rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=50d/1/0x4000000000000000 softirq=99958/99959 fqs=5108 
	(t=10500 jiffies g=163725 q=1476)
NMI backtrace for cpu 1
CPU: 1 PID: 14107 Comm: vhost-14100 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:iotlb_access_ok+0x1d7/0x330 drivers/vhost/vhost.c:1340
Code: 0f 87 42 01 00 00 49 8d 5c 24 48 48 89 d8 48 c1 e8 03 0f b6 04 28 84 c0 0f 85 f8 00 00 00 44 8b 3b 44 89 fe 8b 5c 24 04 21 de <31> ff e8 12 a8 e3 f9 44 89 f8 21 d8 0f 84 26 01 00 00 4c 89 6c 24
RSP: 0018:ffffc9000b627ab0 EFLAGS: 00000202
RAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000040000
RDX: ffff88801bd73a00 RSI: 0000000000000001 RDI: 0000000000000000
RBP: dffffc0000000000 R08: ffffffff87a0a0a5 R09: fffff520016c4f2d
R10: fffff520016c4f2d R11: 0000000000000000 R12: ffff88804d2f2a00
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000003
 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:	0f 87 42 01 00 00    	ja     0x148
   6:	49 8d 5c 24 48       	lea    0x48(%r12),%rbx
   b:	48 89 d8             	mov    %rbx,%rax
   e:	48 c1 e8 03          	shr    $0x3,%rax
  12:	0f b6 04 28          	movzbl (%rax,%rbp,1),%eax
  16:	84 c0                	test   %al,%al
  18:	0f 85 f8 00 00 00    	jne    0x116
  1e:	44 8b 3b             	mov    (%rbx),%r15d
  21:	44 89 fe             	mov    %r15d,%esi
  24:	8b 5c 24 04          	mov    0x4(%rsp),%ebx
  28:	21 de                	and    %ebx,%esi
* 2a:	31 ff                	xor    %edi,%edi <-- trapping instruction
  2c:	e8 12 a8 e3 f9       	callq  0xf9e3a843
  31:	44 89 f8             	mov    %r15d,%eax
  34:	21 d8                	and    %ebx,%eax
  36:	0f 84 26 01 00 00    	je     0x162
  3c:	4c                   	rex.WR
  3d:	89                   	.byte 0x89
  3e:	6c                   	insb   (%dx),%es:(%rdi)
  3f:	24                   	.byte 0x24