rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=9a1/1/0x4000000000000000 softirq=56315/56316 fqs=5212 
	(t=10502 jiffies g=96053 q=3336)
NMI backtrace for cpu 1
CPU: 1 PID: 28784 Comm: vhost-28780 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+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:627 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:711 [inline]
 rcu_pending kernel/rcu/tree.c:3878 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2597
 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:1421
 __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_cmp8+0xc/0x70 kernel/kcov.c:263
Code: e8 48 c7 44 38 e0 07 00 00 00 48 89 4c 38 f0 4e 89 54 c8 20 48 89 10 c3 66 0f 1f 44 00 00 49 89 f8 bf 03 00 00 00 4c 8b 14 24 <48> 89 f1 65 48 8b 34 25 40 70 02 00 e8 c3 f1 ff ff 84 c0 74 48 48
RSP: 0018:ffffc9000420fae8 EFLAGS: 00000246
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: ffffc90017009000
RDX: 1ffff11003d031aa RSI: ffffffffffffffff RDI: 0000000000000003
RBP: ffff88807296a900 R08: 0000000000000000 R09: ffff888026b701fb
R10: ffffffff86c7cee5 R11: 0000000000000000 R12: ffff88801e818d00
R13: 000000000000000f R14: ffffffffffffffff R15: 0000000000000000
 vhost_iotlb_itree_iter_first drivers/vhost/iotlb.c:19 [inline]
 vhost_iotlb_itree_first+0x75/0x280 drivers/vhost/iotlb.c:169
 iotlb_access_ok+0x1ce/0x3e0 drivers/vhost/vhost.c:1336
 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:	e8 48 c7 44 38       	callq  0x3844c74d
   5:	e0 07                	loopne 0xe
   7:	00 00                	add    %al,(%rax)
   9:	00 48 89             	add    %cl,-0x77(%rax)
   c:	4c 38 f0             	rex.WR cmp %r14b,%al
   f:	4e 89 54 c8 20       	mov    %r10,0x20(%rax,%r9,8)
  14:	48 89 10             	mov    %rdx,(%rax)
  17:	c3                   	retq
  18:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
  1e:	49 89 f8             	mov    %rdi,%r8
  21:	bf 03 00 00 00       	mov    $0x3,%edi
  26:	4c 8b 14 24          	mov    (%rsp),%r10
* 2a:	48 89 f1             	mov    %rsi,%rcx <-- trapping instruction
  2d:	65 48 8b 34 25 40 70 	mov    %gs:0x27040,%rsi
  34:	02 00
  36:	e8 c3 f1 ff ff       	callq  0xfffff1fe
  3b:	84 c0                	test   %al,%al
  3d:	74 48                	je     0x87
  3f:	48                   	rex.W