rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-...!: (1 ticks this GP) idle=d4e/1/0x4000000000000002 softirq=559497/559502 fqs=0 
	(t=11252 jiffies g=538297 q=450)
NMI backtrace for cpu 1
CPU: 1 PID: 27179 Comm: kworker/1:0 Not tainted 5.2.0-rc5+ #5
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+0x1d8/0x2f8 lib/dump_stack.c:113
 nmi_cpu_backtrace+0x89/0x160 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x125/0x230 lib/nmi_backtrace.c:62
 arch_trigger_cpumask_backtrace+0x10/0x20 arch/x86/kernel/apic/hw_nmi.c:38
 trigger_single_cpu_backtrace include/linux/nmi.h:164 [inline]
 rcu_dump_cpu_stacks+0x15a/0x220 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+0xc10/0x1740 kernel/rcu/tree.c:2161
 update_process_times+0x134/0x190 kernel/time/timer.c:1639
 tick_sched_handle kernel/time/tick-sched.c:167 [inline]
 tick_sched_timer+0x257/0x410 kernel/time/tick-sched.c:1298
 __run_hrtimer kernel/time/hrtimer.c:1389 [inline]
 __hrtimer_run_queues+0x471/0x8b0 kernel/time/hrtimer.c:1451
 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1509
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1041 [inline]
 smp_apic_timer_interrupt+0xee/0x260 arch/x86/kernel/apic/apic.c:1066
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:806
 </IRQ>
RIP: 0010:rdtsc_ordered arch/x86/include/asm/msr.h:236 [inline]
RIP: 0010:delay_tsc+0xad/0xf0 arch/x86/lib/delay.c:61
Code: 44 00 00 66 2e 0f 1f 84 00 00 00 00 00 a8 01 75 ca f3 90 bf 01 00 00 00 e8 60 26 bc f9 e8 5b b5 ca fb 41 39 c7 75 bb 0f 01 f9 <66> 90 48 89 d3 48 c1 e3 20 48 09 c3 4c 29 e3 bf 01 00 00 00 e8 0a
RSP: 0018:ffff888059987ae0 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000045e4c316 RBX: 00000000000006b4 RCX: 0000000000000001
RDX: 00000000000005e9 RSI: 0000000000000001 RDI: 0000000000000000
RBP: ffff888059987b00 R08: ffffffff8360ad1a R09: fffffbfff115fb26
R10: fffffbfff115fb26 R11: 1ffffffff115fb25 R12: 000005e945e4bbdd
R13: 0000000000000001 R14: 0000000000002ced R15: 0000000000000001
 __delay arch/x86/lib/delay.c:161 [inline]
 __const_udelay+0x5e/0x70 arch/x86/lib/delay.c:175
 try_check_zero+0x6e/0x380 kernel/rcu/srcutree.c:705
 srcu_advance_state kernel/rcu/srcutree.c:1142 [inline]
 process_srcu+0x1b7/0xd20 kernel/rcu/srcutree.c:1237
 process_one_work+0x814/0x1130 kernel/workqueue.c:2269
 worker_thread+0xc01/0x1640 kernel/workqueue.c:2415
 kthread+0x325/0x350 kernel/kthread.c:255
 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352