kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 225s! [kworker/u4:6:3403]
Modules linked in:
CPU: 0 PID: 3403 Comm: kworker/u4:6 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:440 [inline]
RIP: 0010:smp_call_function_many_cond+0x8f3/0xa10 kernel/smp.c:969
Code: 31 ff e8 30 51 0a 00 83 e3 01 48 8b 5c 24 10 75 07 e8 71 4d 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 07 01 00 00 00 74 1e e8 4b 4d 0a 00 eb da 44 89
RSP: 0018:ffffc90000aa7860 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8881f7038e80 RCX: ffff88810e21e2c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90000aa7978 R08: ffff8881f7038e97 R09: 1ffff1103ee071d2
R10: dffffc0000000000 R11: ffffed103ee071d3 R12: 1ffff1103ee071d0
R13: 1ffff1103ee2784d R14: 0000000000000001 R15: ffff8881f713c268
FS:  0000000000000000(0000) GS:ffff8881f7000000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000000660f000 CR4: 00000000003526b0
DR0: 000000000000000c DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
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+0x37c/0x3a0 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+0x6be/0xba0 kernel/workqueue.c:2328
 worker_thread+0xa59/0x1200 kernel/workqueue.c:2475
 kthread+0x411/0x500 kernel/kthread.c:337
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
 </TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 3492 Comm: syz.0.861 Tainted: G        W         syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:__vga_put drivers/gpu/vga/vgaarb.c:407 [inline]
RIP: 0010:vga_put drivers/gpu/vga/vgaarb.c:562 [inline]
RIP: 0010:vga_arb_release+0x3a5/0x930 drivers/gpu/vga/vgaarb.c:1350
Code: 0f b6 04 38 84 c0 4c 8b 75 c8 0f 85 49 01 00 00 41 80 24 24 fd 48 8b 45 b8 42 0f b6 04 38 84 c0 0f 85 d9 00 00 00 41 8b 1c 24 <44> 8b 65 d4 44 89 e7 89 de e8 0d 08 a5 fe 41 39 dc 75 07 e8 83 06
RSP: 0018:ffffc90000c57d20 EFLAGS: 00000046
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffff88813c56cf00
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000c57da8 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff5200018af90 R12: ffff88810598e320
R13: ffff888128f3ec18 R14: ffff888128f3ec24 R15: dffffc0000000000
FS:  00005555570f1500(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 0000000121248000 CR4: 00000000003526a0
DR0: 000000000000000c DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __fput+0x20b/0x8b0 fs/file_table.c:311
 ____fput+0x15/0x20 fs/file_table.c:339
 task_work_run+0x127/0x190 kernel/task_work.c:188
 tracehook_notify_resume include/linux/tracehook.h:189 [inline]
 exit_to_user_mode_loop+0xd0/0xe0 kernel/entry/common.c:181
 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: 0033:0x7f70f31ade59
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:00007ffcaaf9d1f8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 00007f70f3428da0 RCX: 00007f70f31ade59
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f70f3428da0 R08: 0000000000000006 R09: 0000000000000000
R10: 00007f70f3428cb0 R11: 0000000000000246 R12: 0000000000021ab1
R13: 00007f70f3426fac R14: 00000000000217bd R15: 00007ffcaaf9d300
 </TASK>