rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-...!: (10501 ticks this GP) idle=0ee/1/0x4000000000000002 softirq=62016/62016 fqs=0 
rcu: 	 (t=10502 jiffies g=86573 q=1304)
rcu: rcu_preempt kthread starved for 10503 jiffies! g86573 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=0
rcu: RCU grace-period kthread stack dump:
rcu_preempt     I25832    10      2 0x80000000
Call Trace:
 context_switch kernel/sched/core.c:2831 [inline]
 __schedule+0x897/0x1e90 kernel/sched/core.c:3472
 schedule+0xfe/0x350 kernel/sched/core.c:3516
 schedule_timeout+0x14a/0x250 kernel/time/timer.c:1803
 rcu_gp_fqs_loop+0x6ba/0x970 kernel/rcu/tree.c:1948
 rcu_gp_kthread+0x2bb/0xc10 kernel/rcu/tree.c:2105
 kthread+0x357/0x430 kernel/kthread.c:246
 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352
NMI backtrace for cpu 0
CPU: 0 PID: 8182 Comm: kworker/0:5 Not tainted 4.20.0+ #14
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:selector_cmp net/xfrm/xfrm_policy.c:1391 [inline]
RIP: 0010:xfrm_policy_insert_list+0x5e4/0xfb0 net/xfrm/xfrm_policy.c:1534
Code: 0f 85 c9 07 00 00 4c 89 e8 41 8b 16 48 c1 e8 03 42 0f b6 0c 20 4c 89 e8 83 e0 07 83 c0 03 38 c8 7c 08 84 c9 0f 85 8c 07 00 00 <45> 8b 7d 00 89 d7 89 95 38 ff ff ff 44 89 fe e8 a8 e3 c3 fa 8b 95
RSP: 0018:ffff888069397680 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000003 RBX: 0000000000000002 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff86be124f RDI: 0000000000000005
RBP: ffff888069397780 R08: ffff888069378700 R09: 0000000000000005
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff88808a5e1bd0 R14: ffff888066124590 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