rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=415/1/0x4000000000000000 softirq=13346/13347 fqs=5062 
	(t=10500 jiffies g=17545 q=4714)
NMI backtrace for cpu 1
CPU: 1 PID: 9236 Comm: syz-executor.2 Not tainted 5.15.0-rc6-next-20211025-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:__sanitizer_cov_trace_pc+0x37/0x60 kernel/kcov.c:200
Code: 81 e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e 85 c9 74 35 8b 82 ac 15 00 00 85 c0 74 2b 8b 82 88 15 00 00 <83> f8 02 75 20 48 8b 8a 90 15 00 00 8b 92 8c 15 00 00 48 8b 01 48
RSP: 0018:ffffc90004d0f818 EFLAGS: 00000246
RAX: 0000000000000002 RBX: ffff88806fa02128 RCX: 0000000000000000
RDX: ffff88807f129d40 RSI: ffffffff81d38eff RDI: 0000000000000003
RBP: ffffc90004d0f910 R08: 0000000000001000 R09: 0000000000000000
R10: ffffffff81d38ef5 R11: 0000000000000000 R12: 1ffff920009a1f07
R13: 0000000000001000 R14: 0000000000001000 R15: ffff88806fa02140
 seq_vprintf fs/seq_file.c:390 [inline]
 seq_printf+0x10f/0x240 fs/seq_file.c:406
 __io_uring_show_fdinfo fs/io_uring.c:10148 [inline]
 io_uring_show_fdinfo+0x47f/0x1372 fs/io_uring.c:10231
 seq_show+0x58d/0x800 fs/proc/fd.c:68
 seq_read_iter+0x4f6/0x1240 fs/seq_file.c:230
 seq_read+0x3e0/0x5b0 fs/seq_file.c:162
 do_loop_readv_writev fs/read_write.c:750 [inline]
 do_loop_readv_writev fs/read_write.c:737 [inline]
 do_iter_read+0x501/0x760 fs/read_write.c:792
 vfs_readv+0xe5/0x150 fs/read_write.c:910
 do_preadv fs/read_write.c:1002 [inline]
 __do_sys_preadv fs/read_write.c:1052 [inline]
 __se_sys_preadv fs/read_write.c:1047 [inline]
 __x64_sys_preadv+0x231/0x310 fs/read_write.c:1047
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x44/0xae
RIP: 0033:0x7f84fa84aa39
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 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 bc ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f84f7d7e188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f84fa94e0e0 RCX: 00007f84fa84aa39
RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000005
RBP: 00007f84fa8a4e8f R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffd3e423af R14: 00007f84f7d7e300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	81 e1 00 01 00 00    	and    $0x100,%ecx
   6:	65 48 8b 14 25 40 70 	mov    %gs:0x27040,%rdx
   d:	02 00
   f:	a9 00 01 ff 00       	test   $0xff0100,%eax
  14:	74 0e                	je     0x24
  16:	85 c9                	test   %ecx,%ecx
  18:	74 35                	je     0x4f
  1a:	8b 82 ac 15 00 00    	mov    0x15ac(%rdx),%eax
  20:	85 c0                	test   %eax,%eax
  22:	74 2b                	je     0x4f
  24:	8b 82 88 15 00 00    	mov    0x1588(%rdx),%eax
* 2a:	83 f8 02             	cmp    $0x2,%eax <-- trapping instruction
  2d:	75 20                	jne    0x4f
  2f:	48 8b 8a 90 15 00 00 	mov    0x1590(%rdx),%rcx
  36:	8b 92 8c 15 00 00    	mov    0x158c(%rdx),%edx
  3c:	48 8b 01             	mov    (%rcx),%rax
  3f:	48                   	rex.W