------------[ cut here ]------------
WARNING: CPU: 1 PID: 1001 at kernel/rcu/tree_stall.h:989 rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:989
Modules linked in:
CPU: 1 UID: 0 PID: 1001 Comm: kworker/u8:6 Not tainted 6.15.0-syzkaller-10820-gcd2e103d57e5 #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/07/2025
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:rcu_check_gp_start_stall.part.0+0x1c4/0x4b0 kernel/rcu/tree_stall.h:989
Code: 88 61 01 00 00 be 04 00 00 00 48 c7 c7 c0 5f db 9a e8 90 29 81 00 b8 01 00 00 00 87 05 25 9b 39 19 85 c0 0f 85 3d 01 00 00 90 <0f> 0b 90 48 c7 c3 44 e5 a7 90 48 81 fd c0 fb 5c 8e 74 5a 48 b8 00
RSP: 0018:ffffc90000a08df0 EFLAGS: 00010046
RAX: 0000000000000000 RBX: 0000000000002904 RCX: ffffffff81a1c490
RDX: fffffbfff35b6bf8 RSI: 0000000000000004 RDI: ffffffff9adb5fc0
RBP: ffffffff8e5cfbc0 R08: 0000000000000001 R09: fffffbfff35b6bf8
R10: 0000000000000003 R11: 0000000000000001 R12: 1ffffffff1c42240
R13: 0000000000000246 R14: ffffffff8e5cfbc0 R15: ffff8880b853cc52
FS:  0000000000000000(0000) GS:ffff888124865000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000020000001e000 CR3: 000000000e382000 CR4: 00000000003526f0
DR0: fffffffffffffff8 DR1: 0000000000000006 DR2: 0200000000000000
DR3: 0000000000000005 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 rcu_check_gp_start_stall kernel/rcu/tree_stall.h:952 [inline]
 rcu_core+0x4cf/0x14e0 kernel/rcu/tree.c:2827
 handle_softirqs+0x219/0x8e0 kernel/softirq.c:579
 __do_softirq kernel/softirq.c:613 [inline]
 invoke_softirq kernel/softirq.c:453 [inline]
 __irq_exit_rcu+0x109/0x170 kernel/softirq.c:680
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:696
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1050 [inline]
 sysvec_apic_timer_interrupt+0xa4/0xc0 arch/x86/kernel/apic/apic.c:1050
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:702
RIP: 0010:csd_lock_wait kernel/smp.c:340 [inline]
RIP: 0010:smp_call_function_many_cond+0xd7b/0x1510 kernel/smp.c:885
Code: e8 1a 17 0c 00 45 85 ed 74 46 48 8b 14 24 49 89 d6 49 89 d5 49 c1 ee 03 41 83 e5 07 4d 01 e6 41 83 c5 03 e8 b7 1b 0c 00 f3 90 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 6f 05 00 00 8b 43 08 31 ff
RSP: 0018:ffffc9000364f8a0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: ffff8880b8443b60 RCX: ffffffff81afe5ad
RDX: ffff8880278bc880 RSI: ffffffff81afe589 RDI: 0000000000000005
RBP: 0000000000000001 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000003 R14: ffffed101708876d R15: ffff8880b853cf00
 on_each_cpu_cond_mask+0x40/0x90 kernel/smp.c:1052
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2660 [inline]
 smp_text_poke_batch_finish+0x27b/0xdb0 arch/x86/kernel/alternative.c:2870
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x376/0x550 kernel/jump_label.c:919
 static_key_enable_cpuslocked+0x1b7/0x270 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate mm/kfence/core.c:850 [inline]
 toggle_allocation_gate+0xfa/0x280 mm/kfence/core.c:842
 process_one_work+0x9cf/0x1b70 kernel/workqueue.c:3238
 process_scheduled_works kernel/workqueue.c:3321 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3402
 kthread+0x3c5/0x780 kernel/kthread.c:464
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	e8 1a 17 0c 00       	call   0xc171f
   5:	45 85 ed             	test   %r13d,%r13d
   8:	74 46                	je     0x50
   a:	48 8b 14 24          	mov    (%rsp),%rdx
   e:	49 89 d6             	mov    %rdx,%r14
  11:	49 89 d5             	mov    %rdx,%r13
  14:	49 c1 ee 03          	shr    $0x3,%r14
  18:	41 83 e5 07          	and    $0x7,%r13d
  1c:	4d 01 e6             	add    %r12,%r14
  1f:	41 83 c5 03          	add    $0x3,%r13d
  23:	e8 b7 1b 0c 00       	call   0xc1bdf
  28:	f3 90                	pause
* 2a:	41 0f b6 06          	movzbl (%r14),%eax <-- trapping instruction
  2e:	41 38 c5             	cmp    %al,%r13b
  31:	7c 08                	jl     0x3b
  33:	84 c0                	test   %al,%al
  35:	0f 85 6f 05 00 00    	jne    0x5aa
  3b:	8b 43 08             	mov    0x8(%rbx),%eax
  3e:	31 ff                	xor    %edi,%edi