rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (1 GPs behind) idle=de6/1/0x4000000000000002 softirq=182455/182456 fqs=0 
	(t=11244 jiffies g=260669 q=224)
NMI backtrace for cpu 0
CPU: 0 PID: 32681 Comm: kworker/0:0 Not tainted 5.3.0-rc3+ #106
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:830
 </IRQ>
RIP: 0010:preempt_schedule_irq+0xab/0x160 kernel/sched/core.c:4128
Code: 00 00 e8 68 55 12 fa e8 43 6d 3b fa 4c 89 f0 48 c1 e8 03 80 3c 18 00 75 7d 48 83 3d 3e 72 96 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 f3 d2 88 48 c1 e8 03 80
RSP: 0018:ffff888057167ab8 EFLAGS: 00000282 ORIG_RAX: ffffffffffffff13
RAX: 1ffffffff11a5e64 RBX: dffffc0000000000 RCX: 1ffffffff134b48e
RDX: 0000000000000000 RSI: ffffffff8177ee6e RDI: ffffffff873c80cd
RBP: ffff888057167ad8 R08: ffff888053e10440 R09: ffffed1015d06add
R10: ffffed1015d06adc R11: ffff8880ae8356e3 R12: ffffed100a7c2088
R13: ffff888053e10440 R14: ffffffff88d2f320 R15: 0000000000000000
 retint_kernel+0x1b/0x2b
RIP: 0010:preempt_count_add+0x1d/0x160 kernel/sched/core.c:3607
Code: e9 4c ff ff ff 0f 1f 84 00 00 00 00 00 48 c7 c0 80 41 8b 8a 55 48 ba 00 00 00 00 00 fc ff df 48 89 c1 48 89 e5 41 54 83 e0 07 <48> c1 e9 03 53 83 c0 03 89 fb 0f b6 14 11 38 d0 7c 08 84 d2 0f 85
RSP: 0018:ffff888057167b98 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff02
RAX: 0000000000000000 RBX: 00000351f05d84b1 RCX: ffffffff8a8b4180
RDX: dffffc0000000000 RSI: ffffffff833e0bdc RDI: 0000000000000001
RBP: ffff888057167ba0 R08: ffff888053e10440 R09: 0000000000000040
R10: 0000000000000040 R11: ffffffff88e53c27 R12: 00000351f05d7bd7
R13: 0000000000000000 R14: 0000000000002ced R15: 000000000001803a
 delay_tsc+0x3d/0xc0 arch/x86/lib/delay.c:68
 __delay arch/x86/lib/delay.c:161 [inline]
 __const_udelay+0x59/0x80 arch/x86/lib/delay.c:175
 try_check_zero+0x201/0x330 kernel/rcu/srcutree.c:705
 srcu_advance_state kernel/rcu/srcutree.c:1142 [inline]
 process_srcu+0x329/0xe20 kernel/rcu/srcutree.c:1237
 process_one_work+0x9af/0x1740 kernel/workqueue.c:2269
 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