rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=8ca/1/0x4000000000000002 softirq=74657/74660 fqs=5233 
rcu: 	 (t=10500 jiffies g=106097 q=404)
NMI backtrace for cpu 0
CPU: 0 PID: 2937 Comm: kworker/0:2 Not tainted 4.20.0-rc7+ #357
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: events xfrm_hash_rebuild
Call Trace:
 <IRQ>
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x244/0x39d lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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+0x16f/0x1bc kernel/rcu/tree.c:1195
 print_cpu_stall.cold.67+0x1f3/0x3c7 kernel/rcu/tree.c:1334
 check_cpu_stall kernel/rcu/tree.c:1408 [inline]
 rcu_pending kernel/rcu/tree.c:2961 [inline]
 rcu_check_callbacks+0xf3b/0x13f0 kernel/rcu/tree.c:2506
 update_process_times+0x2d/0x70 kernel/time/timer.c:1636
 tick_sched_handle+0x9f/0x180 kernel/time/tick-sched.c:164
 tick_sched_timer+0x45/0x130 kernel/time/tick-sched.c:1274
 __run_hrtimer kernel/time/hrtimer.c:1398 [inline]
 __hrtimer_run_queues+0x41c/0x10d0 kernel/time/hrtimer.c:1460
 hrtimer_interrupt+0x313/0x780 kernel/time/hrtimer.c:1518
 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1034 [inline]
 smp_apic_timer_interrupt+0x1a1/0x760 arch/x86/kernel/apic/apic.c:1059
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:selector_cmp net/xfrm/xfrm_policy.c:1391 [inline]
RIP: 0010:xfrm_policy_insert_list+0x5a2/0x1020 net/xfrm/xfrm_policy.c:1534
Code: 00 b1 fa 48 8b 85 30 ff ff ff 4c 8d b3 c8 00 00 00 48 89 9d e0 fe ff ff 44 88 bd e8 fe ff ff 4c 8d a8 c8 00 00 00 31 c0 89 c3 <e8> 79 00 b1 fa 4c 89 f0 48 c1 e8 03 42 0f b6 14 20 4c 89 f0 83 e0
RSP: 0018:ffff8881cbcd7340 EFLAGS: 00000297 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: 0000000000000003 RCX: ffffffff86ce857b
RDX: 0000000000000003 RSI: 000000000000000e RDI: 0000000000000005
RBP: ffff8881cbcd7468 R08: ffff8881cbd6c240 R09: 0000000000000008
R10: 0000000000000005 R11: ffff8881cbd6c240 R12: dffffc0000000000
R13: ffff8881d169c554 R14: ffff8881b28ef754 R15: 0000000000000000
 xfrm_policy_inexact_insert+0x166/0xee0 net/xfrm/xfrm_policy.c:1195
 xfrm_hash_rebuild+0xfba/0x1380 net/xfrm/xfrm_policy.c:1317
 process_one_work+0xc90/0x1c40 kernel/workqueue.c:2153
 worker_thread+0x17f/0x1390 kernel/workqueue.c:2296
 kthread+0x35a/0x440 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352