RBP: 00007f0e87c32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e87e16128 R14: 00007f0e87e16090 R15: 00007ffcc2966268
</TASK>
watchdog: BUG: soft lockup - CPU#0 stuck for 266s! [syz.0.865:3467]
Modules linked in:
CPU: 0 PID: 3467 Comm: syz.0.865 Not tainted syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 04/18/2026
RIP: 0010:variable_ffs arch/x86/include/asm/bitops.h:319 [inline]
RIP: 0010:handle_softirqs+0x144/0x600 kernel/softirq.c:630
Code: 85 e8 c0 46 b8 03 65 66 89 1d 08 00 c0 7e 48 c7 c7 c0 06 69 85 e8 ac 46 b8 03 65 44 89 25 8c fd be 7e fb 49 c7 c5 c0 a0 00 87 <44> 89 65 ac b8 ff ff ff ff 0f bc 45 ac 89 c3 ff c3 0f 84 a2 02 00
RSP: 0018:ffffc90000007f30 EFLAGS: 00000286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 2d4b616e8fd60900
RDX: 1ffffffff0f6e800 RSI: ffffffff856906c0 RDI: ffffffff85ca8d20
RBP: ffffc90000007fc0 R08: ffffffff87b74008 R09: ffffffff87b74018
R10: ffffffff87b74003 R11: 1ffffffff0f6e800 R12: 0000000000000002
R13: ffffffff8700a0c0 R14: 0000000000000002 R15: ffff888157170000
FS: 00007f0e889a86c0(0000) GS:ffff8881f6e00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000100000001 CR3: 0000000118e9a000 CR4: 00000000003506b0
DR0: 0100000000000000 DR1: 00000000000000fd DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
Call Trace:
<IRQ>
__do_softirq kernel/softirq.c:680 [inline]
invoke_softirq kernel/softirq.c:497 [inline]
__irq_exit_rcu+0x52/0xf0 kernel/softirq.c:729
irq_exit_rcu+0x9/0x10 kernel/softirq.c:741
instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1118 [inline]
sysvec_apic_timer_interrupt+0xa9/0xc0 arch/x86/kernel/apic/apic.c:1118
</IRQ>
<TASK>
asm_sysvec_apic_timer_interrupt+0x1b/0x20 arch/x86/include/asm/idtentry.h:691
RIP: 0010:preempt_schedule_irq+0xa5/0x120 kernel/sched/core.c:7067
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 01 a0 4b fc fb bf 01 00 00 00 <e8> f6 e4 ff ff fa bf 01 00 00 00 e8 ab a1 4b fc 65 48 8b 1d 13 69
RSP: 0018:ffffc90005347a60 EFLAGS: 00000246
RAX: 1ffff1102ae2e159 RBX: ffffc90005347b38 RCX: ffffffff87b7c100
RDX: 1ffffffff0f6e800 RSI: 0000000000000000 RDI: 0000000000000001
RBP: ffffc90005347ae8 R08: ffffffff87b74008 R09: ffffffff87b74018
R10: ffffffff87b74003 R11: 1ffffffff0f6e800 R12: 0000000000000000
R13: 0000000000000000 R14: dffffc0000000000 R15: 1ffff92000a68f4c
raw_irqentry_exit_cond_resched+0x29/0x30 kernel/entry/common.c:396
irqentry_exit+0x37/0x40 kernel/entry/common.c:439
sysvec_irq_work+0x61/0xc0 arch/x86/kernel/irq_work.c:17
asm_sysvec_irq_work+0x1b/0x20 arch/x86/include/asm/idtentry.h:728
RIP: 0010:_perf_ioctl kernel/events/core.c:5778 [inline]
RIP: 0010:perf_ioctl+0x147a/0x1e70 kernel/events/core.c:5837
Code: 00 65 48 8b 04 25 28 00 00 00 48 3b 84 24 40 02 00 00 0f 85 3e 09 00 00 4c 89 f8 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 <e8> 31 60 d7 ff 45 31 ff e9 6e ff ff ff e8 24 60 d7 ff 41 bf ea ff
RSP: 0018:ffffc90005347be0 EFLAGS: 00000246
RAX: ffffffff819a0fad RBX: 0000000000000000 RCX: 0000000000000002
RDX: ffff888157170000 RSI: 0000000000000000 RDI: 0000000000000000
RBP: ffffc90005347e80 R08: ffff888133dbc03f R09: 1ffff110267b7807
R10: dffffc0000000000 R11: ffffed10267b7808 R12: 0000000040042408
R13: dffffc0000000000 R14: fffff52000a68f8c R15: ffffc90007b1c000
vfs_ioctl fs/ioctl.c:51 [inline]
__do_sys_ioctl fs/ioctl.c:870 [inline]
__se_sys_ioctl+0x12f/0x1b0 fs/ioctl.c:856
__x64_sys_ioctl+0x7b/0x90 fs/ioctl.c:856
x64_sys_call+0x58b/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:17
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: 0033:0x7f0e87b9ce59
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:00007f0e889a8028 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f0e87e16090 RCX: 00007f0e87b9ce59
RDX: 000000000000000a RSI: 0000000040042408 RDI: 000000000000000b
RBP: 00007f0e87c32d6f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f0e87e16128 R14: 00007f0e87e16090 R15: 00007ffcc2966268
</TASK>
Sending NMI from CPU 0 to CPUs 1:
NMI backtrace for cpu 1
CPU: 1 PID: 43 Comm: kworker/u4:2 Not tainted 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:453 [inline]
RIP: 0010:smp_call_function_many_cond+0x893/0x980 kernel/smp.c:998
Code: e6 01 31 ff e8 6e 75 09 00 83 e3 01 48 bb 00 00 00 00 00 fc ff df 75 0a e8 3a 71 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 ff e8 17 71 09 00
RSP: 0018:ffffc900002cf840 EFLAGS: 00000293
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: ffff8881003d9440
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffffc900002cf978 R08: ffffc900002cf7c7 R09: 1ffff92000059ef8
R10: 0000000000000000 R11: fffff52000059ef9 R12: 1ffff1103ede7218
R13: 1ffff1103edc7ae1 R14: 0000000000000000 R15: ffff8881f6e3d708
FS: 0000000000000000(0000) GS:ffff8881f6f00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f6541145000 CR3: 000000000700f000 CR4: 00000000003506a0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000600
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+0x37c/0x3a0 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+0x71f/0xc40 kernel/workqueue.c:2302
worker_thread+0xa29/0x11e0 kernel/workqueue.c:2449
kthread+0x281/0x320 kernel/kthread.c:386
ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
</TASK>