======================================
| [  435.844147][    C2]  #3: ffffffff9bd91d40 (rcu_read_lock){....}-{1:3}, at: ip_output (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv4/ip_output.c:432 (discriminator 2))
| [  435.844298][    C2]  #4: ffffffff9bd91d40 (rcu_read_lock){....}-{1:3}, at: ip_finish_output2 (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv4/ip_output.c:229 (discriminator 2))
| [  435.844449][    C2]
| [  435.844449][    C2] stack backtrace:
[  435.844560][    C2] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  435.844561][    C2] Call Trace:
[  435.844563][    C2]  <IRQ>
[  435.844564][    C2]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  435.844568][    C2]  print_circular_bug.cold (kernel/locking/lockdep.c:2043)
[  435.844571][    C2]  check_noncircular (kernel/locking/lockdep.c:2175)
[  435.844574][    C2]  check_prev_add (kernel/locking/lockdep.c:3165)
[  435.844576][    C2]  validate_chain (kernel/locking/lockdep.c:3284 kernel/locking/lockdep.c:3908)
[  435.844578][    C2]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  435.844581][    C2]  __lock_acquire (kernel/locking/lockdep.c:5237)
[  435.844583][    C2]  lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  435.844585][    C2]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[  435.844587][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  435.844589][    C2]  ? lock_acquire (./include/trace/events/lock.h:23 (discriminator 22) kernel/locking/lockdep.c:5831 (discriminator 22))
[  435.844591][    C2]  _raw_spin_lock_bh (./include/linux/spinlock_api_smp.h:150 (discriminator 1) kernel/locking/spinlock.c:182 (discriminator 1))
[  435.844593][    C2]  ? ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[  435.844594][    C2]  ___neigh_create (./include/linux/spinlock.h:348 net/core/neighbour.c:670)
[  435.844595][    C2]  ? sync_exp_reset_tree_hotplug (kernel/rcu/tree_exp.h:114)
[  435.844597][    C2]  ip_finish_output2 (./include/net/route.h:411 ./include/net/route.h:425 net/ipv4/ip_output.c:230)
[  435.844599][    C2]  ? ip_dst_mtu_maybe_forward (./include/linux/rcupdate.h:873 ./include/net/ip.h:504)
[  435.844601][    C2]  ? ip4_dst_hoplimit (./include/net/dst.h:582 (discriminator 4) ./include/net/dst.h:587 (discriminator 4) ./include/net/route.h:395 (discriminator 4))
[  435.844603][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  435.844605][    C2]  ip_output (./include/linux/netfilter.h:314 net/ipv4/ip_output.c:437)
[  435.844606][    C2]  ? ip_finish_output (./include/linux/cgroup.h:868)
[  435.844608][    C2]  ? __ip_make_skb (net/ipv4/ip_output.c:1386 net/ipv4/ip_output.c:1497)
[  435.844611][    C2]  ip_push_pending_frames (./include/net/dst.h:470 (discriminator 4) net/ipv4/ip_output.c:131 (discriminator 4) net/ipv4/ip_output.c:1506 (discriminator 4) net/ipv4/ip_output.c:1526 (discriminator 4))
[  435.844613][    C2]  __icmp_send (net/ipv4/icmp.c:1015)
[  435.844616][    C2]  ? icmpv4_global_allow (net/ipv4/icmp.c:303 (discriminator 42))
[  435.844617][    C2]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  435.844619][    C2]  ? rcu_watching_snap_stopped_since (kernel/rcu/tree.c:326)
[  435.844621][    C2]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  435.844625][    C2]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  435.844627][    C2]  ? sched_balance_find_src_group (kernel/sched/fair.c:12797)
[  435.844630][    C2]  ipv4_send_dest_unreach (net/ipv4/route.c:1282)
[  435.844632][    C2]  ? ip_do_redirect (net/ipv4/route.c:873)
[  435.844634][    C2]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  435.844636][    C2]  ipv4_link_failure (net/ipv4/route.c:1289)
[  435.844637][    C2]  arp_error_report (./include/net/dst.h:438 net/ipv4/arp.c:299)
[  435.844639][    C2]  neigh_invalidate (net/core/neighbour.c:1057)
[  435.844641][    C2]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[  435.844642][    C2]  neigh_timer_handler (net/core/neighbour.c:1149)
[  435.844644][    C2]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[  435.844645][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  435.844646][    C2]  call_timer_fn (kernel/time/timer.c:1748)
[  435.844648][    C2]  ? detach_if_pending (./include/linux/list.h:1143)
[  435.844649][    C2]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  435.844651][    C2]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  435.844653][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  435.844654][    C2]  __run_timers (kernel/time/timer.c:1799 kernel/time/timer.c:2374)
[  435.844656][    C2]  ? neigh_periodic_work (net/core/neighbour.c:973 (discriminator 3))
[  435.844657][    C2]  ? __bpf_trace_itimer_expire (./include/trace/events/timer.h:407)
[  435.844659][    C2]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  435.844662][    C2]  ? __rwlock_init (kernel/locking/spinlock_debug.c:48)
[  435.844663][    C2]  run_timer_softirq (kernel/time/timer.c:2386 kernel/time/timer.c:2395 kernel/time/timer.c:2403)
[  435.844665][    C2]  ? clockevents_program_event (kernel/time/clockevents.c:372)
[  435.844668][    C2]  ? __run_timers (./include/trace/events/timer.h:138 (discriminator 19))
[  435.844669][    C2]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  435.844672][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  435.844673][    C2]  handle_softirqs (kernel/softirq.c:622)
[  435.844676][    C2]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[  435.844678][    C2]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[  435.844680][    C2]  irq_exit_rcu (kernel/softirq.c:752)
[  435.844681][    C2]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 37) arch/x86/kernel/apic/apic.c:1062 (discriminator 37))
[  435.844683][    C2]  </IRQ>
[  435.844683][    C2]  <TASK>
[  435.844684][    C2]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  435.844686][    C2]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:674)
[  435.844687][    C2] RIP: 0010:pv_native_safe_halt (./arch/x86/include/asm/irqflags.h:48 arch/x86/kernel/paravirt.c:63)
[  435.844689][    C2] 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
[  435.844691][    C2] RSP: 0018:ffa0000000157e00 EFLAGS: 00000282
[  435.844693][    C2] RAX: 00000000011318b7 RBX: ff11000001bac6c0 RCX: ffffffff980f7f27
[  435.844695][    C2] RDX: ff11000001bac6c0 RSI: ffffffff9b2c4933 RDI: ffffffff9ac7d760
[  435.844695][    C2] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[  435.844696][    C2] R10: 0000000000000002 R11: 0000000000000001 R12: 1ff400000002afc3
[  435.844697][    C2] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
[  435.844698][    C2]  ? cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[  435.844701][    C2]  default_idle (./arch/x86/include/asm/paravirt.h:62 arch/x86/kernel/process.c:768)
[  435.844702][    C2]  default_idle_call (kernel/sched/idle.c:122)
[  435.844704][    C2]  cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[  435.844706][    C2]  ? arch_cpu_idle_exit+0x40/0x40
[  435.844707][    C2]  ? mark_tsc_async_resets (arch/x86/kernel/tsc_sync.c:49)
[  435.844709][    C2]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[  435.844711][    C2]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  435.844712][    C2]  do_idle (kernel/sched/idle.c:355)
[  435.844714][    C2]  cpu_startup_entry (kernel/sched/idle.c:454)
[  435.844716][    C2]  start_secondary (arch/x86/kernel/smpboot.c:312)
[  435.844718][    C2]  ? 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