TITLE: INFO: rcu detected stall in kvm_vcpu_ioctl
TYPE: HANG

[  328.823841] rcu: INFO: rcu_preempt self-detected stall on CPU
[  328.830097] rcu: 	1-...!: (3 GPs behind) idle=19a/1/0x4000000000000002 softirq=12356/12357 fqs=2 
[  328.839607] rcu: 	 (t=10500 jiffies g=12045 q=155)
[  328.844567] rcu: rcu_preempt kthread starved for 10492 jiffies! g12045 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
[  328.855046] rcu: RCU grace-period kthread stack dump:
[  328.860235] rcu_preempt     R  running task    22872    10      2 0x80000000
[  328.867450] Call Trace:
[  328.870074]  __schedule+0x86c/0x1ed0
[  328.919601]  schedule+0xfe/0x460
[  328.950461]  schedule_timeout+0x140/0x260
[  328.969038]  rcu_gp_kthread+0x9d9/0x2310
[  329.236894]  kthread+0x35a/0x420
[  329.248156]  ret_from_fork+0x3a/0x50
[  329.251894] NMI backtrace for cpu 1
[  329.255529] CPU: 1 PID: 8314 Comm: syz-executor2 Not tainted 4.19.0-rc2+ #6
[  329.262634] Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
[  329.271989] Call Trace:
[  329.274578]  <IRQ>
[  329.276738]  dump_stack+0x1c4/0x2b4
[  329.295554]  nmi_cpu_backtrace.cold.3+0x63/0xa2
[  329.305441]  nmi_trigger_cpumask_backtrace+0x1b3/0x1ed
[  329.310726]  arch_trigger_cpumask_backtrace+0x14/0x20
[  329.315961]  rcu_dump_cpu_stacks+0x175/0x1c2
[  329.325408]  print_cpu_stall.cold.78+0x2d3/0x524
[  329.374647]  rcu_check_callbacks+0xfd9/0x1990
[  329.512616]  update_process_times+0x2d/0x70
[  329.516985]  tick_sched_handle+0x9f/0x180
[  329.521146]  tick_sched_timer+0x45/0x130
[  329.525216]  __hrtimer_run_queues+0x41c/0x10d0
[  329.584253]  hrtimer_interrupt+0x313/0x780
[  329.588515]  smp_apic_timer_interrupt+0x1a1/0x760
[  329.655276]  apic_timer_interrupt+0xf/0x20
[  329.659508]  </IRQ>
[  329.661757] RIP: 0010:kvm_mmu_page_fault+0x2a3/0x1ad0
[  329.685879] RSP: 0018:ffff880191beeed0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
[  329.693625] RAX: 0000000000000000 RBX: ffff880191b70480 RCX: ffffc900022ce000
[  329.700898] RDX: 0000000000000007 RSI: ffffffff8112ec74 RDI: 0000000000000005
[  329.708171] RBP: ffff880191bef2b0 R08: ffff8801c44f83c0 R09: ffff880191beed98
[  329.715444] R10: ffff880191beeae8 R11: ffff88018d7cf38b R12: 0000000000000001
[  329.722721] R13: 0000000000000001 R14: 0000000000000001 R15: 0000000000000f7e
[  329.842590]  handle_ept_violation+0x29e/0x6a0
[  329.859146]  vmx_handle_exit+0x2f7/0x17f0
[  329.884567]  vcpu_enter_guest+0x14a9/0x62e0
[  329.992063]  kvm_arch_vcpu_ioctl_run+0x375/0x16e0
[  330.001951]  kvm_vcpu_ioctl+0x72b/0x1150
[  330.061445]  do_vfs_ioctl+0x1de/0x1720
[  330.102388]  ksys_ioctl+0xa9/0xd0
[  330.105859]  __x64_sys_ioctl+0x73/0xb0
[  330.109814]  do_syscall_64+0x1b9/0x820
[  330.148822]  entry_SYSCALL_64_after_hwframe+0x49/0xbe
[  330.154015] RIP: 0033:0x457099
[  330.176154] RSP: 002b:00007f9e42b44c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
[  330.183875] RAX: ffffffffffffffda RBX: 00007f9e42b456d4 RCX: 0000000000457099
[  330.191150] RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
[  330.198426] RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
[  330.205697] R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
[  330.212969] R13: 00000000004cf730 R14: 00000000004c59b9 R15: 0000000000000000