rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=2b7/1/0x4000000000000000 softirq=24399/24400 fqs=5176 
	(t=10500 jiffies g=39845 q=1727)
NMI backtrace for cpu 0
CPU: 0 PID: 14816 Comm: vhost-14815 Not tainted 5.15.0-rc3-next-20210930-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:3889 [inline]
 rcu_sched_clock_irq.cold+0x9d/0x746 kernel/rcu/tree.c:2608
 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:check_kcov_mode kernel/kcov.c:166 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0xd/0x60 kernel/kcov.c:200
Code: 00 00 e9 d6 d1 60 02 66 0f 1f 44 00 00 48 8b be b0 01 00 00 e8 b4 ff ff ff 31 c0 c3 90 65 8b 05 29 30 8c 7e 89 c1 48 8b 34 24 <81> e1 00 01 00 00 65 48 8b 14 25 40 70 02 00 a9 00 01 ff 00 74 0e
RSP: 0018:ffffc90003097b20 EFLAGS: 00000202
RAX: 0000000000000000 RBX: ffff888018ec0280 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86c35204 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000000000000 R09: ffffc90003097b1f
R10: ffffffff86c351f6 R11: 0000000000000000 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000003 R15: 0000000000000001
 iotlb_access_ok+0x264/0x3e0 drivers/vhost/vhost.c:1347
 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:	00 00                	add    %al,(%rax)
   2:	e9 d6 d1 60 02       	jmpq   0x260d1dd
   7:	66 0f 1f 44 00 00    	nopw   0x0(%rax,%rax,1)
   d:	48 8b be b0 01 00 00 	mov    0x1b0(%rsi),%rdi
  14:	e8 b4 ff ff ff       	callq  0xffffffcd
  19:	31 c0                	xor    %eax,%eax
  1b:	c3                   	retq
  1c:	90                   	nop
  1d:	65 8b 05 29 30 8c 7e 	mov    %gs:0x7e8c3029(%rip),%eax        # 0x7e8c304d
  24:	89 c1                	mov    %eax,%ecx
  26:	48 8b 34 24          	mov    (%rsp),%rsi
* 2a:	81 e1 00 01 00 00    	and    $0x100,%ecx <-- trapping instruction
  30:	65 48 8b 14 25 40 70 	mov    %gs:0x27040,%rdx
  37:	02 00
  39:	a9 00 01 ff 00       	test   $0xff0100,%eax
  3e:	74 0e                	je     0x4e