kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
watchdog: BUG: soft lockup - CPU#0 stuck for 222s! [kworker/u4:6:438]
Modules linked in:
CPU: 0 PID: 438 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+0x8e3/0xa10 kernel/smp.c:969
Code: 84 c0 0f 85 9d 00 00 00 41 8b 1f 89 de 83 e6 01 31 ff e8 30 50 0a 00 83 e3 01 48 8b 5c 24 10 75 07 e8 71 4c 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:ffffc90007757860 EFLAGS: 00000293
RAX: ffffffff815f7d95 RBX: ffff8881f7038e80 RCX: ffff888113d693c0
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc90007757978 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: 00007fd48055bff8 CR3: 000000000660f000 CR4: 00000000003506b0
Call Trace:
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:2325
worker_thread+0xa59/0x1200 kernel/workqueue.c:2472
kthread+0x411/0x500 kernel/kthread.c:337
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:287
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 11117 Comm: syz.9.3011 Tainted: G W syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:check_kcov_mode kernel/kcov.c:183 [inline]
RIP: 0010:write_comp_data kernel/kcov.c:227 [inline]
RIP: 0010:__sanitizer_cov_trace_const_cmp4+0x36/0x90 kernel/kcov.c:293
Code: e0 9f 98 7e 65 8b 15 e1 9f 98 7e 81 e2 00 01 ff 00 74 11 81 fa 00 01 00 00 75 5b 83 b9 5c 0b 00 00 00 74 52 8b 91 38 0b 00 00 <83> fa 03 75 47 48 8b 91 40 0b 00 00 44 8b 89 3c 0b 00 00 49 c1 e1
RSP: 0018:ffffc90000a87a00 EFLAGS: 00000046
RAX: ffffffff82c46c60 RBX: 0000000000000000 RCX: ffff88811147bb40
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90000a87a00 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffff52000150f2c R12: 1ffff11020b7bae4
R13: ffff888105bdd724 R14: ffff888105bdd700 R15: dffffc0000000000
FS: 00007f98923cd6c0(0000) GS:ffff8881f7100000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fd47c15c000 CR3: 0000000155562000 CR4: 00000000003506a0
Call Trace:
__vga_put drivers/gpu/vga/vgaarb.c:391 [inline]
vga_put drivers/gpu/vga/vgaarb.c:562 [inline]
vga_arb_release+0x2c0/0x930 drivers/gpu/vga/vgaarb.c:1350
__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
get_signal+0x13fb/0x1480 kernel/signal.c:2679
arch_do_signal_or_restart+0xdf/0x11c0 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: 0033:0x7f9893972dd9
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:00007f98923cd028 EFLAGS: 00000246 ORIG_RAX: 000000000000010f
RAX: 0000000000000001 RBX: 00007f9893bebfa0 RCX: 00007f9893972dd9
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 00002000000000c0
RBP: 00007f9893a08d69 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f9893bec038 R14: 00007f9893bebfa0 R15: 00007ffc39eb9758