rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 ticks this GP) idle=dc6/1/0x4000000000000002 softirq=77293/77293 fqs=0 
	(t=10989 jiffies g=136113 q=182)
rcu: rcu_preempt kthread starved for 10989 jiffies! g136113 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I29112    10      2 0x80004000
Call Trace:
 context_switch /kernel/sched/core.c:3254 [inline]
 __schedule+0x755/0x1580 /kernel/sched/core.c:3880
 schedule+0xa8/0x270 /kernel/sched/core.c:3944
 schedule_timeout+0x486/0xc50 /kernel/time/timer.c:1807
 rcu_gp_fqs_loop /kernel/rcu/tree.c:1611 [inline]
 rcu_gp_kthread+0x9b2/0x18c0 /kernel/rcu/tree.c:1768
 kthread+0x361/0x430 /kernel/kthread.c:255
 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 1
CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.2.0-next-20190718 #41
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: rcu_gp process_srcu
Call Trace:
 <IRQ>
 __dump_stack /lib/dump_stack.c:77 [inline]
 dump_stack+0x172/0x1f0 /lib/dump_stack.c:113
 nmi_cpu_backtrace.cold+0x70/0xb2 /lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x23b/0x28b /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:2736 [inline]
 rcu_sched_clock_irq.cold+0x4dd/0xc13 /kernel/rcu/tree.c:2183
 update_process_times+0x32/0x80 /kernel/time/timer.c:1639
 tick_sched_handle+0xa2/0x190 /kernel/time/tick-sched.c:167
 tick_sched_timer+0x53/0x140 /kernel/time/tick-sched.c:1296
 __run_hrtimer /kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x364/0xe40 /kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x314/0x770 /kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt /arch/x86/kernel/apic/apic.c:1068 [inline]
 smp_apic_timer_interrupt+0x160/0x610 /arch/x86/kernel/apic/apic.c:1093
 apic_timer_interrupt+0xf/0x20 /arch/x86/entry/entry_64.S:828
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xab/0x160 /kernel/sched/core.c:4128
Code: 00 00 e8 98 c6 15 fa e8 c3 08 3f fa 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 7d 48 83 3d 6e f3 99 01 00 74 6f fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 fb db ff ff 48 c7 c0 18 f1 d2 88 48 c1 e8 03 80
RSP: 0018:ffff8880a990fb88 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e24 RBX: dffffc0000000000 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000006 RDI: ffff8880a98fad14
RBP: ffff8880a990fba8 R08: ffff8880a98fa480 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed101531f490
R13: ffff8880a98fa480 R14: ffffffff88d2f120 R15: 0000000000000000
 retint_kernel+0x1b/0x2b
RIP: 0010:arch_local_irq_restore /./arch/x86/include/asm/paravirt.h:767 [inline]
RIP: 0010:lock_release+0x4c0/0x960 /kernel/locking/lockdep.c:4435
Code: 00 00 00 00 00 48 c1 e8 03 80 3c 10 00 0f 85 8c 03 00 00 48 83 3d cf 20 7a 07 00 0f 84 7f 01 00 00 48 8b bd 48 ff 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:ffff8880a990fc60 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff02
RAX: 1ffffffff11a5e22 RBX: 1ffff11015321f91 RCX: 1ffff1101531f5a1
RDX: dffffc0000000000 RSI: 1ffff1101531f5a3 RDI: 0000000000000282
RBP: ffff8880a990fd30 R08: 0000000000000001 R09: ffff8880a98fad10
R10: fffffbfff134a3ff R11: ffffffff89a51fff R12: ffff8880a98fa480
R13: ffffffff814b8b06 R14: ffff8880a990fd08 R15: ffff8880a98fa480
 process_one_work+0xa81/0x1740 /kernel/workqueue.c:2276
 worker_thread+0x98/0xe40 /kernel/workqueue.c:2415
 kthread+0x361/0x430 /kernel/kthread.c:255
 ret_from_fork+0x24/0x30 /arch/x86/entry/entry_64.S:352