rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 1-...!: (10501 ticks this GP) idle=b8a/1/0x4000000000000002 softirq=225225/225225 fqs=0 rcu: (t=10502 jiffies g=323641 q=1114) rcu: rcu_preempt kthread starved for 10503 jiffies! g323641 f0x0 RCU_GP_WAIT_FQS(5) ->state=0x402 ->cpu=1 rcu: RCU grace-period kthread stack dump: rcu_preempt I21384 10 2 0x80000000 Call Trace: context_switch kernel/sched/core.c:2831 [inline] __schedule+0x8cf/0x21d0 kernel/sched/core.c:3472 schedule+0xfe/0x460 kernel/sched/core.c:3516 schedule_timeout+0x140/0x260 kernel/time/timer.c:1804 rcu_gp_fqs_loop+0x762/0xa80 kernel/rcu/tree.c:1934 rcu_gp_kthread+0x341/0xc70 kernel/rcu/tree.c:2090 kthread+0x35a/0x440 kernel/kthread.c:246 ret_from_fork+0x3a/0x50 arch/x86/entry/entry_64.S:352 NMI backtrace for cpu 1 CPU: 1 PID: 11748 Comm: kworker/1:2 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:selector_cmp net/xfrm/xfrm_policy.c:1391 [inline] RIP: 0010:xfrm_policy_insert_list+0x5b6/0x1020 net/xfrm/xfrm_policy.c:1534 Code: e0 fe ff ff 44 88 bd e8 fe ff ff 4c 8d a8 c8 00 00 00 31 c0 89 c3 e8 79 00 b1 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 04 08 00 00 4c 89 e8 41 RSP: 0018:ffff8881ba08f340 EFLAGS: 00000a02 ORIG_RAX: ffffffffffffff13 RAX: ffff8881d97a3c18 RBX: 0000000000000004 RCX: ffffffff86ce857b RDX: 0000000000000000 RSI: ffffffff86ce84f7 RDI: 0000000000000005 RBP: ffff8881ba08f468 R08: ffff888196b8c600 R09: 0000000000000008 R10: 0000000000000005 R11: ffff888196b8c600 R12: dffffc0000000000 R13: ffff888196966558 R14: ffff8881d97a3c18 R15: 0000000001000000 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 rcu: INFO: rcu_preempt detected expedited stalls on CPUs/tasks: { 1-... } 10936 jiffies s: 33393 root: 0x2/. rcu: blocking rcu_node structures: Task dump for CPU 1: kworker/1:2 R running task 22264 11748 2 0x80000008 Workqueue: events xfrm_hash_rebuild Call Trace: context_switch kernel/sched/core.c:2834 [inline] __schedule+0x8d7/0x21d0 kernel/sched/core.c:3472 spin_lock_irq include/linux/spinlock.h:354 [inline] worker_thread+0x3e0/0x1390 kernel/workqueue.c:2246