======================================
| 0
| xx__-> [   25.462748][  T206] basename (206) used greatest stack depth: 24640 bytes left
| [   27.349901][   T62] BUG: spinlock bad magic on CPU#3, kworker/3:2/62
| [ 27.350128][ T62] lock: noop_qdisc+0x240/0x300, .magic: 00000000, .owner: kworker/3:2/62, .owner_cpu: 3 
[   27.350591][   T62] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   27.350866][   T62] Workqueue: mld mld_ifc_work
[   27.351028][   T62] Call Trace:
[   27.351173][   T62]  <TASK>
[ 27.351275][ T62] dump_stack_lvl (lib/dump_stack.c:122) 
[ 27.351471][ T62] do_raw_spin_unlock (kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:141) 
[ 27.351669][ T62] _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 27.351863][ T62] __dev_xmit_skb (./include/net/sch_generic.h:226 ./include/net/sch_generic.h:217 net/core/dev.c:3879) 
[ 27.352061][ T62] ? __pfx___dev_xmit_skb (net/core/dev.c:3784) 
[ 27.352250][ T62] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4291 kernel/locking/lockdep.c:4358) 
[ 27.352494][ T62] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 27.352684][ T62] __dev_queue_xmit (net/core/dev.c:4389) 
[ 27.352882][ T62] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 27.353080][ T62] ? ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137) 
[ 27.353271][ T62] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 27.353467][ T62] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 27.353648][ T62] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 27.353773][ T62] ? eth_header (net/ethernet/eth.c:100) 
[ 27.353900][ T62] ? neigh_resolve_output (./include/linux/netdevice.h:3159 net/core/neighbour.c:1560 net/core/neighbour.c:1545) 
[ 27.354023][ T62] ip6_finish_output2 (./include/net/neighbour.h:542 net/ipv6/ip6_output.c:137) 
[ 27.354150][ T62] ip6_finish_output.constprop.0 (net/ipv6/ip6_output.c:211 net/ipv6/ip6_output.c:222) 
[ 27.354334][ T62] mld_sendpack (net/ipv6/mcast.c:1822) 
[ 27.354465][ T62] ? __pfx_mld_sendpack (net/ipv6/mcast.c:1779) 
[ 27.354595][ T62] ? mld_send_cr (net/ipv6/mcast.c:2096 (discriminator 11)) 
[ 27.354723][ T62] mld_ifc_work (net/ipv6/mcast.c:2652) 
[ 27.354850][ T62] process_one_work (kernel/workqueue.c:3231) 
[ 27.354979][ T62] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 27.355106][ T62] ? __pfx_process_one_work (kernel/workqueue.c:3133) 
[ 27.355235][ T62] ? assign_work (kernel/workqueue.c:1202) 
[ 27.355363][ T62] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3390) 
[ 27.355481][ T62] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 27.355633][ T62] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 27.355759][ T62] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 27.355883][ T62] kthread (kernel/kthread.c:389) 
[ 27.355977][ T62] ? __pfx_kthread (kernel/kthread.c:342) 
[ 27.356104][ T62] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 27.356232][ 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