IPVS: ftp: loaded support on port[0] = 21 rcu: INFO: rcu_preempt self-detected stall on CPU rcu: 0-....: (10499 ticks this GP) idle=67a/1/0x4000000000000002 softirq=23264/23264 fqs=5243 rcu: (t=10500 jiffies g=24073 q=2072) NMI backtrace for cpu 0 CPU: 0 PID: 2974 Comm: kworker/0:2 Not tainted 5.0.0-rc7+ #104 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 Workqueue: events_power_efficient gc_worker Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x172/0x1f0 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 kernel/rcu/tree.c:1348 [inline] check_cpu_stall kernel/rcu/tree.c:1422 [inline] rcu_pending kernel/rcu/tree.c:3018 [inline] rcu_check_callbacks.cold+0x500/0xa4a 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+0x33e/0xde0 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+0x120/0x570 arch/x86/kernel/apic/apic.c:1060 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:807 RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:83 [inline] RIP: 0010:native_queued_spin_lock_slowpath+0xcb/0x970 kernel/locking/qspinlock.c:337 Code: ff df 49 01 c6 41 83 c5 03 be 04 00 00 00 48 89 df e8 09 ff 4e 00 41 0f b6 06 41 38 c5 7c 08 84 c0 0f 85 d1 06 00 00 44 8b 3b <45> 85 ff 75 60 be 04 00 00 00 48 89 df e8 03 ff 4e 00 44 89 f8 f0 RSP: 0000:ffff88809e987948 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: ffffe8ffffc6fb10 RCX: ffffffff8157be27 RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffffe8ffffc6fb10 RBP: ffff88809e987a08 R08: 1ffffd1ffff8df62 R09: fffff91ffff8df63 R10: fffff91ffff8df62 R11: ffffe8ffffc6fb13 R12: 0000000000000001 R13: 0000000000000003 R14: fffff91ffff8df62 R15: 000000000000000e pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:653 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:50 [inline] queued_spin_lock include/asm-generic/qspinlock.h:90 [inline] do_raw_spin_lock+0x20e/0x2e0 kernel/locking/spinlock_debug.c:113 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x37/0x40 kernel/locking/spinlock.c:144 spin_lock include/linux/spinlock.h:329 [inline] nf_ct_add_to_dying_list+0xdb/0x210 net/netfilter/nf_conntrack_core.c:447 nf_ct_delete_from_lists+0x3c1/0x530 net/netfilter/nf_conntrack_core.c:585 nf_ct_delete net/netfilter/nf_conntrack_core.c:612 [inline] nf_ct_delete+0x1d0/0x4c0 net/netfilter/nf_conntrack_core.c:590 nf_ct_kill include/net/netfilter/nf_conntrack.h:221 [inline] nf_ct_gc_expired net/netfilter/nf_conntrack_core.c:654 [inline] nf_ct_gc_expired+0x2c0/0x350 net/netfilter/nf_conntrack_core.c:648 gc_worker+0xafa/0xea0 net/netfilter/nf_conntrack_core.c:1192 process_one_work+0x98e/0x1790 kernel/workqueue.c:2173 worker_thread+0x98/0xe40 kernel/workqueue.c:2319 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: { 0-... } 10526 jiffies s: 2725 root: 0x1/. rcu: blocking rcu_node structures: Task dump for CPU 0: kworker/0:2 R running task 26400 2974 2 0x80000008 Workqueue: events_power_efficient gc_worker Call Trace: