watchdog: BUG: soft lockup - CPU#1 stuck for 225s! [kworker/u4:3:311]
Modules linked in:
CPU: 1 PID: 311 Comm: kworker/u4:3 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:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x854/0x940 kernel/smp.c:998
Code: 41 8b 1f 89 de 83 e6 01 31 ff e8 37 72 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 03 6e 09 00 e9 38 ff ff ff f3 90 <41> 0f b6 44 1d 00 84 c0 75 14 41 f7 07 01 00 00 00 0f 84 1a ff ff
RSP: 0018:ffffc9000dcd7840 EFLAGS: 00000293
RAX: ffffffff8167fde0 RBX: dffffc0000000000 RCX: ffff88810fcf3cc0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc9000dcd7978 R08: ffffc9000dcd77c7 R09: 1ffff92001b9aef8
R10: 0000000000000000 R11: fffff52001b9aef9 R12: 1ffff1103ede7248
R13: 1ffff1103edc7af1 R14: 0000000000000000 R15: ffff8881f6e3d788
FS:  0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000200000ceb030 CR3: 000000000700f000 CR4: 00000000003506a0
Call Trace:
 <TASK>
 on_each_cpu_cond_mask+0x43/0x80 kernel/smp.c:1165
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:1574 [inline]
 text_poke_bp_batch+0x1cf/0x600 arch/x86/kernel/alternative.c:1774
 text_poke_flush arch/x86/kernel/alternative.c:1965 [inline]
 text_poke_finish+0x1a/0x30 arch/x86/kernel/alternative.c:1972
 arch_jump_label_transform_apply+0x15/0x30 arch/x86/kernel/jump_label.c:146
 __jump_label_update+0x38f/0x3b0 kernel/jump_label.c:451
 jump_label_update+0x39b/0x450 kernel/jump_label.c:797
 static_key_enable_cpuslocked+0x126/0x240 kernel/jump_label.c:173
 static_key_enable+0x1a/0x30 kernel/jump_label.c:186
 toggle_allocation_gate+0xba/0x440 mm/kfence/core.c:821
 process_one_work+0x717/0xc30 kernel/workqueue.c:2302
 worker_thread+0xa4d/0x11d0 kernel/workqueue.c:2449
 kthread+0x281/0x320 kernel/kthread.c:386
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 5573 Comm: syz.1.1290 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:native_halt arch/x86/include/asm/irqflags.h:57 [inline]
RIP: 0010:halt arch/x86/include/asm/irqflags.h:98 [inline]
RIP: 0010:kvm_wait+0xdf/0x150 arch/x86/kernel/kvm.c:1058
Code: 43 c6 44 37 04 f8 75 24 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 48 0f b6 07 40 38 f0 75 93 66 90 0f 00 2d 42 23 33 04 f4 <eb> 87 fa 48 89 f8 48 c1 e8 03 42 0f b6 04 30 84 c0 75 3f 0f b6 07
RSP: 0018:ffffc9000931f480 EFLAGS: 00000046
RAX: 0000000000000003 RBX: ffff88811df80220 RCX: ffffffff8501a339
RDX: dffffc0000000000 RSI: 0000000000000003 RDI: ffff88811df80220
RBP: ffffc9000931f510 R08: ffff88811df80220 R09: 1ffff11023bf0044
R10: dffffc0000000000 R11: ffffed1023bf0045 R12: 1ffff11023bf0044
R13: ffff8881f6e38e54 R14: dffffc0000000000 R15: 1ffff92001263e90
FS:  00007f274485b6c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000001b2e019ff8 CR3: 0000000119ba0000 CR4: 00000000003506b0
Call Trace:
 <TASK>
 pv_wait arch/x86/include/asm/paravirt.h:603 [inline]
 pv_wait_head_or_lock kernel/locking/qspinlock_paravirt.h:470 [inline]
 __pv_queued_spin_lock_slowpath+0x687/0xc40 kernel/locking/qspinlock.c:511
 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:591 [inline]
 queued_spin_lock_slowpath+0x47/0x50 arch/x86/include/asm/qspinlock.h:51
 queued_spin_lock include/asm-generic/qspinlock.h:114 [inline]
 do_raw_spin_lock include/linux/spinlock.h:187 [inline]
 __raw_spin_lock_irqsave include/linux/spinlock_api_smp.h:111 [inline]
 _raw_spin_lock_irqsave+0x120/0x130 kernel/locking/spinlock.c:162
 __wake_up_common_lock kernel/sched/wait.c:138 [inline]
 __wake_up+0x107/0x1a0 kernel/sched/wait.c:161
 __io_cqring_wake io_uring/io_uring.h:225 [inline]
 io_req_local_work_add io_uring/io_uring.c:1133 [inline]
 __io_req_task_work_add+0x4a9/0x8a0 io_uring/io_uring.c:1144
 io_req_task_work_add io_uring/io_uring.h:87 [inline]
 __io_poll_execute+0xd1/0x210 io_uring/poll.c:397
 io_poll_wake+0x37f/0x490 io_uring/poll.c:474
 __wake_up_common+0x261/0x470 kernel/sched/wait.c:108
 __wake_up_common_lock kernel/sched/wait.c:139 [inline]
 __wake_up+0x121/0x1a0 kernel/sched/wait.c:161
 __io_cqring_wake io_uring/io_uring.h:225 [inline]
 io_cqring_wake io_uring/io_uring.h:232 [inline]
 io_cqring_ev_posted io_uring/io_uring.c:563 [inline]
 __io_cq_unlock_post io_uring/io_uring.c:571 [inline]
 io_cq_unlock_post io_uring/io_uring.c:588 [inline]
 io_req_complete_post+0x732/0xb00 io_uring/io_uring.c:862
 io_req_complete_failed io_uring/io_uring.c:881 [inline]
 io_queue_async+0x23e/0x800 io_uring/io_uring.c:1904
 io_queue_sqe io_uring/io_uring.c:1934 [inline]
 io_submit_sqe io_uring/io_uring.c:2195 [inline]
 io_submit_sqes+0xe16/0x1b80 io_uring/io_uring.c:2308
 __do_sys_io_uring_enter io_uring/io_uring.c:3432 [inline]
 __se_sys_io_uring_enter+0x32c/0x1f50 io_uring/io_uring.c:3364
 __x64_sys_io_uring_enter+0xe5/0x100 io_uring/io_uring.c:3364
 x64_sys_call+0x4b2/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:427
 do_syscall_x64 arch/x86/entry/common.c:46 [inline]
 do_syscall_64+0x4c/0xa0 arch/x86/entry/common.c:76
 entry_SYSCALL_64_after_hwframe+0x68/0xd2
RIP: 0033:0x7f274399e159
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:00007f274485af38 EFLAGS: 00000246 ORIG_RAX: 00000000000001aa
RAX: ffffffffffffffda RBX: 0000200000000340 RCX: 00007f274399e159
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000006
RBP: 00000000000002a9 R08: 0000000000000000 R09: 0000000000000008
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000000000a0
R13: 00000000000000a8 R14: 0000000000000e26 R15: 0000000000000001
 </TASK>