------------[ cut here ]------------
cpu_t != t
WARNING: arch/x86/kernel/cpu/mce/core.c:1770 at mce_timer_fn+0x289/0x2e0 arch/x86/kernel/cpu/mce/core.c:1770, CPU#0: kworker/u33:2/46
Modules linked in:
CPU: 0 UID: 0 PID: 46 Comm: kworker/u33:2 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Workqueue: events_unbound toggle_allocation_gate
RIP: 0010:mce_timer_fn+0x289/0x2e0 arch/x86/kernel/cpu/mce/core.c:1770
Code: 58 00 4d 01 e4 4d 39 ec 4d 0f 47 e5 31 ff 4c 89 e6 e8 eb e4 58 00 4d 85 e4 0f 84 20 ff ff ff e9 f7 fe ff ff e8 38 ea 58 00 90 <0f> 0b 90 e9 cf fd ff ff 4c 89 f6 48 c7 c7 a0 ee bf 8f e8 f0 17 85
RSP: 0000:ffffc90000007c20 EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff88802b023440 RCX: 0000000000000100
RDX: ffff888021d82580 RSI: ffffffff81b2b878 RDI: ffffffff8e6a9920
RBP: ffff88802b123440 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000001 R12: 0000000000000000
R13: 0000000000000100 R14: 1ffff92000000f8d R15: ffffffff81b2b5f0
FS:  0000000000000000(0000) GS:ffff88809574a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000f5176e04 CR3: 0000000053122000 CR4: 0000000000352ef0
Call Trace:
 <IRQ>
 call_timer_fn+0x198/0x5f0 kernel/time/timer.c:1748
 expire_timers kernel/time/timer.c:1799 [inline]
 __run_timers+0x757/0xb00 kernel/time/timer.c:2374
 __run_timer_base kernel/time/timer.c:2386 [inline]
 __run_timer_base kernel/time/timer.c:2378 [inline]
 run_timer_base+0x114/0x190 kernel/time/timer.c:2395
 run_timer_softirq+0x10/0x50 kernel/time/timer.c:2403
 handle_softirqs+0x1e6/0x9d0 kernel/softirq.c:645
 __do_softirq kernel/softirq.c:679 [inline]
 invoke_softirq kernel/softirq.c:519 [inline]
 __irq_exit_rcu+0x16a/0x210 kernel/softirq.c:758
 irq_exit_rcu+0x9/0x30 kernel/softirq.c:775
 instr_sysvec_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1062 [inline]
 sysvec_apic_timer_interrupt+0xa3/0xc0 arch/x86/kernel/apic/apic.c:1062
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20 arch/x86/include/asm/idtentry.h:674
RIP: 0010:csd_lock_wait kernel/smp.c:363 [inline]
RIP: 0010:smp_call_function_many_cond+0x8f0/0x18c0 kernel/smp.c:1002
Code: 48 b8 00 00 00 00 00 fc ff df 48 8b 4c 24 08 49 89 ce 83 e1 07 49 c1 ee 03 49 89 cd 49 01 c6 41 83 c5 03 e8 22 bb 0c 00 f3 90 <41> 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 ca 0d 00 00 8b 45 08 31 ff
RSP: 0000:ffffc900006df8a0 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: ffff888021d82580 RSI: ffffffff81fee78e RDI: ffff888021d82580
RBP: ffff88802b341a40 R08: 0000000000000005 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffed10043b0763
R13: 0000000000000003 R14: ffffed1005668349 R15: 0000000000000001
 on_each_cpu include/linux/smp.h:71 [inline]
 smp_text_poke_sync_each_cpu arch/x86/kernel/alternative.c:2641 [inline]
 smp_text_poke_batch_finish+0x337/0xc60 arch/x86/kernel/alternative.c:2851
 arch_jump_label_transform_apply+0x1c/0x30 arch/x86/kernel/jump_label.c:146
 jump_label_update+0x37a/0x550 kernel/jump_label.c:909
 static_key_enable_cpuslocked+0x1bc/0x270 kernel/jump_label.c:210
 static_key_enable+0x1a/0x20 kernel/jump_label.c:223
 toggle_allocation_gate mm/kfence/core.c:902 [inline]
 toggle_allocation_gate+0xfe/0x2d0 mm/kfence/core.c:894
 process_one_work+0xac7/0x1b10 kernel/workqueue.c:3396
 process_scheduled_works kernel/workqueue.c:3479 [inline]
 worker_thread+0x5ef/0xe50 kernel/workqueue.c:3560
 kthread+0x373/0x450 kernel/kthread.c:436
 ret_from_fork+0x730/0xd60 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
   7:	fc ff df
   a:	48 8b 4c 24 08       	mov    0x8(%rsp),%rcx
   f:	49 89 ce             	mov    %rcx,%r14
  12:	83 e1 07             	and    $0x7,%ecx
  15:	49 c1 ee 03          	shr    $0x3,%r14
  19:	49 89 cd             	mov    %rcx,%r13
  1c:	49 01 c6             	add    %rax,%r14
  1f:	41 83 c5 03          	add    $0x3,%r13d
  23:	e8 22 bb 0c 00       	call   0xcbb4a
  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 ca 0d 00 00    	jne    0xe05
  3b:	8b 45 08             	mov    0x8(%rbp),%eax
  3e:	31 ff                	xor    %edi,%edi