rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=6e2/1/0x4000000000000002 softirq=283677/283681 fqs=0 
rcu: 	 (t=10994 jiffies g=373161 q=145)
NMI backtrace for cpu 0
CPU: 0 PID: 2919 Comm: kworker/0:2 Not tainted 5.0.0+ #17
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:1223
 print_cpu_stall kernel/rcu/tree.c:1360 [inline]
 check_cpu_stall kernel/rcu/tree.c:1434 [inline]
 rcu_pending kernel/rcu/tree.c:3103 [inline]
 rcu_sched_clock_irq.cold+0x500/0xa4a kernel/rcu/tree.c:2544
 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:3745
Code: 00 00 e8 a8 07 43 fa e8 b3 00 6b fa 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 6c 48 83 3d 4e cc 87 01 00 74 5e fb 66 0f 1f 44 00 00 <bf> 01 00 00 00 e8 cb d5 ff ff 48 c7 c0 38 94 92 88 48 c1 e8 03 80
RSP: 0018:ffff88809f01fab8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff1125288 RBX: dffffc0000000000 RCX: 1ffff11013ec49be
RDX: 0000000000000000 RSI: ffff88809f624dd0 RDI: ffff88809f624d7c
RBP: ffff88809f01fad8 R08: ffff88809f624500 R09: ffff88809f624df0
R10: 0000000000000000 R11: 0000000000000000 R12: ffffed1013ec48a0
R13: ffff88809f624500 R14: ffffffff88929440 R15: 0000000000000000
 retint_kernel+0x1b/0x2d
RIP: 0010:preempt_count_add+0x10/0x1b0 kernel/sched/core.c:3226
Code: fd ff ff 4c 89 c7 e8 6f 87 5a 00 e9 ce fd ff ff 66 2e 0f 1f 84 00 00 00 00 00 48 b8 00 00 00 00 00 fc ff df 55 48 89 e5 41 54 <41> 89 fc 53 48 c7 c3 e0 59 5b 8a 48 89 da 48 c1 ea 03 0f b6 14 02
RSP: 0018:ffff88809f01fb98 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff02
RAX: dffffc0000000000 RBX: 0000044a6b90fba0 RCX: 0000000000000000
RDX: 0000000000000004 RSI: ffffffff832fa47c RDI: 0000000000000001
RBP: ffff88809f01fba0 R08: ffff88809f624500 R09: 0000000000000040
R10: 0000000000000040 R11: ffffffff88a43887 R12: 0000044a6b90dfa6
R13: 0000000000000000 R14: 0000000000002ced R15: 0000000000000fd4
 delay_tsc+0x3d/0xc0 arch/x86/lib/delay.c:68
 __delay arch/x86/lib/delay.c:161 [inline]
 __const_udelay+0x5f/0x80 arch/x86/lib/delay.c:175
 try_check_zero+0x201/0x330 kernel/rcu/srcutree.c:709
 srcu_advance_state kernel/rcu/srcutree.c:1146 [inline]
 process_srcu+0x329/0xe20 kernel/rcu/srcutree.c:1241
 process_one_work+0x98e/0x1790 kernel/workqueue.c:2269
 worker_thread+0x98/0xe40 kernel/workqueue.c:2415
 kthread+0x357/0x430 kernel/kthread.c:253
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352