rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 	0-...!: (10502 ticks this GP) idle=f7a/1/0x4000000000000002 softirq=20347/20347 fqs=0 
rcu: 	(detected by 1, t=10503 jiffies, g=1541, q=2)
Sending NMI from CPU 1 to CPUs 0:
INFO: NMI handler (nmi_cpu_backtrace_handler) took too long to run: 1.760 msecs
NMI backtrace for cpu 0
CPU: 0 PID: 12401 Comm: syz-executor3 Not tainted 4.19.0-rc2+ #227
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:arch_local_save_flags arch/x86/include/asm/paravirt.h:783 [inline]
RIP: 0010:__lock_acquire+0xaf4/0x4ec0 kernel/locking/lockdep.c:3288
Code: 00 0f 86 07 f7 ff ff 89 05 e9 6b 48 09 e9 fc f6 ff ff 48 c7 c7 a0 29 52 89 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 98 30 00 00 48 83 3d 7a 9d f1 07 00 0f 84 cd 0a
RSP: 0018:ffff8801dae077b0 EFLAGS: 00000802
RAX: dffffc0000000000 RBX: 1ffff1003b5c0f73 RCX: 0000000000000002
RDX: 1ffffffff12a4534 RSI: 0000000000000000 RDI: ffffffff895229a0
RBP: ffff8801dae07b40 R08: 0000000000000001 R09: 0000000000000001
R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000001
R13: ffffffff8b3bde08 R14: ffff88019c5d64c0 R15: 0000000000000002
FS:  00007f1f7c521700(0000) GS:ffff8801dae00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000000 CR3: 00000001c4f93000 CR4: 00000000001426f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <IRQ>
 lock_acquire+0x1ed/0x520 kernel/locking/lockdep.c:3901
 seqcount_lockdep_reader_access include/linux/seqlock.h:81 [inline]
 read_seqcount_begin include/linux/seqlock.h:164 [inline]
 ktime_get+0x14e/0x440 kernel/time/timekeeping.c:754
 clockevents_program_event+0x158/0x370 kernel/time/clockevents.c:336
 tick_program_event+0xb7/0x130 kernel/time/tick-oneshot.c:48
 hrtimer_interrupt+0x368/0x780 kernel/time/hrtimer.c:1531
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
 </IRQ>
RIP: 0010:arch_local_irq_enable arch/x86/include/asm/paravirt.h:798 [inline]
RIP: 0010:vcpu_enter_guest+0x12ad/0x62e0 arch/x86/kvm/x86.c:7610
Code: 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 b7 4a 00 00 48 83 3d bd 8c 43 08 00 0f 84 b1 3d 00 00 e8 3a 32 70 00 fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 09 cf 46 00 31 ff 65 44 8b 25 af 50 f3 7e 44 89
RSP: 0018:ffff8801b92f74f0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000040000 RBX: ffff880198e08180 RCX: ffffc9000326a000
RDX: 0000000000040000 RSI: ffffffff810e9d06 RDI: ffffffff895229b8
RBP: ffff8801b92f7840 R08: ffff88019c5d6d60 R09: 0000000000000006
R10: 0000000000000000 R11: ffff88019c5d64c0 R12: ffff88019c5d64c0
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 vcpu_run arch/x86/kvm/x86.c:7693 [inline]
 kvm_arch_vcpu_ioctl_run+0x375/0x16e0 arch/x86/kvm/x86.c:7870
 kvm_vcpu_ioctl+0x72b/0x1150 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:00007f1f7c520c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1f7c5216d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000007
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cf730 R14: 00000000004c59b9 R15: 0000000000000000
rcu: rcu_sched kthread starved for 10504 jiffies! g1541 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: RCU grace-period kthread stack dump:
rcu: 	0-...!: (10500 ticks this GP) idle=f7a/1/0x4000000000000002 softirq=20347/20347 fqs=0 
rcu_sched       I
rcu: 	
24680    11      2 0x80000000
 (t=10500 jiffies g=26761 q=547)
Call Trace:
rcu: rcu_preempt kthread starved for 10500 jiffies! g26761 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I
22560    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2825 [inline]
 __schedule+0x86c/0x1ed0 kernel/sched/core.c:3473
 schedule+0xfe/0x460 kernel/sched/core.c:3517
 schedule+0xfe/0x460 kernel/sched/core.c:3517
 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
 rcu_gp_kthread+0x9d9/0x2310 kernel/rcu/tree.c:2194
 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804
 rcu_gp_kthread+0x9d9/0x2310 kernel/rcu/tree.c:2194
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
sched: RT throttling activated
 kthread+0x35a/0x420 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:413
NMI backtrace for cpu 0
CPU: 0 PID: 12401 Comm: syz-executor3 Not tainted 4.19.0-rc2+ #227
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+0x1c4/0x2b4 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.3+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1b3/0x1ed 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+0x2d3/0x524 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+0xfd9/0x1990 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+0x41c/0x10d0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1029 [inline]
 smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1054
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:864
 </IRQ>
RIP: 0010:kvm_apic_accept_events+0x1d7/0x600 arch/x86/kvm/lapic.c:2624
Code: 0f 85 e5 03 00 00 49 8b 9e d8 00 00 00 4d 8d 6f c0 31 ff 48 d1 eb 83 e3 01 48 89 de e8 f2 3c 65 00 48 85 db 0f 85 7a 01 00 00 <48> bb 00 00 00 00 00 fc ff df 49 c1 ed 03 e8 a6 3b 65 00 41 c6 44
RSP: 0018:ffff8801b92f7450 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff880198e08560 RBX: ffff880198e08180 RCX: 1ffff100331c10ac
RDX: dffffc0000000000 RSI: ffffffff811994c8 RDI: ffff880198e08180
RBP: ffff8801b92f74e0 R08: ffff88019c5d64c0 R09: fffff520023f1400
R10: ffff8801b92f7860 R11: ffffc90011f8a003 R12: 1ffff1003725ee8b
R13: ffff8801b92f7478 R14: 0000000000000000 R15: ffff8801b92f74b8
 vcpu_enter_guest+0x14f2/0x62e0 arch/x86/kvm/x86.c:7456
 vcpu_run arch/x86/kvm/x86.c:7693 [inline]
 kvm_arch_vcpu_ioctl_run+0x375/0x16e0 arch/x86/kvm/x86.c:7870
 kvm_vcpu_ioctl+0x72b/0x1150 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:00007f1f7c520c78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 00007f1f7c5216d4 RCX: 0000000000457099
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000007
RBP: 00000000009300a0 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00000000ffffffff
R13: 00000000004cf730 R14: 00000000004c59b9 R15: 0000000000000000