======================================
| [   28.669883][  T280] vxlan0: entered allmulticast mode
| [   28.671122][  T280] vxlan0: entered promiscuous mode
| [   28.673474][    C1] BUG: spinlock bad magic on CPU#1, kworker/1:1/50
| [ 28.673670][ C1] lock: noop_qdisc+0x240/0x300, .magic: 00000000, .owner: kworker/1:1/50, .owner_cpu: 1 
[   28.674118][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.674418][    C1] Workqueue: events linkwatch_event
[   28.674564][    C1] Call Trace:
[   28.674672][    C1]  <IRQ>
[ 28.674744][ C1] dump_stack_lvl (lib/dump_stack.c:122) 
[ 28.674886][ C1] do_raw_spin_unlock (kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:141) 
[ 28.675029][ C1] _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 28.675171][ C1] net_tx_action (./include/net/sch_generic.h:226 ./include/net/sch_generic.h:217 ./include/net/pkt_sched.h:128 ./include/net/pkt_sched.h:124 net/core/dev.c:5323) 
[ 28.675310][ C1] handle_softirqs (kernel/softirq.c:554) 
[ 28.675450][ C1] ? dev_deactivate_many (./include/linux/bottom_half.h:33 ./include/linux/netdevice.h:4448 net/sched/sch_generic.c:571 net/sched/sch_generic.c:1363) 
[ 28.675588][ C1] do_softirq (kernel/softirq.c:455 kernel/softirq.c:442) 
[   28.675688][    C1]  </IRQ>
[   28.675758][    C1]  <TASK>
[ 28.675826][ C1] __local_bh_enable_ip (kernel/softirq.c:382) 
[ 28.675959][ C1] dev_deactivate_many (net/sched/sch_generic.c:1356) 
[ 28.676095][ C1] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 28.676232][ C1] ? __linkwatch_run_queue (net/core/link_watch.c:234) 
[ 28.676373][ C1] dev_deactivate (./include/linux/list.h:111 ./include/linux/list.h:215 ./include/linux/list.h:229 net/sched/sch_generic.c:1398) 
[ 28.676510][ C1] ? __pfx_dev_deactivate (net/sched/sch_generic.c:1393) 
[ 28.676644][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 28.676783][ C1] linkwatch_do_dev (net/core/link_watch.c:177) 
[ 28.676920][ C1] __linkwatch_run_queue (./include/linux/spinlock.h:376 net/core/link_watch.c:236) 
[ 28.677054][ C1] ? trace_lock_acquire (./include/trace/events/lock.h:24 (discriminator 52)) 
[ 28.677190][ C1] ? __pfx___linkwatch_run_queue (net/core/link_watch.c:186) 
[ 28.677358][ C1] ? process_one_work (kernel/workqueue.c:3207) 
[ 28.677495][ C1] ? lock_acquire (kernel/locking/lockdep.c:5732) 
[ 28.677631][ C1] linkwatch_event (net/core/link_watch.c:278) 
[ 28.677766][ C1] process_one_work (kernel/workqueue.c:3231) 
[ 28.677903][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 28.678041][ C1] ? __pfx_process_one_work (kernel/workqueue.c:3133) 
[ 28.678180][ C1] ? assign_work (kernel/workqueue.c:1202) 
[ 28.678315][ C1] worker_thread (kernel/workqueue.c:3306 kernel/workqueue.c:3390) 
[ 28.678450][ C1] ? lockdep_hardirqs_on_prepare (kernel/locking/lockdep.c:4299 kernel/locking/lockdep.c:4358) 
[ 28.678623][ C1] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 28.678758][ C1] ? __pfx_worker_thread (kernel/workqueue.c:3339) 
[ 28.678894][ C1] kthread (kernel/kthread.c:389) 
[ 28.678998][ C1] ? __pfx_kthread (kernel/kthread.c:342) 
[ 28.679132][ C1] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 28.679275][ C1] ? __pfx_kthread (kernel/kthread.c:342) 


Finger prints:
do_raw_spin_unlock:_raw_spin_unlock:net_tx_action:handle_softirqs:do_softirq