======================================
| [   78.769982][    C1]  #1: ffffffffbc1a1cc0 (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))
| [   78.770137][    C1]  #2: ffffffffbc1a1cc0 (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))
| [   78.770288][    C1]
| [   78.770288][    C1] stack backtrace:
[   78.770399][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   78.770401][    C1] Call Trace:
[   78.770402][    C1]  <IRQ>
[   78.770404][    C1]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[   78.770407][    C1]  print_circular_bug.cold (kernel/locking/lockdep.c:2043)
[   78.770410][    C1]  check_noncircular (kernel/locking/lockdep.c:2175)
[   78.770412][    C1]  ? mark_usage (kernel/locking/lockdep.c:4674)
[   78.770414][    C1]  check_prev_add (kernel/locking/lockdep.c:3165)
[   78.770416][    C1]  validate_chain (kernel/locking/lockdep.c:3284 kernel/locking/lockdep.c:3908)
[   78.770419][    C1]  __lock_acquire (kernel/locking/lockdep.c:5237)
[   78.770421][    C1]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   78.770423][    C1]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[   78.770424][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   78.770426][    C1]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[   78.770428][    C1]  _raw_spin_lock_bh (./include/linux/spinlock_api_smp.h:150 (discriminator 1) kernel/locking/spinlock.c:182 (discriminator 1))
[   78.770430][    C1]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[   78.770431][    C1]  ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[   78.770433][    C1]  ? pv_native_safe_halt (./arch/x86/include/asm/irqflags.h:48 arch/x86/kernel/paravirt.c:63)
[   78.770435][    C1]  ip6_finish_output2 (net/ipv6/ip6_output.c:128 (discriminator 1))
[   78.770436][    C1]  ? ip6_xmit (net/ipv6/ip6_output.c:323)
[   78.770437][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   78.770439][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   78.770441][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   78.770443][    C1]  ? 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))
[   78.770446][    C1]  ip6_finish_output (net/ipv6/ip6_output.c:208 net/ipv6/ip6_output.c:219)
[   78.770448][    C1]  ip6_output (./include/linux/netfilter.h:314 net/ipv6/ip6_output.c:246)
[   78.770449][    C1]  ? ip6_finish_output (./include/net/inet_sock.h:338 (discriminator 1))
[   78.770450][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[   78.770452][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   78.770453][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   78.770455][    C1]  ? __local_bh_enable_ip (kernel/softirq.c:455)
[   78.770457][    C1]  ndisc_send_skb (./include/net/dst.h:470 (discriminator 4) ./include/linux/netfilter.h:325 (discriminator 4) net/ipv6/ndisc.c:513 (discriminator 4))
[   78.770459][    C1]  ? ndisc_recv_na (net/ipv6/ndisc.c:984)
[   78.770462][    C1]  ? __local_bh_enable_ip (kernel/softirq.c:455)
[   78.770464][    C1]  ndisc_send_ns (net/ipv6/ndisc.c:672)
[   78.770466][    C1]  ? ndisc_router_discovery (./include/net/ip6_fib.h:343 (discriminator 2))
[   78.770468][    C1]  ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:470 (discriminator 2) kernel/locking/lockdep.c:4411 (discriminator 2))
[   78.770470][    C1]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   78.770471][    C1]  ? _raw_spin_unlock_irqrestore (./include/linux/spinlock_api_smp.h:178 (discriminator 6) kernel/locking/spinlock.c:198 (discriminator 6))
[   78.770473][    C1]  ndisc_solicit (net/ipv6/ndisc.c:763)
[   78.770475][    C1]  ? ndisc_send_ns (net/ipv6/ndisc.c:673)
[   78.770477][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   78.770478][    C1]  ? neigh_probe (net/core/neighbour.c:1071)
[   78.770480][    C1]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[   78.770482][    C1]  neigh_probe (net/core/neighbour.c:1073)
[   78.770483][    C1]  neigh_timer_handler (net/core/neighbour.c:1168)
[   78.770485][    C1]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[   78.770486][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   78.770487][    C1]  call_timer_fn (kernel/time/timer.c:1748)
[   78.770489][    C1]  ? detach_if_pending (./include/linux/list.h:1143)
[   78.770491][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[   78.770493][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[   78.770495][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   78.770496][    C1]  __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2374)
[   78.770498][    C1]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[   78.770500][    C1]  ? __bpf_trace_itimer_expire (./include/trace/events/timer.h:407)
[   78.770501][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[   78.770504][    C1]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[   78.770507][    C1]  run_timer_softirq (kernel/time/timer.c:2386 kernel/time/timer.c:2395 kernel/time/timer.c:2403)
[   78.770508][    C1]  ? clockevents_program_event (kernel/time/clockevents.c:372)
[   78.770511][    C1]  ? __run_timers (./include/trace/events/timer.h:138 (discriminator 19))
[   78.770513][    C1]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[   78.770515][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   78.770517][    C1]  handle_softirqs (kernel/softirq.c:622)
[   78.770519][    C1]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[   78.770521][    C1]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[   78.770522][    C1]  irq_exit_rcu (kernel/softirq.c:752)
[   78.770524][    C1]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 37) arch/x86/kernel/apic/apic.c:1062 (discriminator 37))
[   78.770526][    C1]  </IRQ>
[   78.770526][    C1]  <TASK>
[   78.770527][    C1]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[   78.770528][    C1]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:674)
[   78.770530][    C1] RIP: 0010:pv_native_safe_halt (./arch/x86/include/asm/irqflags.h:48 arch/x86/kernel/paravirt.c:63)
[   78.770532][    C1] Code: 48 8b 3d 44 21 f6 01 e8 1f 00 00 00 48 2b 05 08 42 91 00 c3 0f 1f 80 00 00 00 00 f3 0f 1e fa eb 07 0f 00 2d a3 4d 0d 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 21 f6 01 	mov    0x1f62144(%rip),%rdi        # 0x1f6214b
   7:	e8 1f 00 00 00       	call   0x2b
   c:	48 2b 05 08 42 91 00 	sub    0x914208(%rip),%rax        # 0x91421b
  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 4d 0d 00 	verw   0xd4da3(%rip)        # 0xd4dcb
  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
[   78.770534][    C1] RSP: 0018:ffa0000000147e00 EFLAGS: 00000282
[   78.770536][    C1] RAX: 000000000043440b RBX: ff11000001bc2380 RCX: ffffffffb8ee6de7
[   78.770538][    C1] RDX: ff11000001bc2380 RSI: ffffffffbbc358e3 RDI: ffffffffbb67a8e0
[   78.770538][    C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[   78.770539][    C1] R10: 0000000000000001 R11: 0000000000000001 R12: 1ff4000000028fc3
[   78.770540][    C1] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
[   78.770541][    C1]  ? cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[   78.770544][    C1]  default_idle (./arch/x86/include/asm/paravirt.h:62 arch/x86/kernel/process.c:768)
[   78.770545][    C1]  default_idle_call (kernel/sched/idle.c:122)
[   78.770547][    C1]  cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[   78.770549][    C1]  ? arch_cpu_idle_exit+0x40/0x40
[   78.770551][    C1]  ? mark_tsc_async_resets (arch/x86/kernel/tsc_sync.c:49)
[   78.770552][    C1]  ? trace_sched_exit_tp (./include/linux/instrumented.h:82 ./include/asm-generic/bitops/instrumented-non-atomic.h:141 ./include/linux/cpumask.h:651 ./include/linux/cpumask.h:1233 ./include/trace/events/sched.h:886)
[   78.770555][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[   78.770556][    C1]  do_idle (kernel/sched/idle.c:355)
[   78.770558][    C1]  cpu_startup_entry (kernel/sched/idle.c:454)
[   78.770559][    C1]  start_secondary (arch/x86/kernel/smpboot.c:312)
[   78.770561][    C1]  ? 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