======================================
| [ 1885.226520][    C3]  #1: ffffffffa8b91d40 (rcu_read_lock){....}-{1:3}, at: ndisc_send_skb (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv6/ndisc.c:483 (discriminator 2))
| [ 1885.226675][    C3]  #2: ffffffffa8b91d40 (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))
| [ 1885.226825][    C3]
| [ 1885.226825][    C3] stack backtrace:
[ 1885.226940][    C3] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 1885.226941][    C3] Call Trace:
[ 1885.226943][    C3]  <IRQ>
[ 1885.226945][    C3]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 1885.226948][    C3]  print_circular_bug.cold (kernel/locking/lockdep.c:2043)
[ 1885.226951][    C3]  check_noncircular (kernel/locking/lockdep.c:2175)
[ 1885.226954][    C3]  ? mark_usage (kernel/locking/lockdep.c:4674)
[ 1885.226956][    C3]  check_prev_add (kernel/locking/lockdep.c:3165)
[ 1885.226958][    C3]  validate_chain (kernel/locking/lockdep.c:3284 kernel/locking/lockdep.c:3908)
[ 1885.226961][    C3]  __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1885.226963][    C3]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1885.226965][    C3]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[ 1885.226967][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1885.226969][    C3]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[ 1885.226971][    C3]  _raw_spin_lock_bh (./include/linux/spinlock_api_smp.h:150 (discriminator 1) kernel/locking/spinlock.c:182 (discriminator 1))
[ 1885.226972][    C3]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[ 1885.226974][    C3]  ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[ 1885.226975][    C3]  ? pv_native_safe_halt (./arch/x86/include/asm/irqflags.h:48 arch/x86/kernel/paravirt.c:63)
[ 1885.226977][    C3]  ip6_finish_output2 (net/ipv6/ip6_output.c:128 (discriminator 1))
[ 1885.226979][    C3]  ? ip6_xmit (net/ipv6/ip6_output.c:328)
[ 1885.226980][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1885.226982][    C3]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1885.226984][    C3]  ? 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))
[ 1885.226987][    C3]  ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219)
[ 1885.226989][    C3]  ip6_output (./include/linux/netfilter.h:314 net/ipv6/ip6_output.c:246)
[ 1885.226990][    C3]  ? ip6_finish_output (./include/linux/skbuff.h:1178)
[ 1885.226992][    C3]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 1885.226993][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1885.226995][    C3]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1885.226996][    C3]  ? __local_bh_enable_ip (kernel/softirq.c:455)
[ 1885.226999][    C3]  ndisc_send_skb (./include/net/dst.h:470 (discriminator 4) ./include/linux/netfilter.h:325 (discriminator 4) net/ipv6/ndisc.c:513 (discriminator 4))
[ 1885.227001][    C3]  ? ndisc_recv_na (net/ipv6/ndisc.c:984)
[ 1885.227004][    C3]  ? __local_bh_enable_ip (kernel/softirq.c:455)
[ 1885.227006][    C3]  ndisc_send_ns (net/ipv6/ndisc.c:672)
[ 1885.227007][    C3]  ? __ipv6_chk_addr_and_flags (./include/linux/rcupdate.h:310 (discriminator 2) ./include/linux/rcupdate.h:871 (discriminator 2) net/ipv6/addrconf.c:2026 (discriminator 2))
[ 1885.227009][    C3]  ? ndisc_router_discovery (./include/net/ip6_fib.h:343 (discriminator 2))
[ 1885.227011][    C3]  ? __ipv6_chk_addr_and_flags (./include/linux/rcupdate.h:873 net/ipv6/addrconf.c:2026)
[ 1885.227013][    C3]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1885.227014][    C3]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[ 1885.227016][    C3]  ndisc_solicit (net/ipv6/ndisc.c:763)
[ 1885.227017][    C3]  ? ndisc_send_ns (net/ipv6/ndisc.c:673)
[ 1885.227018][    C3]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1885.227020][    C3]  ? neigh_probe (net/core/neighbour.c:1071)
[ 1885.227021][    C3]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[ 1885.227023][    C3]  neigh_probe (net/core/neighbour.c:1073)
[ 1885.227024][    C3]  neigh_timer_handler (net/core/neighbour.c:1168)
[ 1885.227026][    C3]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[ 1885.227027][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1885.227028][    C3]  call_timer_fn (kernel/time/timer.c:1748)
[ 1885.227030][    C3]  ? detach_if_pending (./include/linux/list.h:1143)
[ 1885.227031][    C3]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 1885.227033][    C3]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 1885.227035][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1885.227036][    C3]  __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2374)
[ 1885.227037][    C3]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[ 1885.227039][    C3]  ? __bpf_trace_itimer_expire (./include/trace/events/timer.h:407)
[ 1885.227041][    C3]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 1885.227044][    C3]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[ 1885.227045][    C3]  run_timer_softirq (kernel/time/timer.c:2386 kernel/time/timer.c:2395 kernel/time/timer.c:2403)
[ 1885.227047][    C3]  ? clockevents_program_event (kernel/time/clockevents.c:372)
[ 1885.227050][    C3]  ? __run_timers (./include/trace/events/timer.h:138 (discriminator 19))
[ 1885.227051][    C3]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 1885.227054][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1885.227055][    C3]  handle_softirqs (kernel/softirq.c:622)
[ 1885.227057][    C3]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[ 1885.227059][    C3]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[ 1885.227061][    C3]  irq_exit_rcu (kernel/softirq.c:752)
[ 1885.227063][    C3]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 37) arch/x86/kernel/apic/apic.c:1062 (discriminator 37))
[ 1885.227064][    C3]  </IRQ>
[ 1885.227065][    C3]  <TASK>
[ 1885.227065][    C3]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 1885.227067][    C3]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:674)
[ 1885.227068][    C3] RIP: 0010:pv_native_safe_halt (./arch/x86/include/asm/irqflags.h:48 arch/x86/kernel/paravirt.c:63)
[ 1885.227070][    C3] 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
[ 1885.227072][    C3] RSP: 0018:ffa0000000167e00 EFLAGS: 00000282
[ 1885.227074][    C3] RAX: 00000000057b8189 RBX: ff11000001c80040 RCX: ffffffffa4ef7f27
[ 1885.227075][    C3] RDX: ff11000001c80040 RSI: ffffffffa80c4933 RDI: ffffffffa7a7d760
[ 1885.227076][    C3] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[ 1885.227077][    C3] R10: 0000000000000003 R11: 0000000000000001 R12: 1ff400000002cfc3
[ 1885.227078][    C3] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
[ 1885.227079][    C3]  ? cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[ 1885.227082][    C3]  default_idle (./arch/x86/include/asm/paravirt.h:62 arch/x86/kernel/process.c:768)
[ 1885.227083][    C3]  default_idle_call (kernel/sched/idle.c:122)
[ 1885.227084][    C3]  cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[ 1885.227086][    C3]  ? arch_cpu_idle_exit+0x40/0x40
[ 1885.227088][    C3]  ? mark_tsc_async_resets (arch/x86/kernel/tsc_sync.c:49)
[ 1885.227090][    C3]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 1885.227091][    C3]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[ 1885.227093][    C3]  do_idle (kernel/sched/idle.c:355)
[ 1885.227095][    C3]  cpu_startup_entry (kernel/sched/idle.c:454)
[ 1885.227096][    C3]  start_secondary (arch/x86/kernel/smpboot.c:312)
[ 1885.227098][    C3]  ? set_cpu_sibling_map (arch/x86/kernel/smpboot.c:733 (discriminator 4))


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