======================================
| [   35.923602][    T9] br1: port 4(veth2) entered blocking state
| [   35.923999][    T9] br1: port 4(veth2) entered forwarding state
| [   36.272988][    C3] BUG: spinlock bad magic on CPU#3, kworker/3:1/52
| [ 36.273274][ C3] lock: noop_qdisc+0x240/0x300, .magic: 00000000, .owner: kworker/3:1/52, .owner_cpu: 3 
[   36.273880][    C3] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   36.274268][    C3] Workqueue: mld mld_ifc_work
[   36.274457][    C3] Call Trace:
[   36.274594][    C3]  <IRQ>
[ 36.274683][ C3] dump_stack_lvl (lib/dump_stack.c:122) 
[ 36.274874][ C3] do_raw_spin_unlock (kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:141) 
[ 36.275056][ C3] _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 36.275241][ C3] __dev_xmit_skb (./include/net/sch_generic.h:226 ./include/net/sch_generic.h:217 net/core/dev.c:3879) 
[ 36.275418][ C3] ? __pfx___dev_xmit_skb (net/core/dev.c:3784) 
[ 36.275597][ C3] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 36.275774][ C3] ? lock_acquire (kernel/locking/lockdep.c:5732) 
[ 36.275949][ C3] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 36.276122][ C3] __dev_queue_xmit (net/core/dev.c:4389) 
[ 36.276295][ 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) 
[ 36.276476][ C3] ? __alloc_skb (net/core/skbuff.c:690) 
[ 36.276655][ C3] ? __pfx___alloc_skb (net/core/skbuff.c:647) 
[ 36.276834][ C3] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 36.277017][ C3] ? eth_header (net/ethernet/eth.c:100) 
[ 36.277192][ C3] ? arp_create (net/ipv4/arp.c:639) 
[ 36.277377][ C3] ? arp_send_dst (net/ipv4/arp.c:314 net/ipv4/arp.c:301) 
[ 36.277551][ C3] arp_solicit (net/ipv4/arp.c:392) 
[ 36.277723][ C3] ? __create_object (mm/kmemleak.c:751) 
[ 36.277895][ C3] ? __pfx_arp_solicit (net/ipv4/arp.c:334) 
[ 36.278066][ C3] ? trace_kmem_cache_alloc (./include/trace/events/kmem.h:12 (discriminator 52)) 
[ 36.278239][ C3] ? neigh_probe (net/core/neighbour.c:1076) 
[ 36.278416][ C3] neigh_probe (net/core/neighbour.c:1077) 
[ 36.278549][ C3] __neigh_event_send (net/core/neighbour.c:1244) 
[ 36.278728][ C3] neigh_resolve_output (net/core/neighbour.c:1549) 
[ 36.278898][ C3] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 kernel/softirq.c:387) 
[ 36.279072][ C3] ? ___neigh_create (net/core/neighbour.c:722 (discriminator 9)) 
[ 36.279247][ C3] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 36.279420][ 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) 
[ 36.279593][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.279724][ C3] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 36.279897][ 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) 
[ 36.280073][ C3] ip_output (./include/linux/netfilter.h:303 net/ipv4/ip_output.c:433) 
[ 36.280211][ C3] ? __pfx_ip_output (net/ipv4/ip_output.c:427) 
[ 36.280390][ 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) 
[ 36.280572][ C3] ? ip_local_out (net/ipv4/ip_output.c:128) 
[ 36.280747][ C3] iptunnel_xmit (net/ipv4/ip_tunnel_core.c:84 (discriminator 4)) 
[ 36.280923][ C3] ? vxlan_build_skb.isra.0 (drivers/net/vxlan/vxlan_core.c:2211) vxlan
[ 36.281150][ C3] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2520) vxlan
[ 36.281342][ C3] ? __pfx_vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2336) vxlan
[ 36.281574][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 36.281751][ C3] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 36.281929][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:466 kernel/locking/lockdep.c:5761) 
[ 36.282103][ C3] ? vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2796) vxlan
[ 36.282302][ C3] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2796) vxlan
[ 36.282525][ 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) 
[ 36.282699][ C3] ? validate_xmit_skb.constprop.0 (net/core/dev.c:3651) 
[ 36.282918][ C3] __dev_queue_xmit (net/core/dev.h:168 net/core/dev.c:4424) 
[ 36.283096][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.283230][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 36.283410][ C3] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 36.283586][ C3] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.283766][ C3] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 36.283941][ 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
[ 36.284161][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 36.284336][ C3] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5724) 
[ 36.284515][ C3] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 36.284701][ C3] br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 36.284948][ C3] ? __pfx_br_dev_queue_push_xmit (net/bridge/br_forward.c:34) bridge
[ 36.285190][ C3] ? __br_forward (./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/bridge/br_forward.c:115) bridge
[ 36.285391][ C3] deliver_clone (net/bridge/br_forward.c:132) bridge
[ 36.285599][ C3] br_handle_frame_finish (net/bridge/br_input.c:220) bridge
[ 36.285850][ C3] ? __pfx_br_handle_frame_finish (net/bridge/br_input.c:77) bridge
[ 36.286102][ C3] ? __kernel_text_address (kernel/extable.c:79) 
[ 36.286277][ 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) 
[ 36.286455][ C3] ? __pfx_validate_chain (kernel/locking/lockdep.c:3824) 
[ 36.286640][ C3] br_handle_frame (net/bridge/br_input.c:424) bridge
[ 36.286849][ C3] ? __pfx_br_handle_frame (net/bridge/br_input.c:326) bridge
[ 36.287093][ C3] __netif_receive_skb_core.constprop.0 (net/core/dev.c:5555) 
[ 36.287316][ C3] ? validate_chain (./include/linux/hash.h:78 kernel/locking/lockdep.c:3758 kernel/locking/lockdep.c:3781 kernel/locking/lockdep.c:3836) 
[ 36.287486][ C3] ? try_to_wake_up (./include/linux/sched.h:2094 kernel/sched/core.c:4171) 
[ 36.287664][ C3] ? __pfx___netif_receive_skb_core.constprop.0 (net/core/dev.c:5448) 
[ 36.287883][ 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) 
[ 36.288065][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.288196][ C3] ? __lock_acquire (kernel/locking/lockdep.c:5142) 
[ 36.288370][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 36.288544][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:466 kernel/locking/lockdep.c:5761) 
[ 36.288721][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 36.288898][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 36.289070][ C3] __netif_receive_skb_one_core (net/core/dev.c:5660) 
[ 36.289287][ C3] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5654) 
[ 36.289504][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 36.289676][ C3] ? lock_acquire (kernel/locking/lockdep.c:5732) 
[ 36.289850][ C3] ? process_backlog (./include/linux/local_lock_internal.h:38 net/core/dev.c:6106) 
[ 36.290030][ C3] process_backlog (./include/linux/rcupdate.h:867 net/core/dev.c:6109) 
[ 36.290206][ C3] __napi_poll.constprop.0 (net/core/dev.c:6772) 
[ 36.290376][ C3] net_rx_action (net/core/dev.c:6841 net/core/dev.c:6963) 
[ 36.290551][ C3] ? __pfx_net_rx_action (net/core/dev.c:6925) 
[ 36.290724][ C3] ? wakeup_preempt (kernel/sched/sched.h:2189 kernel/sched/core.c:2065) 
[ 36.290903][ C3] ? do_raw_spin_unlock (./arch/x86/include/asm/atomic.h:23 ./include/linux/atomic/atomic-arch-fallback.h:457 ./include/linux/atomic/atomic-instrumented.h:33 ./include/asm-generic/qspinlock.h:57 kernel/locking/spinlock_debug.c:101 kernel/locking/spinlock_debug.c:141) 
[ 36.291086][ C3] ? _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 36.291269][ 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) 
[ 36.291449][ C3] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 36.291583][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 36.291764][ C3] handle_softirqs (kernel/softirq.c:554) 
[ 36.291943][ C3] ? __dev_queue_xmit (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:906 net/core/dev.c:4450) 
[ 36.292120][ C3] do_softirq (kernel/softirq.c:455 kernel/softirq.c:442) 
[   36.292253][    C3]  </IRQ>
[   36.292362][    C3]  <TASK>
[ 36.292457][ C3] __local_bh_enable_ip (kernel/softirq.c:382) 
[ 36.292644][ C3] ? __dev_queue_xmit (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:906 net/core/dev.c:4450) 
[ 36.292819][ C3] __dev_queue_xmit (net/core/dev.c:4451) 
[ 36.292995][ C3] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 36.293170][ C3] ? ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[ 36.293345][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 36.293514][ 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) 
[ 36.293683][ C3] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 36.293858][ C3] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 36.294039][ C3] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.294260][ C3] ? neigh_hh_output (./include/linux/seqlock.h:74 ./include/linux/seqlock.h:772 ./include/net/neighbour.h:496) 
[ 36.294436][ C3] ip6_finish_output2 (./include/net/neighbour.h:540 net/ipv6/ip6_output.c:137) 
[ 36.294611][ C3] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[ 36.294792][ C3] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[ 36.294924][ C3] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[ 36.295098][ C3] ? lock_acquire.part.0 (kernel/locking/lockdep.c:466 kernel/locking/lockdep.c:5761) 
[ 36.295270][ C3] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 36.295444][ C3] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 36.295616][ C3] ? icmp6_dst_alloc (net/ipv6/route.c:3295) 
[ 36.295799][ 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) 
[ 36.295984][ C3] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 36.296169][ C3] ? __pfx_xfrm_lookup_with_ifid (net/xfrm/xfrm_policy.c:3140) 
[ 36.296398][ C3] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.296617][ C3] ? icmp6_dst_alloc (net/ipv6/route.c:3295) 
[ 36.296789][ C3] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 kernel/softirq.c:387) 
[ 36.296966][ C3] mld_sendpack (net/ipv6/mcast.c:1822) 
[ 36.297143][ C3] ? __pfx_mld_sendpack (net/ipv6/mcast.c:1779) 
[ 36.297319][ C3] ? mld_send_cr (net/ipv6/mcast.c:2096 (discriminator 11)) 
[ 36.297495][ C3] mld_ifc_work (net/ipv6/mcast.c:2652) 
[ 36.297671][ C3] process_one_work (kernel/workqueue.c:3231) 
[ 36.297850][ C3] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 36.298032][ C3] ? __pfx_process_one_work (kernel/workqueue.c:3133) 
[ 36.298219][ C3] ? assign_work (kernel/workqueue.c:1202) 
[ 36.298393][ C3] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3390) 
[ 36.298569][ C3] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 36.298782][ C3] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 36.298952][ C3] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 36.299248][ C3] kthread (kernel/kthread.c:389) 
[ 36.299379][ C3] ? __pfx_kthread (kernel/kthread.c:342) 
[ 36.299566][ C3] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 36.299852][ C3] ? __pfx_kthread (kernel/kthread.c:342) 


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