rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=cd1/1/0x4000000000000000 softirq=23086/23087 fqs=5195 
	(t=10502 jiffies g=35773 q=3392)
NMI backtrace for cpu 1
CPU: 1 PID: 12763 Comm: syz-executor.5 Not tainted 5.15.0-rc7-next-20211029-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:88 [inline]
 dump_stack_lvl+0xcd/0x134 lib/dump_stack.c:106
 nmi_cpu_backtrace.cold+0x47/0x144 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x1ae/0x220 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x25e/0x3f0 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:604 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:688 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2620
 update_process_times+0x16d/0x200 kernel/time/timer.c:1785
 tick_sched_handle+0x9b/0x180 kernel/time/tick-sched.c:226
 tick_sched_timer+0x1b0/0x2d0 kernel/time/tick-sched.c:1428
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x1c0/0xe50 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x31c/0x790 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0x146/0x530 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8e/0xc0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20 arch/x86/include/asm/idtentry.h:638
RIP: 0010:rcu_lockdep_current_cpu_online kernel/rcu/tree.c:1177 [inline]
RIP: 0010:rcu_lockdep_current_cpu_online+0x7f/0x150 kernel/rcu/tree.c:1167
Code: c1 ea 03 80 3c 02 00 0f 85 ad 00 00 00 48 03 1c ed a0 f8 0d 8b 48 b8 00 00 00 00 00 fc ff df 48 8d 7b 18 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 90 00 00 00 48 8d 7b 20 48 8b 6b 18 48 b8 00 00
RSP: 0018:ffffc90002a9f950 EFLAGS: 00000a02
RAX: dffffc0000000000 RBX: ffff8880b9d3a900 RCX: ffffffff815ce048
RDX: 1ffff110173a7523 RSI: 0000000000000003 RDI: ffff8880b9d3a918
RBP: 0000000000000001 R08: 0000000000000000 R09: ffffffff8d46b617
R10: fffffbfff1a8d6c2 R11: 0000000000000000 R12: 0000000000000001
R13: 0000000000000000 R14: ffff8880156c53d8 R15: 0000000000000000
 rcu_read_lock_held_common kernel/rcu/update.c:112 [inline]
 rcu_read_lock_held_common kernel/rcu/update.c:102 [inline]
 rcu_read_lock_sched_held+0x25/0x70 kernel/rcu/update.c:123
 trace_lock_acquire include/trace/events/lock.h:13 [inline]
 lock_acquire+0x442/0x510 kernel/locking/lockdep.c:5608
 __raw_spin_lock include/linux/spinlock_api_smp.h:142 [inline]
 _raw_spin_lock+0x2a/0x40 kernel/locking/spinlock.c:154
 spin_lock include/linux/spinlock.h:367 [inline]
 __io_free_req+0x2f6/0x3c5 fs/io_uring.c:2039
 tctx_task_work+0x1b3/0x630 fs/io_uring.c:2207
 task_work_run+0xdd/0x1a0 kernel/task_work.c:164
 exit_task_work include/linux/task_work.h:32 [inline]
 do_exit+0xc14/0x2b40 kernel/exit.c:832
 do_group_exit+0x125/0x310 kernel/exit.c:929
 get_signal+0x47d/0x21d0 kernel/signal.c:2820
 arch_do_signal_or_restart+0x2a9/0x1c40 arch/x86/kernel/signal.c:868
 handle_signal_work kernel/entry/common.c:148 [inline]
 exit_to_user_mode_loop kernel/entry/common.c:172 [inline]
 exit_to_user_mode_prepare+0x17d/0x290 kernel/entry/common.c:207
 __syscall_exit_to_user_mode_work kernel/entry/common.c:289 [inline]
 syscall_exit_to_user_mode+0x19/0x60 kernel/entry/common.c:300
 do_syscall_64+0x42/0xb0 arch/x86/entry/common.c:86
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f10b44e2ae9
Code: Unable to access opcode bytes at RIP 0x7f10b44e2abf.
RSP: 002b:00007f10b1a58218 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 00007f10b45f5f68 RCX: 00007f10b44e2ae9
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 00007f10b45f5f6c
RBP: 00007f10b45f5f60 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000246 R12: 00007f10b45f5f6c
R13: 00007ffd4ed3fc2f R14: 00007f10b1a58300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	c1 ea 03             	shr    $0x3,%edx
   3:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1)
   7:	0f 85 ad 00 00 00    	jne    0xba
   d:	48 03 1c ed a0 f8 0d 	add    -0x74f20760(,%rbp,8),%rbx
  14:	8b
  15:	48 b8 00 00 00 00 00 	movabs $0xdffffc0000000000,%rax
  1c:	fc ff df
  1f:	48 8d 7b 18          	lea    0x18(%rbx),%rdi
  23:	48 89 fa             	mov    %rdi,%rdx
  26:	48 c1 ea 03          	shr    $0x3,%rdx
* 2a:	80 3c 02 00          	cmpb   $0x0,(%rdx,%rax,1) <-- trapping instruction
  2e:	0f 85 90 00 00 00    	jne    0xc4
  34:	48 8d 7b 20          	lea    0x20(%rbx),%rdi
  38:	48 8b 6b 18          	mov    0x18(%rbx),%rbp
  3c:	48                   	rex.W
  3d:	b8                   	.byte 0xb8