rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=352/1/0x4000000000000002 softirq=166250/166256 fqs=5250 
rcu: 	 (t=10502 jiffies g=228085 q=694)
NMI backtrace for cpu 1
CPU: 1 PID: 22 Comm: kworker/1:1 Not tainted 4.20.0+ #10
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:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:write_comp_data+0x0/0x70 kernel/kcov.c:121
Code: 83 fa 02 75 20 48 8b 88 e0 12 00 00 8b 80 dc 12 00 00 48 8b 11 48 83 c2 01 48 39 d0 76 07 48 89 34 d1 48 89 11 5d c3 0f 1f 00 <65> 4c 8b 04 25 40 ee 01 00 65 8b 05 20 f8 7f 7e a9 00 01 1f 00 75
RSP: 0018:ffff8880a95c7668 EFLAGS: 00000293 ORIG_RAX: ffffffffffffff13
RAX: ffff8880a95b25c0 RBX: ffff88805e9844c0 RCX: ffffffff86bdfebf
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000004
RBP: ffff8880a95c7670 R08: ffff8880a95b25c0 R09: 0000000000000005
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 xfrm_policy_insert_list+0x20f/0xfb0 net/xfrm/xfrm_policy.c:1543
 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
rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-... } 10871 jiffies s: 25109 root: 0x2/.
rcu: blocking rcu_node structures:
Task dump for CPU 1:
kworker/1:1     R  running task    22840    22      2 0x80000008
Workqueue: events xfrm_hash_rebuild
Call Trace:
 context_switch kernel/sched/core.c:2834 [inline]
 __schedule+0x89f/0x1e90 kernel/sched/core.c:3472
 atomic_try_cmpxchg include/asm-generic/atomic-instrumented.h:72 [inline]
 queued_spin_lock include/asm-generic/qspinlock.h:87 [inline]
 do_raw_spin_lock+0x156/0x360 kernel/locking/spinlock_debug.c:113