rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 GPs behind) idle=f46/1/0x4000000000000002 softirq=141264/141286 fqs=1 
rcu: 	 (t=10822 jiffies g=135945 q=139)
NMI backtrace for cpu 1
CPU: 1 PID: 7704 Comm: kworker/1:3 Not tainted 5.0.0+ #7
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+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 kernel/rcu/tree.c:1348 [inline]
 check_cpu_stall kernel/rcu/tree.c:1422 [inline]
 rcu_pending kernel/rcu/tree.c:3018 [inline]
 rcu_check_callbacks.cold+0x500/0xa4a 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+0x33e/0xde0 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+0x120/0x570 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xab/0x140 kernel/sched/core.c:3712
Code: 00 00 e8 f8 33 48 fa e8 23 b5 6f fa 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 6c 48 83 3d 2e e9 8c 01 00 74 5e fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 cb d5 ff ff 48 c7 c0 f8 82 92 88 48 c1 e8 03 80
RSP: 0018:ffff888099bafb08 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1125060 RBX: dffffc0000000000 RCX: 1ffff11010d7edc1
RDX: 0000000000000000 RSI: ffff888086bf6de8 RDI: ffff888086bf6dbc
RBP: ffff888099bafb28 R08: ffff888086bf6540 R09: ffff888086bf6e08
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1010d7eca8
R13: ffff888086bf6540 R14: ffffffff88928300 R15: 0000000000000000
 retint_kernel+0x1b/0x2d
RIP: 0010:arch_local_irq_restore arch/x86/include/asm/paravirt.h:766 [inline]
RIP: 0010:queue_delayed_work_on+0x11d/0x200 kernel/workqueue.c:1582
Code: 00 fc ff df 48 c1 e8 03 80 3c 10 00 0f 85 d8 00 00 00 48 83 3d d3 bd 47 07 00 0f 84 9a 00 00 00 e8 58 1f 25 00 48 89 df 57 9d <0f> 1f 44 00 00 e8 49 1f 25 00 44 89 f8 48 83 c4 10 5b 41 5c 41 5d
RSP: 0018:ffff888099bafbe0 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff02
RAX: ffff888086bf6540 RBX: 0000000000000293 RCX: 1ffff11010d7edc1
RDX: 0000000000000000 RSI: ffffffff814ac528 RDI: 0000000000000293
RBP: ffff888099bafc18 R08: ffff888086bf6540 R09: ffff888086bf6e08
R10: 0000000000000000 R11: 0000000000000000 R12: 0000000000000200
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000001
 queue_delayed_work include/linux/workqueue.h:527 [inline]
 srcu_reschedule+0xd7/0x130 kernel/rcu/srcutree.c:1249
 process_srcu+0x125/0xec0 kernel/rcu/srcutree.c:1262
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173
 worker_thread+0x98/0xe40 kernel/workqueue.c:2319
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352