU: 0 PID: 1490 Comm: syz.2.315 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 76 85 6f 03 65 66 c7 05 6c 40 c4 7e 00 00 48 c7 c7 60 2c 08 85 e8 60 85 6f 03 65 44 89 35 70 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: 0018:ffffc90000007f38 EFLAGS: 00000282
RAX: 0000000000000000 RBX: ffff8881111f0002 RCX: fb11b0a5713a8500
RDX: 1ffffffff0e18a00 RSI: ffffffff85082c60 RDI: ffffffff85638d40
RBP: ffffc90000007fc0 R08: ffffffff870c5008 R09: ffffffff870c5018
R10: ffffffff870c5003 R11: 1ffffffff0e18a00 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000002 R15: 000000000000000a
FS:  00007f0f14fff6c0(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000002 CR3: 000000013c601000 CR4: 00000000003506b0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 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:uprobe_deny_signal+0x70/0x220 kernel/events/uprobes.c:1977
Code: f6 74 27 4d 8d 7e 20 4c 89 f8 48 c1 e8 03 42 80 3c 20 00 74 08 4c 89 ff e8 7d 08 1a 00 49 83 3f 00 75 19 e8 f2 93 da ff eb 05 <e8> eb 93 da ff 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 4d 89 f5 49
RSP: 0018:ffffc90000bb7bc0 EFLAGS: 00000246
RAX: 1ffff1102223e661 RBX: ffff8881111f2780 RCX: 0000000000080000
RDX: ffffc900023af000 RSI: 0000000000042071 RDI: 0000000000042072
RBP: ffffc90000bb7be8 R08: ffffc90000bb7e37 R09: ffffc90000bb7de0
R10: dffffc0000000000 R11: fffff52000176fc7 R12: dffffc0000000000
R13: dffffc0000000000 R14: 0000000000000000 R15: ffffc90000bb7f58
 get_signal+0xb5/0x1430 kernel/signal.c:2702
 arch_do_signal_or_restart+0xe2/0x1100 arch/x86/kernel/signal.c:867
 handle_signal_work kernel/entry/common.c:154 [inline]
 exit_to_user_mode_loop+0xa7/0xe0 kernel/entry/common.c:178
 exit_to_user_mode_prepare+0x87/0xd0 kernel/entry/common.c:214
 __syscall_exit_to_user_mode_work kernel/entry/common.c:296 [inline]
 syscall_exit_to_user_mode+0x1a/0x30 kernel/entry/common.c:307
 do_syscall_64+0x58/0xa0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x66/0xd0
RIP: 0033:0x7f0f165a6159
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:00007f0f14ffefd8 EFLAGS: 00000202 ORIG_RAX: 0000000000000038
RAX: 0000000000000101 RBX: 00007f0f1682dfa0 RCX: 00007f0f165a6159
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 00000000c0126080
RBP: 00007f0f1663d03b R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000
R13: 00007f0f1682e038 R14: 00007f0f1682dfa0 R15: 00007ffdc8297598
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 313 Comm: kworker/u4:4 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x8ad/0x9e0 kernel/smp.c:969
Code: 0f b6 44 05 00 84 c0 0f 85 9b 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 a1 53 0a 00 83 e3 01 75 07 e8 e7 4f 0a 00 eb 42 f3 90 <48> b8 00 00 00 00 00 fc ff df 41 0f b6 44 05 00 84 c0 75 10 41 f7
RSP: 0018:ffffc90007847860 EFLAGS: 00000293
RAX: ffffffff815f77cf RBX: 0000000000000001 RCX: ffff888128a24f00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90007847978 R08: ffff8881f7138e97 R09: 1ffff1103ee271d2
R10: dffffc0000000000 R11: ffffed103ee271d3 R12: ffff8881f7138e80
R13: 1ffff1103ee07af9 R14: 0000000000000000 R15: ffff8881f703d7c8
FS:  0000000000000000(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f24e99b7000 CR3: 000000000660f000 CR4: 00000000003506a0
DR0: 0000200000000300 DR1: 0000200000000300 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1134
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1442 [inline]
 text_poke_bp_batch+0x1d4/0x600 arch/x86/kernel/alternative.c:1642
 text_poke_flush arch/x86/kernel/alternative.c:1833 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1840
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146
 __jump_label_update+0x38f/0x3b0 kernel/jump_label.c:459
 jump_label_update+0x39b/0x450 kernel/jump_label.c:830
 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:783
 process_one_work+0x6c8/0xbb0 kernel/workqueue.c:2328
 worker_thread+0xaa0/0x1250 kernel/workqueue.c:2475
 kthread+0x3f5/0x4f0 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>