======================================
| [ 2012.678793][    C0]  #3: ffffffff9af91d40 (rcu_read_lock){....}-{1:3}, at: ip6_send_skb (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv6/ip6_output.c:2013 (discriminator 2))
| [ 2012.678959][    C0]  #4: ffffffff9af91d40 (rcu_read_lock){....}-{1:3}, at: ip6_output (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv6/ip6_output.c:234 (discriminator 2))
| [ 2012.679126][    C0]
| [ 2012.679126][    C0] stack backtrace:
[ 2012.679248][    C0] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2012.679249][    C0] Call Trace:
[ 2012.679251][    C0]  <IRQ>
[ 2012.679252][    C0]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 2012.679255][    C0]  print_circular_bug.cold (kernel/locking/lockdep.c:2043)
[ 2012.679258][    C0]  check_noncircular (kernel/locking/lockdep.c:2175)
[ 2012.679261][    C0]  check_prev_add (kernel/locking/lockdep.c:3165)
[ 2012.679263][    C0]  validate_chain (kernel/locking/lockdep.c:3284 kernel/locking/lockdep.c:3908)
[ 2012.679266][    C0]  __lock_acquire (kernel/locking/lockdep.c:5237)
[ 2012.679268][    C0]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 2012.679270][    C0]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[ 2012.679272][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 2012.679274][    C0]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 2012.679276][    C0]  _raw_spin_lock_bh (./include/linux/spinlock_api_smp.h:150 (discriminator 1) kernel/locking/spinlock.c:182 (discriminator 1))
[ 2012.679278][    C0]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[ 2012.679279][    C0]  ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[ 2012.679281][    C0]  ip6_finish_output2 (net/ipv6/ip6_output.c:128 (discriminator 1))
[ 2012.679283][    C0]  ? ip6_xmit (net/ipv6/ip6_output.c:328)
[ 2012.679284][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 2012.679286][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 2012.679288][    C0]  ? ip6_mtu (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:871 (discriminator 2) ./include/net/ip6_route.h:384 (discriminator 2) net/ipv6/route.c:3290 (discriminator 2))
[ 2012.679290][    C0]  ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219)
[ 2012.679292][    C0]  ip6_output (./include/linux/netfilter.h:314 net/ipv6/ip6_output.c:246)
[ 2012.679293][    C0]  ? ip6_finish_output (./include/linux/skbuff.h:1178)
[ 2012.679295][    C0]  ? l3mdev_l3_out.constprop.0 (./include/linux/rcupdate.h:873 ./include/net/l3mdev.h:222)
[ 2012.679299][    C0]  ip6_send_skb (net/ipv6/ip6_output.c:2014)
[ 2012.679300][    C0]  icmp6_send (net/ipv6/icmp.c:826)
[ 2012.679303][    C0]  ? icmpv6_push_pending_frames (net/ipv6/icmp.c:291 (discriminator 1))
[ 2012.679304][    C0]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 2012.679308][    C0]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[ 2012.679311][    C0]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 2012.679312][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 2012.679315][    C0]  ip6_link_failure (./include/linux/icmpv6.h:24 net/ipv6/route.c:2869)
[ 2012.679316][    C0]  ndisc_error_report (./include/net/dst.h:438 net/ipv6/ndisc.c:734)
[ 2012.679318][    C0]  neigh_invalidate (net/core/neighbour.c:1057)
[ 2012.679320][    C0]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[ 2012.679321][    C0]  neigh_timer_handler (net/core/neighbour.c:1149)
[ 2012.679323][    C0]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[ 2012.679324][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 2012.679325][    C0]  call_timer_fn (kernel/time/timer.c:1748)
[ 2012.679327][    C0]  ? detach_if_pending (./include/linux/list.h:1143)
[ 2012.679328][    C0]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 2012.679330][    C0]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 2012.679332][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 2012.679333][    C0]  __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2374)
[ 2012.679334][    C0]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[ 2012.679336][    C0]  ? __bpf_trace_itimer_expire (./include/trace/events/timer.h:407)
[ 2012.679338][    C0]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 2012.679340][    C0]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[ 2012.679342][    C0]  run_timer_softirq (kernel/time/timer.c:2386 kernel/time/timer.c:2395 kernel/time/timer.c:2403)
[ 2012.679343][    C0]  ? clockevents_program_event (kernel/time/clockevents.c:372)
[ 2012.679347][    C0]  ? __run_timers (./include/trace/events/timer.h:138 (discriminator 19))
[ 2012.679348][    C0]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 2012.679351][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 2012.679352][    C0]  handle_softirqs (kernel/softirq.c:622)
[ 2012.679354][    C0]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[ 2012.679357][    C0]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[ 2012.679358][    C0]  irq_exit_rcu (kernel/softirq.c:752)
[ 2012.679360][    C0]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 37) arch/x86/kernel/apic/apic.c:1062 (discriminator 37))
[ 2012.679362][    C0]  </IRQ>
[ 2012.679362][    C0]  <TASK>
[ 2012.679363][    C0]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[ 2012.679365][    C0]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:674)
[ 2012.679366][    C0] RIP: 0010:pv_native_safe_halt (./arch/x86/include/asm/irqflags.h:48 arch/x86/kernel/paravirt.c:63)
[ 2012.679368][    C0] Code: 48 8b 3d 44 61 6e 02 e8 1f 00 00 00 48 2b 05 08 22 a7 00 c3 0f 1f 80 00 00 00 00 f3 0f 1e fa eb 07 0f 00 2d a3 dd 19 00 fb f4 <c3> 0f 1f 40 d6 48 83 ec 20 8b 17 49 89 f8 83 e2 fe 41 89 d2 0f 01
All code
========
   0:	48 8b 3d 44 61 6e 02 	mov    0x26e6144(%rip),%rdi        # 0x26e614b
   7:	e8 1f 00 00 00       	call   0x2b
   c:	48 2b 05 08 22 a7 00 	sub    0xa72208(%rip),%rax        # 0xa7221b
  13:	c3                   	ret
  14:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  1b:	f3 0f 1e fa          	endbr64
  1f:	eb 07                	jmp    0x28
  21:	0f 00 2d a3 dd 19 00 	verw   0x19dda3(%rip)        # 0x19ddcb
  28:	fb                   	sti
  29:	f4                   	hlt
  2a:*	c3                   	ret		<-- trapping instruction
  2b:	0f 1f 40 d6          	nopl   -0x2a(%rax)
  2f:	48 83 ec 20          	sub    $0x20,%rsp
  33:	8b 17                	mov    (%rdi),%edx
  35:	49 89 f8             	mov    %rdi,%r8
  38:	83 e2 fe             	and    $0xfffffffe,%edx
  3b:	41 89 d2             	mov    %edx,%r10d
  3e:	0f                   	.byte 0xf
  3f:	01                   	.byte 0x1

Code starting with the faulting instruction
===========================================
   0:	c3                   	ret
   1:	0f 1f 40 d6          	nopl   -0x2a(%rax)
   5:	48 83 ec 20          	sub    $0x20,%rsp
   9:	8b 17                	mov    (%rdi),%edx
   b:	49 89 f8             	mov    %rdi,%r8
   e:	83 e2 fe             	and    $0xfffffffe,%edx
  11:	41 89 d2             	mov    %edx,%r10d
  14:	0f                   	.byte 0xf
  15:	01                   	.byte 0x1
[ 2012.679370][    C0] RSP: 0018:ffffffff9ac07e18 EFLAGS: 00000292
[ 2012.679372][    C0] RAX: 00000000022f84bd RBX: ffffffff9ac30600 RCX: ffffffff972f7f27
[ 2012.679373][    C0] RDX: ffffffff9ac30600 RSI: ffffffff9a4c4933 RDI: ffffffff99e7d760
[ 2012.679374][    C0] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 2012.679375][    C0] R10: 0000000000000000 R11: 0000000000000001 R12: 1ffffffff3580fc6
[ 2012.679376][    C0] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000014770
[ 2012.679377][    C0]  ? cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[ 2012.679380][    C0]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 2012.679381][    C0]  default_idle (./arch/x86/include/asm/paravirt.h:62 arch/x86/kernel/process.c:768)
[ 2012.679382][    C0]  default_idle_call (kernel/sched/idle.c:122)
[ 2012.679383][    C0]  cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[ 2012.679385][    C0]  ? arch_cpu_idle_exit+0x40/0x40
[ 2012.679387][    C0]  ? mark_tsc_async_resets (arch/x86/kernel/tsc_sync.c:49)
[ 2012.679390][    C0]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 2012.679391][    C0]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 2012.679393][    C0]  do_idle (kernel/sched/idle.c:355)
[ 2012.679395][    C0]  cpu_startup_entry (kernel/sched/idle.c:454)
[ 2012.679396][    C0]  rest_init (init/main.c:717)
[ 2012.679398][    C0]  start_kernel (init/main.c:1175)
[ 2012.679400][    C0]  x86_64_start_reservations (arch/x86/kernel/head64.c:310)
[ 2012.679402][    C0]  x86_64_start_kernel (arch/x86/kernel/head64.c:291)


Finger prints:
check_prev_add:validate_chain:__lock_acquire:_raw_spin_lock_bh:___neigh_create