rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=585/1/0x4000000000000000 softirq=304290/304291 fqs=5080 
	(t=10503 jiffies g=494273 q=35447)
NMI backtrace for cpu 1
CPU: 1 PID: 28547 Comm: vhost-28545 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:preempt_count arch/x86/include/asm/preempt.h:27 [inline]
RIP: 0010:check_kcov_mode kernel/kcov.c:163 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x0/0x60 kernel/kcov.c:197
Code: 01 f0 4d 89 03 e9 63 fd ff ff b9 ff ff ff ff ba 08 00 00 00 4d 8b 03 48 0f bd ca 49 8b 45 00 48 63 c9 e9 64 ff ff ff 0f 1f 00 <65> 8b 05 69 aa 8a 7e 89 c1 48 8b 34 24 81 e1 00 01 00 00 65 48 8b
RSP: 0018:ffffc9000a257ae8 EFLAGS: 00000213
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffffffffffff
RDX: 0000000000000000 RSI: ffff88802bc81d00 RDI: 0000000000000003
RBP: dffffc0000000000 R08: 0000000000000000 R09: ffffc9000a257b1f
R10: ffffffff86c765bd R11: 0000000000000000 R12: ffff88807c821000
R13: 000000000000000f R14: ffffffffffffffff R15: 0000000000000000
 vhost_iotlb_itree_first+0x1fb/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:	01 f0                	add    %esi,%eax
   2:	4d 89 03             	mov    %r8,(%r11)
   5:	e9 63 fd ff ff       	jmpq   0xfffffd6d
   a:	b9 ff ff ff ff       	mov    $0xffffffff,%ecx
   f:	ba 08 00 00 00       	mov    $0x8,%edx
  14:	4d 8b 03             	mov    (%r11),%r8
  17:	48 0f bd ca          	bsr    %rdx,%rcx
  1b:	49 8b 45 00          	mov    0x0(%r13),%rax
  1f:	48 63 c9             	movslq %ecx,%rcx
  22:	e9 64 ff ff ff       	jmpq   0xffffff8b
  27:	0f 1f 00             	nopl   (%rax)
* 2a:	65 8b 05 69 aa 8a 7e 	mov    %gs:0x7e8aaa69(%rip),%eax        # 0x7e8aaa9a <-- trapping instruction
  31:	89 c1                	mov    %eax,%ecx
  33:	48 8b 34 24          	mov    (%rsp),%rsi
  37:	81 e1 00 01 00 00    	and    $0x100,%ecx
  3d:	65                   	gs
  3e:	48                   	rex.W
  3f:	8b                   	.byte 0x8b