rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (1 GPs behind) idle=e6a/1/0x4000000000000002 softirq=359774/359775 fqs=5236 rcu: (t=10500 jiffies g=554509 q=926) NMI backtrace for cpu 0 CPU: 0 PID: 21428 Comm: kworker/0:2 Not tainted 4.20.0-rc7+ #357 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events xfrm_hash_rebuild Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x244/0x39d lib/dump_stack.c:113 nmi_cpu_backtrace.cold.2+0x5c/0xa1 lib/nmi_backtrace.c:101 nmi_trigger_cpumask_backtrace+0x1e8/0x22a 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.67+0x1f3/0x3c7 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+0xf3b/0x13f0 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 RIP: 0010:write_comp_data+0x0/0x70 kernel/kcov.c:116 Code: e8 25 ef 43 00 e9 a6 fc ff ff 4c 89 f7 e8 78 ee 43 00 e9 6f fc ff ff e8 ce 63 c9 ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 <55> 48 89 e5 65 4c 8b 04 25 40 ee 01 00 65 8b 05 bc 68 82 7e a9 00 RSP: 0018:ffff8881b189f328 EFLAGS: 00000286 ORIG_RAX: ffffffffffffff13 RAX: ffff8881d304a500 RBX: 0000000000000005 RCX: ffffffff86ce857b RDX: 0000000000000005 RSI: 000000000000000e RDI: 0000000000000005 RBP: ffff8881b189f330 R08: ffff8881d304a500 R09: 0000000000000008 R10: 0000000000000005 R11: ffff8881d304a500 R12: dffffc0000000000 R13: ffff88818f7bd79c R14: ffff88818e50131c R15: 00000000010000e0 selector_cmp net/xfrm/xfrm_policy.c:1390 [inline] xfrm_policy_insert_list+0x62b/0x1020 net/xfrm/xfrm_policy.c:1534 xfrm_policy_inexact_insert+0x166/0xee0 net/xfrm/xfrm_policy.c:1195 xfrm_hash_rebuild+0xfba/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