syzbot

 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>
watchdog: BUG: soft lockup - CPU#1 stuck for 226s! [kworker/u4:10:2829]
Modules linked in:
irq event stamp: 390064
hardirqs last  enabled at (390063): [<ffffffff8a7fa3fb>] irqentry_exit+0x3b/0x80 kernel/entry/common.c:435
hardirqs last disabled at (390064): [<ffffffff8a7f90ae>] sysvec_apic_timer_interrupt+0xe/0xb0 arch/x86/kernel/apic/apic.c:1076
softirqs last  enabled at (390062): [<ffffffff8a8351a7>] softirq_handle_end kernel/softirq.c:399 [inline]
softirqs last  enabled at (390062): [<ffffffff8a8351a7>] __do_softirq+0x597/0x8de kernel/softirq.c:582
softirqs last disabled at (390051): [<ffffffff814f93e7>] invoke_softirq kernel/softirq.c:427 [inline]
softirqs last disabled at (390051): [<ffffffff814f93e7>] __irq_exit_rcu kernel/softirq.c:632 [inline]
softirqs last disabled at (390051): [<ffffffff814f93e7>] irq_exit_rcu+0xb7/0x120 kernel/softirq.c:644
CPU: 1 PID: 2829 Comm: kworker/u4:10 Not tainted 6.7.0-rc2-syzkaller-00206-gb46ae77f6787 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:csd_lock_wait kernel/smp.c:311 [inline]
RIP: 0010:smp_call_function_many_cond+0x4e9/0x1550 kernel/smp.c:855
Code: 4d 48 b8 00 00 00 00 00 fc ff df 4d 89 f4 4c 89 f5 49 c1 ec 03 83 e5 07 49 01 c4 83 c5 03 e8 7e b8 0b 00 f3 90 41 0f b6 04 24 <40> 38 c5 7c 08 84 c0 0f 85 24 0e 00 00 8b 43 08 31 ff 83 e0 01 41
RSP: 0018:ffffc9000a41f930 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b98442c0 RCX: ffffffff817bd1d8
RDX: ffff888026661dc0 RSI: ffffffff817bd1b2 RDI: 0000000000000005
RBP: 0000000000000003 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000006 R12: ffffed1017308859
R13: 0000000000000001 R14: ffff8880b98442c8 R15: ffff8880b993d8c0
FS:  0000000000000000(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000056181ab31680 CR3: 000000000cd77000 CR4: 0000000000350ef0
Call Trace:
 <IRQ>
 </IRQ>
 <TASK>
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1023
 on_each_cpu include/linux/smp.h:71 [inline]
 text_poke_sync arch/x86/kernel/alternative.c:2006 [inline]
 text_poke_bp_batch+0x22b/0x750 arch/x86/kernel/alternative.c:2216
 text_poke_flush arch/x86/kernel/alternative.c:2407 [inline]
 text_poke_flush arch/x86/kernel/alternative.c:2404 [inline]
 text_poke_finish+0x30/0x40 arch/x86/kernel/alternative.c:2414
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x1d7/0x400 kernel/jump_label.c:829
 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:205
 static_key_enable+0x1a/0x20 kernel/jump_label.c:218
 toggle_allocation_gate mm/kfence/core.c:830 [inline]
 toggle_allocation_gate+0xf4/0x250 mm/kfence/core.c:822
 process_one_work+0x886/0x15d0 kernel/workqueue.c:2630
 process_scheduled_works kernel/workqueue.c:2703 [inline]
 worker_thread+0x8b9/0x1290 kernel/workqueue.c:2784
 kthread+0x2c6/0x3a0 kernel/kthread.c:388
 ret_from_fork+0x45/0x80 arch/x86/kernel/process.c:147
 ret_from_fork_asm+0x11/0x20 arch/x86/entry/entry_64.S:242
 </TASK>