rcu: INFO: rcu_preempt detected stalls on CPUs/tasks: (detected by 1, t=10502 jiffies, g=7525, q=67) rcu: All QSes seen, last rcu_preempt kthread activity 10503 (4294965690-4294955187), jiffies_till_next_fqs=1, root ->qsmask 0x0 kworker/1:0 R running task 28072 17 2 0x80004008 Workqueue: ipv6_addrconf addrconf_dad_work Call Trace: sched_show_task+0x348/0x400 kernel/sched/core.c:5758 print_other_cpu_stall kernel/rcu/tree_stall.h:410 [inline] check_cpu_stall kernel/rcu/tree_stall.h:536 [inline] rcu_pending kernel/rcu/tree.c:2736 [inline] rcu_sched_clock_irq+0x1597/0x16d0 kernel/rcu/tree.c:2183 update_process_times+0x134/0x190 kernel/time/timer.c:1639 tick_sched_handle kernel/time/tick-sched.c:167 [inline] tick_sched_timer+0x263/0x420 kernel/time/tick-sched.c:1296 __run_hrtimer kernel/time/hrtimer.c:1389 [inline] __hrtimer_run_queues+0x403/0x850 kernel/time/hrtimer.c:1451 hrtimer_interrupt+0x38c/0xda0 kernel/time/hrtimer.c:1509 local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1106 [inline] smp_apic_timer_interrupt+0x109/0x280 arch/x86/kernel/apic/apic.c:1131 apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:830 RIP: 0010:atomic_read include/asm-generic/atomic-instrumented.h:26 [inline] RIP: 0010:virt_spin_lock arch/x86/include/asm/qspinlock.h:83 [inline] RIP: 0010:native_queued_spin_lock_slowpath+0x92/0x9e0 kernel/locking/qspinlock.c:325 Code: 84 c0 74 54 44 89 f9 80 e1 07 80 c1 03 38 c1 7c 47 4c 89 ff e8 5f f4 51 00 eb 3d 0f 1f 00 66 2e 0f 1f 84 00 00 00 00 00 f3 90 <4c> 89 ff be 04 00 00 00 e8 71 c5 51 00 42 0f b6 04 2b 84 c0 74 18 RSP: 0018:ffff8880aeb09088 EFLAGS: 00000202 ORIG_RAX: ffffffffffffff13 RAX: 0000000000000000 RBX: 1ffff11012e7e8b5 RCX: ffffffff815a93ef RDX: 0000000000000000 RSI: 0000000000000004 RDI: ffff8880973f45a8 RBP: ffff8880aeb09100 R08: dffffc0000000000 R09: ffffed1012e7e8b6 R10: ffffed1012e7e8b6 R11: 0000000000000000 R12: ffff8880973f45b0 R13: dffffc0000000000 R14: 0000000000000001 R15: ffff8880973f45a8 pv_queued_spin_lock_slowpath arch/x86/include/asm/paravirt.h:654 [inline] queued_spin_lock_slowpath arch/x86/include/asm/qspinlock.h:50 [inline] queued_spin_lock include/asm-generic/qspinlock.h:81 [inline] do_raw_spin_lock+0x1d6/0x2d0 kernel/locking/spinlock_debug.c:113 __raw_spin_lock include/linux/spinlock_api_smp.h:143 [inline] _raw_spin_lock+0x39/0x40 kernel/locking/spinlock.c:151 spin_lock include/linux/spinlock.h:338 [inline] __dev_xmit_skb net/core/dev.c:3502 [inline] __dev_queue_xmit+0xde0/0x3020 net/core/dev.c:3838 dev_queue_xmit+0x17/0x20 net/core/dev.c:3902 br_dev_queue_push_xmit+0x551/0x650 net/bridge/br_forward.c:52 br_nf_dev_queue_xmit+0x312/0x1590 include/linux/skbuff.h:4084 NF_HOOK include/linux/netfilter.h:305 [inline] br_nf_post_routing+0xa5f/0xea0 net/bridge/br_netfilter_hooks.c:844 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xc8/0x210 net/netfilter/core.c:512 nf_hook+0x23a/0x310 include/linux/netfilter.h:260 NF_HOOK include/linux/netfilter.h:303 [inline] br_forward_finish+0x7a/0xc0 net/bridge/br_forward.c:65 br_nf_hook_thresh net/bridge/br_netfilter_hooks.c:1014 [inline] br_nf_forward_finish+0x8f4/0xc80 net/bridge/br_netfilter_hooks.c:560 NF_HOOK include/linux/netfilter.h:305 [inline] br_nf_forward_ip+0xed4/0x13f0 net/bridge/br_netfilter_hooks.c:630 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_slow+0xc8/0x210 net/netfilter/core.c:512 nf_hook+0x23a/0x310 include/linux/netfilter.h:260 NF_HOOK include/linux/netfilter.h:303 [inline] __br_forward+0x39e/0x720 net/bridge/br_forward.c:109 br_flood+0x7af/0x840 net/bridge/br_forward.c:234 br_handle_frame_finish+0xf37/0x1370 net/bridge/br_input.c:162 br_nf_hook_thresh+0x306/0x390 net/bridge/br_netfilter_hooks.c:1014 br_nf_pre_routing_finish_ipv6+0x8ac/0xb30 net/bridge/br_netfilter_ipv6.c:187 NF_HOOK include/linux/netfilter.h:305 [inline] br_nf_pre_routing_ipv6+0x2ab/0x350 net/bridge/br_netfilter_ipv6.c:236 br_nf_pre_routing+0x6ca/0x1380 net/bridge/br_netfilter_hooks.c:501 nf_hook_entry_hookfn include/linux/netfilter.h:135 [inline] nf_hook_bridge_pre net/bridge/br_input.c:223 [inline] br_handle_frame+0x7d9/0xeb0 net/bridge/br_input.c:348 __netif_receive_skb_core+0x1a7d/0x3470 net/core/dev.c:4905 __netif_receive_skb_one_core net/core/dev.c:5002 [inline] __netif_receive_skb+0xc5/0x370 net/core/dev.c:5118 process_backlog+0x4d8/0x910 net/core/dev.c:5929 napi_poll net/core/dev.c:6352 [inline] net_rx_action+0x5ef/0xfd0 net/core/dev.c:6418 __do_softirq+0x333/0x7c4 arch/x86/include/asm/paravirt.h:778 do_softirq_own_stack+0x2a/0x40 arch/x86/entry/entry_64.S:1082 do_softirq+0xfd/0x190 kernel/softirq.c:337 __local_bh_enable_ip+0x194/0x240 kernel/softirq.c:189 local_bh_enable+0x1f/0x30 include/linux/bottom_half.h:32 rcu_read_unlock_bh include/linux/rcupdate.h:681 [inline] ip6_finish_output2+0x109f/0x13d0 net/ipv6/ip6_output.c:117 __ip6_finish_output+0x693/0x910 net/ipv6/ip6_output.c:142 ip6_finish_output+0x52/0x1e0 net/ipv6/ip6_output.c:152 NF_HOOK_COND include/linux/netfilter.h:294 [inline] ip6_output+0x26f/0x390 net/ipv6/ip6_output.c:175 dst_output include/net/dst.h:436 [inline] NF_HOOK include/linux/netfilter.h:305 [inline] ndisc_send_skb+0xa35/0xe40 net/ipv6/ndisc.c:504 ndisc_send_ns+0x5ce/0x7b0 net/ipv6/ndisc.c:646 addrconf_dad_work+0xe40/0x1c20 net/ipv6/addrconf.c:4120 process_one_work+0x7ef/0x10e0 kernel/workqueue.c:2269 worker_thread+0xc01/0x1630 kernel/workqueue.c:2415 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352 rcu: rcu_preempt kthread starved for 10552 jiffies! g7525 f0x2 RCU_GP_WAIT_FQS(5) ->state=0x0 ->cpu=0 rcu: RCU grace-period kthread stack dump: rcu_preempt R running task 29080 10 2 0x80004000 Call Trace: context_switch kernel/sched/core.c:3254 [inline] __schedule+0x877/0xc50 kernel/sched/core.c:3880 schedule+0x131/0x1e0 kernel/sched/core.c:3947 schedule_timeout+0x14f/0x240 kernel/time/timer.c:1807 rcu_gp_fqs_loop kernel/rcu/tree.c:1611 [inline] rcu_gp_kthread+0xef8/0x1790 kernel/rcu/tree.c:1768 kthread+0x332/0x350 kernel/kthread.c:255 ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352