rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=52a/1/0x4000000000000004 softirq=14470/14471 fqs=0 
rcu: 	 (t=29984 jiffies g=13937 q=274)
rcu: rcu_preempt kthread starved for 29984 jiffies! g13937 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     R  running task    25848    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x897/0x1e60 kernel/sched/core.c:3472
 schedule+0xfe/0x350 kernel/sched/core.c:3516
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1803
 rcu_gp_fqs_loop+0x6ba/0x970 kernel/rcu/tree.c:1948
 rcu_gp_kthread+0x2bb/0xc10 kernel/rcu/tree.c:2105
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 9895 Comm: syz-executor5 Not tainted 5.0.0-rc3+ #39
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+0x1db/0x2d0 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x63/0xa4 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1be/0x236 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:164 [inline]
 rcu_dump_cpu_stacks+0x183/0x1cf kernel/rcu/tree.c:1211
 print_cpu_stall.cold+0x227/0x40c kernel/rcu/tree.c:1348
 check_cpu_stall kernel/rcu/tree.c:1422 [inline]
 rcu_pending kernel/rcu/tree.c:3018 [inline]
 rcu_check_callbacks+0xb32/0x1380 kernel/rcu/tree.c:2521
 update_process_times+0x32/0x80 kernel/time/timer.c:1635
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:161
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1271
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x3a7/0x1050 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1035 [inline]
 smp_apic_timer_interrupt+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
RIP: 0010:trace_softirq_entry include/trace/events/irq.h:128 [inline]
RIP: 0010:__do_softirq+0x2b0/0xb11 kernel/softirq.c:291
Code: c7 c0 80 81 92 89 48 c1 e8 03 42 80 3c 38 00 0f 85 20 08 00 00 48 83 3d dd 7e 72 01 00 0f 84 08 07 00 00 fb 66 0f 1f 44 00 00 <48> 8d 55 98 b8 ff ff ff ff 48 c7 85 e8 fe ff ff 00 91 80 89 48 c1
RSP: 0018:ffff8880ae707e20 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1325030 RBX: ffff888098dd8100 RCX: 1ffff110131bb134
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888098dd897c
RBP: ffff8880ae707f98 R08: 0000000000000002 R09: ffff888098dd89a0
R10: ffff888098dd8100 R11: 0000000000000000 R12: ffff88804f177918
R13: 0000000000000028 R14: 0000000000000028 R15: dffffc0000000000
 invoke_softirq kernel/softirq.c:373 [inline]
 irq_exit+0x180/0x1d0 kernel/softirq.c:413
 exiting_irq arch/x86/include/asm/apic.h:536 [inline]
 do_IRQ+0x114/0x1d0 arch/x86/kernel/irq.c:258
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:583
 </IRQ>
RIP: 0010:___might_sleep+0x150/0x310 kernel/sched/core.c:6150
Code: 00 00 00 fc ff df 48 c7 04 03 00 00 00 00 48 8b 45 d0 65 48 33 04 25 28 00 00 00 0f 85 93 01 00 00 48 83 c4 68 5b 41 5c 41 5d <41> 5e 41 5f 5d c3 48 c7 c0 a0 ca 56 8b 48 ba 00 00 00 00 00 fc ff
RSP: 0018:ffff88804f1779c0 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffd7
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 1ffff110131bb08e
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffff888098dd8124
RBP: ffff88804f1779d0 R08: ffff888098dd8100 R09: 0000000000000002
R10: 0000000000000000 R11: 0000000000000001 R12: ffff8880508dc000
R13: 0000000000000001 R14: 0000000000001f41 R15: ffff888098dd8100
 vcpu_run arch/x86/kvm/x86.c:8001 [inline]
 kvm_arch_vcpu_ioctl_run+0x5fc/0x16e0 arch/x86/kvm/x86.c:8171
 kvm_vcpu_ioctl+0x558/0x12d0 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2678
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0x107b/0x17d0 fs/ioctl.c:696
 ksys_ioctl+0xab/0xd0 fs/ioctl.c:713
 __do_sys_ioctl fs/ioctl.c:720 [inline]
 __se_sys_ioctl fs/ioctl.c:718 [inline]
 __x64_sys_ioctl+0x73/0xb0 fs/ioctl.c:718
 do_syscall_64+0x1a3/0x800 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x458099
Code: 6d b7 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 3b b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007f4a1bcfdc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000458099
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000005
RBP: 000000000073bfa0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007f4a1bcfe6d4
R13: 00000000004c1016 R14: 00000000004d2c38 R15: 00000000ffffffff