======================================
| [   28.597524][  T270] veth3: entered allmulticast mode
| [   28.599359][  T270] veth3: entered promiscuous mode
| [   28.750856][    C1] BUG: spinlock bad magic on CPU#1, swapper/1/0
| [ 28.751070][ C1] lock: noop_qdisc+0x240/0x300, .magic: 00000000, .owner: swapper/1/0, .owner_cpu: 1 
[   28.751518][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   28.751804][    C1] Call Trace:
[   28.751914][    C1]  <IRQ>
[ 28.751981][ C1] dump_stack_lvl (lib/dump_stack.c:122) 
[ 28.752120][ C1] do_raw_spin_unlock (kernel/locking/spinlock_debug.c:100 kernel/locking/spinlock_debug.c:141) 
[ 28.752256][ C1] _raw_spin_unlock (./arch/x86/include/asm/preempt.h:94 ./include/linux/spinlock_api_smp.h:143 kernel/locking/spinlock.c:186) 
[ 28.752403][ C1] __dev_xmit_skb (./include/net/sch_generic.h:226 ./include/net/sch_generic.h:217 net/core/dev.c:3879) 
[ 28.752537][ C1] ? __pfx___dev_xmit_skb (net/core/dev.c:3784) 
[ 28.752676][ C1] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 28.752808][ C1] ? lock_acquire (kernel/locking/lockdep.c:5732) 
[ 28.752938][ C1] ? __dev_queue_xmit (./include/linux/bottom_half.h:20 ./include/linux/rcupdate.h:890 net/core/dev.c:4348) 
[ 28.753070][ C1] __dev_queue_xmit (net/core/dev.c:4389) 
[ 28.753203][ C1] ? __lock_release (kernel/locking/lockdep.c:5435) 
[ 28.753343][ C1] ? ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 28.753477][ C1] ? __pfx___lock_release (kernel/locking/lockdep.c:5411) 
[ 28.753604][ C1] ? __pfx___dev_queue_xmit (net/core/dev.c:4332) 
[ 28.753751][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4273) 
[ 28.753878][ C1] ? eth_header (net/ethernet/eth.c:100) 
[ 28.754010][ C1] ? neigh_resolve_output (./include/linux/netdevice.h:3159 net/core/neighbour.c:1560 net/core/neighbour.c:1545) 
[ 28.754141][ C1] ip_finish_output2 (./include/net/neighbour.h:542 net/ipv4/ip_output.c:235) 
[ 28.754271][ C1] ? find_held_lock (kernel/locking/lockdep.c:5249) 
[ 28.754402][ C1] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 28.754531][ C1] ? igmpv3_send_cr (./include/linux/rcupdate.h:336 ./include/linux/rcupdate.h:869 net/ipv4/igmp.c:719) 
[ 28.754662][ C1] ? __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) 
[ 28.754795][ C1] ip_output (./include/linux/netfilter.h:303 net/ipv4/ip_output.c:433) 
[ 28.754896][ C1] ? __pfx_ip_output (net/ipv4/ip_output.c:427) 
[ 28.755026][ C1] ? igmpv3_send_cr (net/ipv4/igmp.c:721) 
[ 28.755155][ C1] ? ip_local_out (net/ipv4/ip_output.c:128) 
[ 28.755284][ C1] igmp_ifc_timer_expire (net/ipv4/igmp.c:815) 
[ 28.755415][ C1] ? __pfx_igmp_ifc_timer_expire (net/ipv4/igmp.c:809) 
[ 28.755581][ C1] call_timer_fn (kernel/time/timer.c:1792) 
[ 28.755712][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1782) 
[ 28.755848][ C1] ? call_timer_fn (./include/linux/lockdep.h:31 kernel/time/timer.c:1782) 
[ 28.755979][ C1] ? __pfx_call_timer_fn (kernel/time/timer.c:1769) 
[ 28.756107][ C1] ? mark_lock (kernel/locking/lockdep.c:4655 (discriminator 3)) 
[ 28.756207][ C1] __run_timers (kernel/time/timer.c:1844 kernel/time/timer.c:2417) 
[ 28.756338][ C1] ? __pfx_igmp_ifc_timer_expire (net/ipv4/igmp.c:809) 
[ 28.756500][ C1] ? __pfx___run_timers (kernel/time/timer.c:2388) 
[ 28.756633][ C1] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:107 ./include/linux/atomic/atomic-arch-fallback.h:2170 ./include/linux/atomic/atomic-instrumented.h:1302 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 28.756763][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 28.756893][ C1] ? lock_acquire (kernel/locking/lockdep.c:5732) 
[ 28.757029][ C1] ? run_timer_softirq (kernel/time/timer.c:2428 kernel/time/timer.c:2421 kernel/time/timer.c:2437 kernel/time/timer.c:2447) 
[ 28.757163][ C1] run_timer_softirq (kernel/time/timer.c:2429 kernel/time/timer.c:2421 kernel/time/timer.c:2437 kernel/time/timer.c:2447) 
[ 28.757294][ C1] handle_softirqs (kernel/softirq.c:554) 
[ 28.757425][ C1] irq_exit_rcu (kernel/softirq.c:589 kernel/softirq.c:428 kernel/softirq.c:637 kernel/softirq.c:649) 
[ 28.757523][ C1] sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1043 arch/x86/kernel/apic/apic.c:1043) 
[   28.757657][    C1]  </IRQ>
[   28.757724][    C1]  <TASK>
[ 28.757791][ C1] asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:702) 
[ 28.757956][ C1] RIP: 0010:default_idle (./arch/x86/include/asm/irqflags.h:37 ./arch/x86/include/asm/irqflags.h:92 arch/x86/kernel/process.c:743) 
[ 28.758098][ C1] Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d e3 e9 46 00 fb f4 <fa> c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
All code
========
   0:	4c 01 c7             	add    %r8,%rdi
   3:	4c 29 c2             	sub    %r8,%rdx
   6:	e9 72 ff ff ff       	jmp    0xffffffffffffff7d
   b:	90                   	nop
   c:	90                   	nop
   d:	90                   	nop
   e:	90                   	nop
   f:	90                   	nop
  10:	90                   	nop
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
  16:	90                   	nop
  17:	90                   	nop
  18:	90                   	nop
  19:	90                   	nop
  1a:	90                   	nop
  1b:	f3 0f 1e fa          	endbr64
  1f:	66 90                	xchg   %ax,%ax
  21:	0f 00 2d e3 e9 46 00 	verw   0x46e9e3(%rip)        # 0x46ea0b
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	fa                   	cli		<-- trapping instruction
  2b:	c3                   	ret
  2c:	cc                   	int3
  2d:	cc                   	int3
  2e:	cc                   	int3
  2f:	cc                   	int3
  30:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
  37:	00 00 00 00 
  3b:	90                   	nop
  3c:	90                   	nop
  3d:	90                   	nop
  3e:	90                   	nop
  3f:	90                   	nop

Code starting with the faulting instruction
===========================================
   0:	fa                   	cli
   1:	c3                   	ret
   2:	cc                   	int3
   3:	cc                   	int3
   4:	cc                   	int3
   5:	cc                   	int3
   6:	66 66 2e 0f 1f 84 00 	data16 cs nopw 0x0(%rax,%rax,1)
   d:	00 00 00 00 
  11:	90                   	nop
  12:	90                   	nop
  13:	90                   	nop
  14:	90                   	nop
  15:	90                   	nop
[   28.758567][    C1] RSP: 0018:ffffc9000015fdf8 EFLAGS: 00000242
[   28.758735][    C1] RAX: 00000000000629b5 RBX: 1ffff9200002bfc1 RCX: ffffffffb41f2795
[   28.758936][    C1] RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffffb1aa6534
[   28.759136][    C1] RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed1006c170a0
[   28.759329][    C1] R10: ffff8880360b8503 R11: ffff8880360bdd40 R12: 0000000000000000
[   28.759529][    C1] R13: ffff888001b945c0 R14: dffffc0000000000 R15: 0000000000000000
[ 28.759725][ C1] ? ct_kernel_exit.constprop.0 (kernel/context_tracking.c:147) 
[ 28.759855][ C1] ? cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 28.760003][ C1] default_idle_call (./include/linux/cpuidle.h:143 kernel/sched/idle.c:118) 
[ 28.760134][ C1] cpuidle_idle_call (kernel/sched/idle.c:186) 
[ 28.760270][ C1] ? __pfx_cpuidle_idle_call (kernel/sched/idle.c:168) 
[ 28.760400][ C1] ? tsc_verify_tsc_adjust (arch/x86/kernel/tsc_sync.c:59) 
[ 28.760535][ C1] do_idle (kernel/sched/idle.c:326) 
[ 28.760635][ C1] cpu_startup_entry (kernel/sched/idle.c:423 (discriminator 1)) 
[ 28.760765][ C1] start_secondary (arch/x86/kernel/smpboot.c:201 arch/x86/kernel/smpboot.c:281) 
[ 28.760894][ C1] ? __pfx_start_secondary (arch/x86/kernel/smpboot.c:231) 


Finger prints:
do_raw_spin_unlock:_raw_spin_unlock:__dev_xmit_skb:__dev_queue_xmit:ip_finish_output2