rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (10504 ticks this GP) idle=f5f/1/0x4000000000000000 softirq=60407/60409 fqs=5232 
	(t=10502 jiffies g=115581 q=5562)
NMI backtrace for cpu 0
CPU: 0 PID: 26870 Comm: vhost-26865 Not tainted 5.15.0-rc7-next-20211027-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:iotlb_access_ok+0x2a3/0x3e0 drivers/vhost/vhost.c:1349
Code: 80 3c 10 00 0f 85 df 00 00 00 4c 03 63 38 48 89 ee 48 8b 3c 24 4d 89 e7 e8 ba 12 c9 fa 49 29 ef 48 39 2c 24 0f 85 f0 fe ff ff <e8> 38 0f c9 fa 48 8b 6c 24 08 4c 89 fe 48 89 ef e8 98 12 c9 fa 4c
RSP: 0018:ffffc9000bb6fb28 EFLAGS: 00000246
RAX: 0000000000000000 RBX: ffff88801866d880 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffff88801bf1d7c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffc9000bb6fb1f
R10: ffffffff86ae9db6 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000001 R15: 0000000000000000
 vq_meta_prefetch+0xbc/0x280 drivers/vhost/vhost.c:1366
 handle_rx+0x145/0x1b40 drivers/vhost/net.c:1140
 vhost_worker+0x23d/0x3d0 drivers/vhost/vhost.c:372
 kthread+0x405/0x4f0 kernel/kthread.c:327
 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295
 </TASK>
----------------
Code disassembly (best guess):
   0:	80 3c 10 00          	cmpb   $0x0,(%rax,%rdx,1)
   4:	0f 85 df 00 00 00    	jne    0xe9
   a:	4c 03 63 38          	add    0x38(%rbx),%r12
   e:	48 89 ee             	mov    %rbp,%rsi
  11:	48 8b 3c 24          	mov    (%rsp),%rdi
  15:	4d 89 e7             	mov    %r12,%r15
  18:	e8 ba 12 c9 fa       	callq  0xfac912d7
  1d:	49 29 ef             	sub    %rbp,%r15
  20:	48 39 2c 24          	cmp    %rbp,(%rsp)
  24:	0f 85 f0 fe ff ff    	jne    0xffffff1a
* 2a:	e8 38 0f c9 fa       	callq  0xfac90f67 <-- trapping instruction
  2f:	48 8b 6c 24 08       	mov    0x8(%rsp),%rbp
  34:	4c 89 fe             	mov    %r15,%rsi
  37:	48 89 ef             	mov    %rbp,%rdi
  3a:	e8 98 12 c9 fa       	callq  0xfac912d7
  3f:	4c                   	rex.WR