rcu: INFO: rcu_sched self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=802/1/0x4000000000000004 softirq=54070/54071 fqs=0 
rcu: 	 (t=299961 jiffies g=123965 q=198)
rcu: rcu_sched kthread starved for 299961 jiffies! g123965 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_sched       I23480    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x87c/0x1df0 kernel/sched/core.c:3473
 schedule+0xfb/0x450 kernel/sched/core.c:3517
 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
 rcu_gp_kthread+0x743/0x1d20 kernel/rcu/tree.c:2194
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:415
NMI backtrace for cpu 1
CPU: 1 PID: 12400 Comm: syz-executor7 Not tainted 4.19.0-rc2-next-20180904+ #55
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x1c9/0x2b4 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.3+0x48/0x88 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x151/0x192 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x14/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:162 [inline]
 rcu_dump_cpu_stacks+0x175/0x1c2 kernel/rcu/tree.c:1340
 print_cpu_stall.cold.78+0x2fb/0x59c kernel/rcu/tree.c:1478
 check_cpu_stall kernel/rcu/tree.c:1550 [inline]
 __rcu_pending kernel/rcu/tree.c:3276 [inline]
 rcu_pending kernel/rcu/tree.c:3319 [inline]
 rcu_check_callbacks+0xd4a/0x15a0 kernel/rcu/tree.c:2665
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x3eb/0xff0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x2f3/0x750 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x16d/0x6a0 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:867
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:798 [inline]
RIP: 0010:__do_softirq+0x2a3/0xa74 kernel/softirq.c:276
Code: c7 c0 78 be 11 88 48 c1 e8 03 42 80 3c 28 00 0f 85 aa 06 00 00 48 83 3d e2 bb 11 01 00 0f 84 05 06 00 00 fb 66 0f 1f 44 00 00 <48> c7 85 68 fe ff ff 00 91 00 88 b8 ff ff ff ff 0f bc 85 74 fe ff
RSP: 0018:ffff8801db107dc0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff10237cf RBX: ffff8801d2a54240 RCX: 1ffff1003a54a954
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff8801d2a54a7c
RBP: ffff8801db107f98 R08: ffff8801d2a54a80 R09: 0000000000000002
R10: ffff8801d2a54240 R11: 0000000000000000 R12: 0000000000000026
R13: dffffc0000000000 R14: 0000000000000026 R15: 0000000000000000
 invoke_softirq kernel/softirq.c:372 [inline]
 irq_exit+0x1d6/0x210 kernel/softirq.c:412
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 do_IRQ+0xf9/0x1a0 arch/x86/kernel/irq.c:258
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:645
 </IRQ>
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:788 [inline]
RIP: 0010:lock_release+0x4dc/0x9f0 kernel/locking/lockdep.c:3923
Code: 00 00 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 73 03 00 00 48 83 3d 5b 0d b2 06 00 0f 84 a4 02 00 00 48 8b bd e8 fe ff ff 57 9d <0f> 1f 44 00 00 48 b8 00 00 00 00 00 fc ff df 48 01 c3 48 c7 03 00
RSP: 0018:ffff8801915af720 EFLAGS: 00000286 ORIG_RAX: ffffffffffffffd9
RAX: dffffc0000000000 RBX: 1ffff100322b5ee9 RCX: 1ffff1003a54a94e
RDX: 1ffffffff10237cd RSI: 0000000000000002 RDI: 0000000000000286
RBP: ffff8801915af850 R08: 1ffff100322b5eed R09: 0000000000000001
R10: 0000000000000003 R11: 0000000000000001 R12: ffff8801d2a54240
R13: ffffc90006684da8 R14: ffff8801d2a54240 R15: ffff8801915af768
 rcu_lock_release include/linux/rcupdate.h:249 [inline]
 srcu_read_unlock include/linux/srcu.h:223 [inline]
 vcpu_run arch/x86/kvm/x86.c:7722 [inline]
 kvm_arch_vcpu_ioctl_run+0xdca/0x16d0 arch/x86/kvm/x86.c:7870
 kvm_vcpu_ioctl+0x7b8/0x1280 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2590
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:501 [inline]
 do_vfs_ioctl+0x1de/0x1720 fs/ioctl.c:685
 ksys_ioctl+0xa9/0xd0 fs/ioctl.c:702
 __do_sys_ioctl fs/ioctl.c:709 [inline]
 __se_sys_ioctl fs/ioctl.c:707 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:707
 do_syscall_64+0x1b9/0x820 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x457099
Code: fd b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00 00 66 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 cb b4 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fc270f46c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007fc270f476d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 0000000000930280 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cf730 R14: 00000000004c59b9 R15: 0000000000000003