rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=b31/1/0x4000000000000000 softirq=23433/23434 fqs=5226 
	(t=10502 jiffies g=31869 q=2986)
NMI backtrace for cpu 1
CPU: 1 PID: 13275 Comm: vhost-13272 Not tainted 5.15.0-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+0x1dc/0x2d8 lib/dump_stack.c:106
 nmi_cpu_backtrace+0x45f/0x490 lib/nmi_backtrace.c:105
 nmi_trigger_cpumask_backtrace+0x16a/0x280 lib/nmi_backtrace.c:62
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x22d/0x390 kernel/rcu/tree_stall.h:343
 print_cpu_stall kernel/rcu/tree_stall.h:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq+0x1e33/0x2bc0 kernel/rcu/tree.c:2597
 update_process_times+0x197/0x200 kernel/time/timer.c:1785
 tick_sched_handle kernel/time/tick-sched.c:226 [inline]
 tick_sched_timer+0x27d/0x420 kernel/time/tick-sched.c:1421
 __run_hrtimer kernel/time/hrtimer.c:1685 [inline]
 __hrtimer_run_queues+0x4cb/0xa60 kernel/time/hrtimer.c:1749
 hrtimer_interrupt+0x3b3/0x1040 kernel/time/hrtimer.c:1811
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1086 [inline]
 __sysvec_apic_timer_interrupt+0xf9/0x270 arch/x86/kernel/apic/apic.c:1103
 sysvec_apic_timer_interrupt+0x8c/0xb0 arch/x86/kernel/apic/apic.c:1097
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x12/0x20
RIP: 0010:vhost_iotlb_itree_iter_first drivers/vhost/iotlb.c:19 [inline]
RIP: 0010:vhost_iotlb_itree_first+0x8e/0x260 drivers/vhost/iotlb.c:169
Code: 2e fa 49 8b 5d 00 48 89 df 4c 89 fe e8 3b e4 e2 f9 4c 39 fb 73 14 e8 f1 e1 e2 f9 e9 c2 01 00 00 e8 e7 e1 e2 f9 e9 b8 01 00 00 <49> 83 c4 08 4c 89 e0 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80
RSP: 0018:ffffc90005417a78 EFLAGS: 00000286
RAX: 0000000000000002 RBX: ffffffffffffffff RCX: dffffc0000000000
RDX: ffff88802344d700 RSI: 0000000000000000 RDI: ffffffffffffffff
RBP: 000000000000000f R08: ffffffff87a162e5 R09: fffff52000a82f2d
R10: fffff52000a82f2d R11: 0000000000000000 R12: ffff888077994480
R13: ffff8880161e7650 R14: ffff8880161e7600 R15: 0000000000000000
 iotlb_access_ok+0x172/0x330 drivers/vhost/vhost.c:1336
 vq_meta_prefetch+0x9f/0x1d0 drivers/vhost/vhost.c:1366
 handle_rx+0x236/0x1430 drivers/vhost/net.c:1140
 vhost_worker+0x215/0x340 drivers/vhost/vhost.c:372
 kthread+0x468/0x490 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30
 </TASK>
----------------
Code disassembly (best guess):
   0:	2e fa                	cs cli
   2:	49 8b 5d 00          	mov    0x0(%r13),%rbx
   6:	48 89 df             	mov    %rbx,%rdi
   9:	4c 89 fe             	mov    %r15,%rsi
   c:	e8 3b e4 e2 f9       	callq  0xf9e2e44c
  11:	4c 39 fb             	cmp    %r15,%rbx
  14:	73 14                	jae    0x2a
  16:	e8 f1 e1 e2 f9       	callq  0xf9e2e20c
  1b:	e9 c2 01 00 00       	jmpq   0x1e2
  20:	e8 e7 e1 e2 f9       	callq  0xf9e2e20c
  25:	e9 b8 01 00 00       	jmpq   0x1e2
* 2a:	49 83 c4 08          	add    $0x8,%r12 <-- trapping instruction
  2e:	4c 89 e0             	mov    %r12,%rax
  31:	48 c1 e8 03          	shr    $0x3,%rax
  35:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  3c:	fc ff df
  3f:	80                   	.byte 0x80