rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=592/1/0x4000000000000004 softirq=13701/13705 fqs=0 
	(t=29993 jiffies g=14325 q=666)
rcu: rcu_preempt kthread starved for 29993 jiffies! g14325 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29056    10      2 0x80004000
Call Trace:
 context_switch kernel/sched/core.c:2818 [inline]
 __schedule+0x7cb/0x1560 kernel/sched/core.c:3445
 schedule+0xa8/0x260 kernel/sched/core.c:3509
 schedule_timeout+0x486/0xc50 kernel/time/timer.c:1807
 rcu_gp_fqs_loop kernel/rcu/tree.c:1589 [inline]
 rcu_gp_kthread+0x9b2/0x18b0 kernel/rcu/tree.c:1746
 kthread+0x354/0x420 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 10243 Comm: syz-executor.0 Not tainted 5.2.0-rc4+ #27
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+0x172/0x1f0 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_stall.h:254
 print_cpu_stall kernel/rcu/tree_stall.h:455 [inline]
 check_cpu_stall kernel/rcu/tree_stall.h:529 [inline]
 rcu_pending kernel/rcu/tree.c:2625 [inline]
 rcu_sched_clock_irq.cold+0x4d1/0xbfd kernel/rcu/tree.c:2161
 update_process_times+0x32/0x80 kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 kernel/time/tick-sched.c:167
 tick_sched_timer+0x47/0x130 kernel/time/tick-sched.c:1298
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x33b/0xdd0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 smp_apic_timer_interrupt+0x111/0x550 arch/x86/kernel/apic/apic.c:1066
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
RIP: 0010:ffs arch/x86/include/asm/bitops.h:413 [inline]
RIP: 0010:__do_softirq+0x227/0x94c kernel/softirq.c:280
Code: c7 c0 00 74 b2 88 48 c1 e8 03 42 80 3c 38 00 0f 85 29 07 00 00 48 83 3d e6 71 72 01 00 0f 84 e6 05 00 00 fb 66 0f 1f 44 00 00 <b8> ff ff ff ff 48 c7 45 c8 00 91 a0 88 0f bc 45 d4 83 c0 01 89 45
RSP: 0018:ffff8880ae909f10 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1164e80 RBX: ffff88805fce0400 RCX: 1ffff1100bf9c194
RDX: 0000000000000000 RSI: ffff88805fce0c80 RDI: ffff88805fce0c7c
RBP: ffff8880ae909f98 R08: ffff88805fce0400 R09: ffff88805fce0ca0
R10: 0000000000000000 R11: 0000000000000000 R12: ffff88805ff4fa68
R13: 0000000000000025 R14: 0000000000000025 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+0x10f/0x1d0 arch/x86/kernel/irq.c:259
 common_interrupt+0xf/0xf arch/x86/entry/entry_64.S:583
 </IRQ>
RIP: 0010:__srcu_read_unlock+0x5/0x60 kernel/rcu/srcutree.c:420
Code: 48 ff 04 ca f0 83 44 24 fc 00 48 83 c4 08 5b 5d c3 e8 ef 95 4b 00 eb b6 89 45 f4 e8 05 96 4b 00 8b 45 f4 eb d0 55 48 89 e5 53 <48> 89 fb 48 83 ec 08 f0 83 44 24 fc 00 48 81 c7 48 04 00 00 48 b8
RSP: 0018:ffff88805ff4fb18 EFLAGS: 00000282 ORIG_RAX: ffffffffffffffda
RAX: 0000000000000000 RBX: dffffc0000000000 RCX: 1ffff1100bf9c18e
RDX: dffffc0000000000 RSI: 0000000000000000 RDI: ffffc900132847f0
RBP: ffff88805ff4fb20 R08: ffff88805fce0400 R09: 0000000000000002
R10: ffff88805ff4fb30 R11: ffff88805fce0400 R12: ffff88805fa38180
R13: 0000000000000000 R14: ffffc90013284db8 R15: ffffc900132847f0
 srcu_read_unlock include/linux/srcu.h:181 [inline]
 vcpu_run arch/x86/kvm/x86.c:8128 [inline]
 kvm_arch_vcpu_ioctl_run+0x602/0x1740 arch/x86/kvm/x86.c:8307
 kvm_vcpu_ioctl+0x4dc/0xf90 arch/x86/kvm/../../../virt/kvm/kvm_main.c:2755
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:509 [inline]
 do_vfs_ioctl+0xd5f/0x1380 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+0xfd/0x680 arch/x86/entry/common.c:301
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x459279
Code: fd 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 cb b7 fb ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fbe680dcc78 EFLAGS: 00000246 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000459279
RDX: 0000000000000000 RSI: 000000000000ae80 RDI: 0000000000000006
RBP: 000000000075bf20 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fbe680dd6d4
R13: 00000000004c2593 R14: 00000000004d5538 R15: 00000000ffffffff