rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	0-....: (1 GPs behind) idle=156/1/0x4000000000000002 softirq=136354/136356 fqs=5248 
rcu: 	 (t=10501 jiffies g=195481 q=3912)
NMI backtrace for cpu 0
CPU: 0 PID: 1106 Comm: kworker/0:4 Not tainted 4.20.0-rc7+ #358
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+0x1d3/0x2c6 lib/dump_stack.c:113
 nmi_cpu_backtrace.cold.4+0x63/0xa2 lib/nmi_backtrace.c:101
 nmi_trigger_cpumask_backtrace+0x1c2/0x22c 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.65+0x1f3/0x3c6 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+0xac1/0x1410 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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x8/0x50 kernel/kcov.c:100
Code: d0 72 1b 49 83 c1 01 4a 89 7c 10 e0 4a 89 74 10 e8 4a 89 54 10 f0 4a 89 4c d8 20 4c 89 08 5d c3 66 90 55 48 89 e5 48 8b 75 08 <65> 48 8b 04 25 40 ee 01 00 65 8b 15 f8 34 83 7e 81 e2 00 01 1f 00
RSP: 0018:ffff888194807330 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 0000000000000000 RBX: ffff88819040e4c0 RCX: ffffffff86cae2b8
RDX: 0000000000000000 RSI: ffffffff86cae523 RDI: 0000000000000000
RBP: ffff888194807330 R08: ffff888191bba000 R09: 0000000000000008
R10: 0000000000000005 R11: ffff888191bba000 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 xfrm_policy_insert_list+0x403/0x1020 net/xfrm/xfrm_policy.c:1533
 xfrm_policy_inexact_insert+0x166/0xee0 net/xfrm/xfrm_policy.c:1195
 xfrm_hash_rebuild+0xfc1/0x1380 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
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 0-... } 10725 jiffies s: 16741 root: 0x1/.
rcu: blocking rcu_node structures:
Task dump for CPU 0:
kworker/0:4     R  running task    19768  1106      2 0x80000008
Workqueue: events xfrm_hash_rebuild
Call Trace:
 context_switch kernel/sched/core.c:2834 [inline]
 __schedule+0x874/0x1ed0 kernel/sched/core.c:3472
 spin_lock_irq include/linux/spinlock.h:354 [inline]
 worker_thread+0x3e0/0x1390 kernel/workqueue.c:2246