rcu: INFO: rcu_preempt self-detected stall on CPU
rcu: 	1-....: (1 GPs behind) idle=b12/1/0x4000000000000002 softirq=375128/375132 fqs=5243 
rcu: 	 (t=10500 jiffies g=542149 q=2962)
NMI backtrace for cpu 1
CPU: 1 PID: 6315 Comm: kworker/1:0 Not tainted 5.0.0-rc3+ #37
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+0x5ae/0xfb0 net/xfrm/xfrm_policy.c:1534
Code: 00 ff ff ff 44 88 bd 0c ff ff ff 4c 8d a8 c8 00 00 00 31 c0 89 c3 e8 f1 c3 c3 fa 4c 89 f0 48 c1 e8 03 42 0f b6 14 20 4c 89 f0 <83> e0 07 83 c0 03 38 d0 7c 08 84 d2 0f 85 c9 07 00 00 4c 89 e8 41
RSP: 0018:ffff8880623c7680 EFLAGS: 00000a06 ORIG_RAX: ffffffffffffff13
RAX: ffff8880951f3318 RBX: 0000000000000004 RCX: ffffffff86be3b83
RDX: 0000000000000000 RSI: ffffffff86be3aff RDI: 0000000000000005
RBP: ffff8880623c7780 R08: ffff88808a362580 R09: 0000000000000005
R10: 0000000000000000 R11: 0000000000000001 R12: dffffc0000000000
R13: ffff888066924598 R14: ffff8880951f3318 R15: 0000000001000000
 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-... } 10700 jiffies s: 50881 root: 0x2/.
rcu: blocking rcu_node structures:
Task dump for CPU 1:
kworker/1:0     R  running task    23176  6315      2 0x80000008
Workqueue: events xfrm_hash_rebuild
Call Trace:
 context_switch kernel/sched/core.c:2834 [inline]
 __schedule+0x89f/0x1e60 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