rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=64a/1/0x4000000000000002 softirq=201653/201654 fqs=5249 
rcu: 	 (t=10502 jiffies g=275629 q=896)
NMI backtrace for cpu 1
CPU: 1 PID: 7942 Comm: kworker/1:4 Not tainted 4.20.0+ #2
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+0x1db/0x2d0 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.cold+0x227/0x40c kernel/rcu/tree.c:1348
 check_cpu_stall kernel/rcu/tree.c:1422 [inline]
 rcu_pending kernel/rcu/tree.c:3018 [inline]
 rcu_check_callbacks+0xb32/0x1380 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+0x3a7/0x1050 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+0x18d/0x760 arch/x86/kernel/apic/apic.c:1060
 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807
 </IRQ>
RIP: 0010:xfrm_policy_insert_list+0x16a/0xfb0 net/xfrm/xfrm_policy.c:1532
Code: 89 85 48 ff ff ff 48 c1 e8 03 4c 01 e0 48 89 85 40 ff ff ff e8 67 b7 c0 fa 48 8d bb 19 02 00 00 48 89 f8 48 89 fa 48 c1 e8 03 <83> e2 07 42 0f b6 04 20 38 d0 7f 08 84 c0 0f 85 af 0b 00 00 44 0f
RSP: 0018:ffff88806aa8f680 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13
RAX: 1ffff1101415644b RBX: ffff8880a0ab2040 RCX: ffffffff86c0907f
RDX: ffff8880a0ab2259 RSI: ffffffff86c08fc9 RDI: ffff8880a0ab2259
RBP: ffff88806aa8f780 R08: ffff88806aa80340 R09: 0000000000000005
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 xfrm_policy_inexact_insert+0x155/0xda0 net/xfrm/xfrm_policy.c:1195
 xfrm_hash_rebuild+0xea2/0x12c0 net/xfrm/xfrm_policy.c:1317
 process_one_work+0xd0c/0x1ce0 kernel/workqueue.c:2153
 worker_thread+0x143/0x14a0 kernel/workqueue.c:2296
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352