======================================
| 0
| xx__-> [   26.437475][  T266] ip (266) used greatest stack depth: 23392 bytes left
| [   29.629024][   T62] BUG: spinlock bad magic on CPU#3, kworker/3:2/62
| [ 29.629252][ T62] lock: noop_qdisc+0x240/0x300, .magic: 00000000, .owner: kworker/3:2/62, .owner_cpu: 3 
[   29.629708][   T62] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   29.630019][   T62] Workqueue: mld mld_ifc_work
[   29.630185][   T62] Call Trace:
[   29.630295][   T62]  <TASK>
[ 29.630368][ T62] dump_stack_lvl (lib/dump_stack.c:122) 
[ 29.630515][ T62] do_raw_spin_unlock (kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:141) 
[ 29.630660][ T62] _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 29.630803][ T62] __dev_xmit_skb (./include/net/sch_generic.h:226 ./include/net/sch_generic.h:217 net/core/dev.c:3879) 
[ 29.630944][ T62] ? __pfx___dev_xmit_skb (net/core/dev.c:3784) 
[ 29.631090][ T62] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4291 kernel/locking/lockdep.c:4358) 
[ 29.631267][ T62] __dev_queue_xmit (net/core/dev.c:4389) 
[ 29.631407][ T62] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 29.631545][ T62] ? ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137) 
[ 29.631689][ T62] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 29.631830][ T62] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 29.631970][ T62] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 29.632111][ T62] ? eth_header (net/ethernet/eth.c:100) 
[ 29.632253][ T62] ? neigh_resolve_output (./include/linux/netdevice.h:3159 net/core/neighbour.c:1560 net/core/neighbour.c:1545) 
[ 29.632398][ T62] ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137) 
[ 29.632536][ T62] ip6_finish_output (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[ 29.632674][ T62] ip6_output (./include/linux/netfilter.h:303 net/ipv6/ip6_output.c:243) 
[ 29.632784][ T62] ? __pfx_ip6_output (net/ipv6/ip6_output.c:230) 
[ 29.632936][ T62] ? lock_acquire.part.0 (kernel/locking/lockdep.c:466 kernel/locking/lockdep.c:5761) 
[ 29.633075][ T62] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 29.633215][ T62] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 29.633357][ T62] ? icmp6_dst_alloc (net/ipv6/route.c:3295) 
[ 29.633507][ T62] NF_HOOK.constprop.0 (./include/linux/rcupdate.h:326 ./include/linux/rcupdate.h:838 ./include/linux/netfilter.h:238 ./include/linux/netfilter.h:312) 
[ 29.633661][ T62] ? __pfx_NF_HOOK.constprop.0 (./include/linux/netfilter.h:308) 
[ 29.633811][ T62] ? __pfx_xfrm_lookup_with_ifid (net/xfrm/xfrm_policy.c:3140) 
[ 29.634014][ T62] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.634203][ T62] ? icmp6_dst_alloc (net/ipv6/route.c:3295) 
[ 29.634346][ T62] ? __local_bh_enable_ip (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:97 kernel/softirq.c:387) 
[ 29.634499][ T62] mld_sendpack (net/ipv6/mcast.c:1822) 
[ 29.634643][ T62] ? __pfx_mld_sendpack (net/ipv6/mcast.c:1779) 
[ 29.634798][ T62] ? mld_send_cr (net/ipv6/mcast.c:2096 (discriminator 11)) 
[ 29.634954][ T62] mld_ifc_work (net/ipv6/mcast.c:2652) 
[ 29.635106][ T62] process_one_work (kernel/workqueue.c:3231) 
[ 29.635272][ T62] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 29.635423][ T62] ? __pfx_process_one_work (kernel/workqueue.c:3133) 
[ 29.635650][ T62] ? assign_work (kernel/workqueue.c:1202) 
[ 29.635804][ T62] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3390) 
[ 29.636027][ T62] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 29.636212][ T62] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 29.636359][ T62] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 29.636508][ T62] kthread (kernel/kthread.c:389) 
[ 29.636623][ T62] ? __pfx_kthread (kernel/kthread.c:342) 
[ 29.636775][ T62] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 29.636994][ T62] ? __pfx_kthread (kernel/kthread.c:342) 


Finger prints:
do_raw_spin_unlock:_raw_spin_unlock:__dev_xmit_skb:__dev_queue_xmit:ip6_finish_output2