rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10500 ticks this GP) idle=0b1/1/0x4000000000000000 softirq=176797/176797 fqs=5183 
	(t=10502 jiffies g=334273 q=7242)
NMI backtrace for cpu 0
CPU: 0 PID: 17120 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:seq_printf+0xaf/0x240 fs/seq_file.c:405
Code: f3 65 48 8b 04 25 28 00 00 00 48 89 84 24 90 00 00 00 31 c0 e8 62 0c a4 ff 48 8d 45 10 48 89 44 24 40 48 8d 84 24 98 00 00 00 <48> 89 44 24 48 4c 89 f8 48 c1 e8 03 c7 44 24 38 10 00 00 00 42 80
RSP: 0018:ffffc9000389f820 EFLAGS: 00000246
RAX: ffffc9000389f8b8 RBX: ffff88808089e5c8 RCX: ffffc9000f561000
RDX: 0000000000040000 RSI: ffffffff81d3bfce RDI: ffff88808089e5c8
RBP: ffffc9000389f910 R08: 0000000000000000 R09: 0000000000000000
R10: ffffffff88d82172 R11: 0000000000000000 R12: 1ffff92000713f07
R13: dffffc0000000000 R14: dffffc0000000000 R15: ffff88808089e5e0
 __io_uring_show_fdinfo fs/io_uring.c:10157 [inline]
 io_uring_show_fdinfo+0x47f/0x1372 fs/io_uring.c:10240
 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:746 [inline]
 do_loop_readv_writev fs/read_write.c:733 [inline]
 do_iter_read+0x501/0x760 fs/read_write.c:788
 vfs_readv+0xe5/0x150 fs/read_write.c:906
 do_preadv fs/read_write.c:998 [inline]
 __do_sys_preadv fs/read_write.c:1048 [inline]
 __se_sys_preadv fs/read_write.c:1043 [inline]
 __x64_sys_preadv+0x231/0x310 fs/read_write.c:1043
 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: 0033:0x7f1425e33ae9
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:00007f1423367188 EFLAGS: 00000246 ORIG_RAX: 0000000000000127
RAX: ffffffffffffffda RBX: 00007f1425f470e0 RCX: 00007f1425e33ae9
RDX: 0000000000000001 RSI: 00000000200001c0 RDI: 0000000000000004
RBP: 00007f1425e8df25 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fff661b3cdf R14: 00007f1423367300 R15: 0000000000022000
 </TASK>
----------------
Code disassembly (best guess):
   0:	f3 65 48 8b 04 25 28 	repz mov %gs:0x28,%rax
   7:	00 00 00
   a:	48 89 84 24 90 00 00 	mov    %rax,0x90(%rsp)
  11:	00
  12:	31 c0                	xor    %eax,%eax
  14:	e8 62 0c a4 ff       	callq  0xffa40c7b
  19:	48 8d 45 10          	lea    0x10(%rbp),%rax
  1d:	48 89 44 24 40       	mov    %rax,0x40(%rsp)
  22:	48 8d 84 24 98 00 00 	lea    0x98(%rsp),%rax
  29:	00
* 2a:	48 89 44 24 48       	mov    %rax,0x48(%rsp) <-- trapping instruction
  2f:	4c 89 f8             	mov    %r15,%rax
  32:	48 c1 e8 03          	shr    $0x3,%rax
  36:	c7 44 24 38 10 00 00 	movl   $0x10,0x38(%rsp)
  3d:	00
  3e:	42                   	rex.X
  3f:	80                   	.byte 0x80