======================================
| [   38.939811][  T333] br1: port 5(vx4001) entered blocking state
| [   38.940029][  T333] br1: port 5(vx4001) entered forwarding state
| [   39.550677][    C3] BUG: spinlock bad magic on CPU#3, kworker/3:1/50
| [ 39.551097][ C3] lock: noop_qdisc+0x240/0x300, .magic: 00000000, .owner: kworker/3:1/50, .owner_cpu: 3 
[   39.552034][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   39.552683][    C3] Workqueue: mld mld_ifc_work
[   39.552984][    C3] Call Trace:
[   39.553200][    C3]  <IRQ>
[ 39.553350][ C3] dump_stack_lvl (lib/dump_stack.c:122) 
[ 39.553651][ C3] do_raw_spin_unlock (kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:141) 
[ 39.553938][ C3] _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 39.554214][ C3] __dev_xmit_skb (./include/net/sch_generic.h:226 ./include/net/sch_generic.h:217 net/core/dev.c:3879) 
[ 39.554495][ C3] ? __pfx___dev_xmit_skb (net/core/dev.c:3784) 
[ 39.554766][ C3] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 39.555050][ C3] ? lock_acquire (kernel/locking/lockdep.c:5732) 
[ 39.555318][ C3] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 39.555601][ C3] __dev_queue_xmit (net/core/dev.c:4389) 
[ 39.555859][ C3] ? __build_skb_around (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 net/core/skbuff.c:388 net/core/skbuff.c:445) 
[ 39.556143][ C3] ? __alloc_skb (net/core/skbuff.c:690) 
[ 39.556424][ C3] ? __pfx___alloc_skb (net/core/skbuff.c:647) 
[ 39.556719][ C3] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 39.556997][ C3] ? eth_header (net/ethernet/eth.c:100) 
[ 39.557181][ C3] ? arp_create (net/ipv4/arp.c:639) 
[ 39.557381][ C3] ? arp_send_dst (net/ipv4/arp.c:314 net/ipv4/arp.c:301) 
[ 39.557563][ C3] arp_solicit (net/ipv4/arp.c:392) 
[ 39.557785][ C3] ? __create_object (mm/kmemleak.c:751) 
[ 39.557965][ C3] ? __pfx_arp_solicit (net/ipv4/arp.c:334) 
[ 39.558152][ C3] ? trace_kmem_cache_alloc (./include/trace/events/kmem.h:12 (discriminator 52)) 
[ 39.558372][ C3] ? neigh_probe (net/core/neighbour.c:1076) 
[ 39.558660][ C3] neigh_probe (net/core/neighbour.c:1077) 
[ 39.558816][ C3] __neigh_event_send (net/core/neighbour.c:1244) 
[ 39.558999][ C3] neigh_resolve_output (net/core/neighbour.c:1549) 
[ 39.559170][ C3] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 kernel/softirq.c:387) 
[ 39.559373][ C3] ? ___neigh_create (net/core/neighbour.c:722 (discriminator 9)) 
[ 39.559656][ C3] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 39.559944][ C3] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:227) 
[ 39.560210][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 39.560353][ C3] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 39.560561][ C3] ? __ip_finish_output (./include/linux/skbuff.h:1666 ./include/linux/skbuff.h:4954 net/ipv4/ip_output.c:307 net/ipv4/ip_output.c:295) 
[ 39.560810][ C3] ip_output (./include/linux/netfilter.h:303 net/ipv4/ip_output.c:433) 
[ 39.561007][ C3] ? __pfx_ip_output (net/ipv4/ip_output.c:427) 
[ 39.561282][ C3] ? pskb_expand_head (./arch/x86/include/asm/atomic.h:28 ./include/linux/atomic/atomic-arch-fallback.h:503 ./include/linux/atomic/atomic-instrumented.h:68 net/core/skbuff.c:2308) 
[ 39.561559][ C3] ? ip_local_out (net/ipv4/ip_output.c:128) 
[ 39.561834][ C3] iptunnel_xmit (net/ipv4/ip_tunnel_core.c:84 (discriminator 4)) 
[ 39.562115][ C3] ? vxlan_build_skb.isra.0 (drivers/net/vxlan/vxlan_core.c:2211) vxlan
[ 39.562697][ C3] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2520) vxlan
[ 39.563050][ C3] ? br_handle_frame (net/bridge/br_input.c:424) bridge
[ 39.563306][ C3] ? kernel_text_address (kernel/extable.c:95) 
[ 39.563640][ C3] ? __pfx_vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2336) vxlan
[ 39.563879][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 39.564059][ C3] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 39.564236][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:466 kernel/locking/lockdep.c:5761) 
[ 39.564541][ C3] ? vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2796) vxlan
[ 39.564766][ C3] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2796) vxlan
[ 39.564962][ C3] dev_hard_start_xmit (./include/linux/netdevice.h:4913 ./include/linux/netdevice.h:4922 net/core/dev.c:3580 net/core/dev.c:3596) 
[ 39.565148][ C3] ? validate_xmit_skb.constprop.0 (net/core/dev.c:3651) 
[ 39.565369][ C3] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4424) 
[ 39.565720][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 39.565870][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 39.566072][ C3] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 39.566267][ C3] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 39.566571][ C3] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 39.566757][ C3] ? __br_forward (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 ./include/linux/netfilter.h:271 ./include/linux/netfilter.h:312 net/bridge/br_forward.c:115) bridge
[ 39.566979][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 39.567174][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5724) 
[ 39.567547][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 39.567742][ C3] br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 39.568062][ C3] ? __pfx_br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 39.568321][ C3] ? __br_forward (./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/bridge/br_forward.c:115) bridge
[ 39.568531][ C3] deliver_clone (net/bridge/br_forward.c:132) bridge
[ 39.568749][ C3] br_handle_frame_finish (net/bridge/br_input.c:220) bridge
[ 39.569006][ C3] ? __pfx_br_handle_frame_finish (net/bridge/br_input.c:77) bridge
[ 39.569391][ C3] ? write_profile (kernel/profile.c:210 kernel/profile.c:407) 
[ 39.569575][ C3] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:227) 
[ 39.569755][ C3] ? update_sg_lb_stats.constprop.0 (kernel/sched/fair.c:9822 kernel/sched/fair.c:9849 kernel/sched/fair.c:10005) 
[ 39.569981][ C3] br_handle_frame (net/bridge/br_input.c:424) bridge
[ 39.570197][ C3] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) bridge
[ 39.570582][ C3] __netif_receive_skb_core.constprop.0 (net/core/dev.c:5555) 
[ 39.570826][ C3] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3758 kernel/locking/lockdep.c:3781 kernel/locking/lockdep.c:3836) 
[ 39.571006][ C3] ? __pfx___netif_receive_skb_core.constprop.0 (net/core/dev.c:5448) 
[ 39.571383][ C3] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:227) 
[ 39.571561][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 39.571718][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 39.571894][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 39.572072][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:466 kernel/locking/lockdep.c:5761) 
[ 39.572388][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 39.572633][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 39.572825][ C3] __netif_receive_skb_one_core (net/core/dev.c:5660) 
[ 39.573189][ C3] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5654) 
[ 39.573419][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 39.573598][ C3] ? lock_acquire (kernel/locking/lockdep.c:5732) 
[ 39.573812][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 39.573995][ C3] process_backlog (./include/linux/rcupdate.h:867 net/core/dev.c:6109) 
[ 39.574335][ C3] __napi_poll.constprop.0 (net/core/dev.c:6772) 
[ 39.574538][ C3] net_rx_action (net/core/dev.c:6841 net/core/dev.c:6963) 
[ 39.574744][ C3] ? __pfx_net_rx_action (net/core/dev.c:6925) 
[ 39.575044][ C3] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 39.575247][ C3] ? rcu_core (kernel/rcu/tree.c:2453 kernel/rcu/tree.c:2827) 
[ 39.575545][ C3] ? rcu_report_qs_rnp (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 ./include/linux/cpumask.h:562 ./include/linux/cpumask.h:1141 ./include/trace/events/rcu.h:368 kernel/rcu/tree.c:2302) 
[ 39.575732][ C3] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:227) 
[ 39.575911][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 39.576070][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 39.576578][ C3] handle_softirqs (kernel/softirq.c:554) 
[ 39.576754][ C3] ? __dev_queue_xmit (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:906 net/core/dev.c:4450) 
[ 39.576934][ C3] do_softirq (kernel/softirq.c:455 kernel/softirq.c:442) 
[   39.577067][    C3]  </IRQ>
[   39.577164][    C3]  <TASK>
[ 39.577260][ C3] __local_bh_enable_ip (kernel/softirq.c:382) 
[ 39.577441][ C3] ? __dev_queue_xmit (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:906 net/core/dev.c:4450) 
[ 39.577610][ C3] __dev_queue_xmit (net/core/dev.c:4451) 
[ 39.577789][ C3] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 39.578096][ C3] ? ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[ 39.578292][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 39.578475][ C3] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:227) 
[ 39.578772][ C3] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 39.578952][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 39.579134][ C3] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 39.579503][ C3] ? neigh_hh_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:772 ./include/net/neighbour.h:496) 
[ 39.579708][ C3] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[ 39.579886][ C3] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[ 39.580091][ C3] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[ 39.580224][ C3] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[ 39.580426][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:466 kernel/locking/lockdep.c:5761) 
[ 39.580750][ C3] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 39.581110][ C3] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 39.581301][ C3] ? icmp6_dst_alloc (net/ipv6/route.c:3295) 
[ 39.581502][ C3] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:326 ./include/linux/rcupdate.h:838 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) 
[ 39.581698][ C3] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 39.582021][ C3] ? __pfx_xfrm_lookup_with_ifid (net/xfrm/xfrm_policy.c:3140) 
[ 39.582246][ C3] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 39.582461][ C3] ? icmp6_dst_alloc (net/ipv6/route.c:3295) 
[ 39.582637][ C3] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 kernel/softirq.c:387) 
[ 39.583000][ C3] mld_sendpack (net/ipv6/mcast.c:1822) 
[ 39.583180][ C3] ? __pfx_mld_sendpack (net/ipv6/mcast.c:1779) 
[ 39.583356][ C3] ? mld_send_cr (net/ipv6/mcast.c:2096 (discriminator 11)) 
[ 39.583604][ C3] mld_ifc_work (net/ipv6/mcast.c:2652) 
[ 39.583976][ C3] process_one_work (kernel/workqueue.c:3231) 
[ 39.584172][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 39.584366][ C3] ? __pfx_process_one_work (kernel/workqueue.c:3133) 
[ 39.584541][ C3] ? assign_work (kernel/workqueue.c:1202) 
[ 39.584898][ C3] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3390) 
[ 39.585217][ C3] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 39.585614][ C3] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 39.585795][ C3] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 39.585971][ C3] kthread (kernel/kthread.c:389) 
[ 39.586237][ C3] ? __pfx_kthread (kernel/kthread.c:342) 
[ 39.586584][ C3] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 39.586830][ C3] ? __pfx_kthread (kernel/kthread.c:342) 


Finger prints:
do_raw_spin_unlock:_raw_spin_unlock:__dev_xmit_skb:__dev_queue_xmit:arp_solicit