rcu: INFO: rcu_preempt detected stalls on CPUs/tasks:
	(detected by 0, t=10502 jiffies, g=12909, q=192)
rcu: All QSes seen, last rcu_preempt kthread activity 10502 (4294969656-4294959154), jiffies_till_next_fqs=1, root ->qsmask 0x0
rcu: rcu_preempt kthread starved for 10502 jiffies! g12909 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: 	Unless rcu_preempt kthread gets sufficient CPU time, OOM is now expected behavior.
rcu: RCU grace-period kthread stack dump:
task:rcu_preempt     state:R  running task     stack:28688 pid:   14 ppid:     2 flags:0x00004000
Call Trace:
 <TASK>
 context_switch kernel/sched/core.c:4984 [inline]
 __schedule+0xa9a/0x4940 kernel/sched/core.c:6265
 schedule+0xd2/0x260 kernel/sched/core.c:6338
 schedule_timeout+0x14a/0x2a0 kernel/time/timer.c:1881
 rcu_gp_fqs_loop+0x186/0x810 kernel/rcu/tree.c:1966
 rcu_gp_kthread+0x1de/0x320 kernel/rcu/tree.c:2139
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
rcu: Stack dump where RCU GP kthread last ran:
NMI backtrace for cpu 0
CPU: 0 PID: 8627 Comm: iou-wrk-8626 Not tainted 5.15.0-rc7-next-20211026-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_check_gp_kthread_starvation.cold+0x1fb/0x200 kernel/rcu/tree_stall.h:458
 print_other_cpu_stall kernel/rcu/tree_stall.h:563 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:706 [inline]
 rcu_pending kernel/rcu/tree.c:3922 [inline]
 rcu_sched_clock_irq+0x2125/0x2200 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+0x5c/0x60 kernel/kcov.c:210
Code: 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 83 c0 01 48 39 c2 76 07 48 89 34 c1 48 89 01 <c3> 0f 1f 00 41 55 41 54 49 89 fc 55 48 bd eb 83 b5 80 46 86 c8 61
RSP: 0018:ffffc90016fc7590 EFLAGS: 00000293
RAX: 0000000000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: ffff88803999ba80 RSI: ffffffff890d8348 RDI: 0000000000000003
RBP: ffff888080d00000 R08: 0000000000004000 R09: 0000000000000000
R10: ffffffff81d3a025 R11: 0000000000000000 R12: 0000000014742d15
R13: dffffc0000000000 R14: ffff888039cb0000 R15: ffff88801d874de0
 __io_uring_show_fdinfo fs/io_uring.c:10142 [inline]
 io_uring_show_fdinfo+0x485/0x1372 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
 loop_rw_iter+0x12d/0x530 fs/io_uring.c:3282
 io_iter_do_read fs/io_uring.c:3465 [inline]
 io_iter_do_read fs/io_uring.c:3460 [inline]
 io_read+0xce6/0xff0 fs/io_uring.c:3520
 io_issue_sqe+0x800/0x7010 fs/io_uring.c:6628
 io_wq_submit_work+0x1db/0x580 fs/io_uring.c:6793
 io_worker_handle_work+0x97a/0x16f0 fs/io-wq.c:517
 io_wqe_worker+0x55e/0xc20 fs/io-wq.c:570
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess), 1 bytes skipped:
   0:	88 15 00 00 83 f8    	mov    %dl,-0x77d0000(%rip)        # 0xf8830006
   6:	02 75 20             	add    0x20(%rbp),%dh
   9:	48 8b 8a 90 15 00 00 	mov    0x1590(%rdx),%rcx
  10:	8b 92 8c 15 00 00    	mov    0x158c(%rdx),%edx
  16:	48 8b 01             	mov    (%rcx),%rax
  19:	48 83 c0 01          	add    $0x1,%rax
  1d:	48 39 c2             	cmp    %rax,%rdx
  20:	76 07                	jbe    0x29
  22:	48 89 34 c1          	mov    %rsi,(%rcx,%rax,8)
  26:	48 89 01             	mov    %rax,(%rcx)
* 29:	c3                   	retq <-- trapping instruction
  2a:	0f 1f 00             	nopl   (%rax)
  2d:	41 55                	push   %r13
  2f:	41 54                	push   %r12
  31:	49 89 fc             	mov    %rdi,%r12
  34:	55                   	push   %rbp
  35:	48 bd eb 83 b5 80 46 	movabs $0x61c8864680b583eb,%rbp
  3c:	86 c8 61