======================================
| [  825.209042][    C1]  #1: ffffffffa6b7dd40 (rcu_read_lock){....}-{1:3}, at: ip_local_deliver_finish (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv4/ip_input.c:240 (discriminator 2))
| [  825.209363][    C1]  #2: ff110000183c2f68 (&vxlan->hash_lock){+.-.}-{3:3}, at: vxlan_snoop (./include/linux/spinlock.h:342 drivers/net/vxlan/vxlan_core.c:1487) vxlan
| [  825.209674][    C1]
| [  825.209674][    C1] stack backtrace:
[  825.209874][    C1] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[  825.209875][    C1] Call Trace:
[  825.209877][    C1]  <IRQ>
[  825.209879][    C1]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[  825.209885][    C1]  lockdep_rcu_suspicious.cold (kernel/locking/lockdep.c:6876)
[  825.209891][    C1] vxlan_fdb_create (drivers/net/vxlan/vxlan_core.c:872 (discriminator 8)) vxlan
[  825.209896][    C1]  ? vxlan_find_mac_rcu (./include/linux/rhashtable.h:648 (discriminator 8) ./include/linux/rhashtable.h:673 (discriminator 8) drivers/net/vxlan/vxlan_core.c:396 (discriminator 8)) vxlan
[  825.209903][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  825.209907][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  825.209911][    C1]  ? vxlan_open (drivers/net/vxlan/vxlan_core.c:3030) vxlan
[  825.209915][    C1]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[  825.209917][    C1]  ? rcu_read_lock_any_held (./include/linux/lockdep.h:249 kernel/rcu/update.c:386 kernel/rcu/update.c:380)
[  825.209923][    C1] vxlan_fdb_update (drivers/net/vxlan/vxlan_core.c:1095 drivers/net/vxlan/vxlan_core.c:1138) vxlan
[  825.209929][    C1]  ? vxlan_fdb_create (./arch/x86/include/asm/bitops.h:202 (discriminator 1)) vxlan
[  825.209933][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  825.209935][    C1]  ? do_raw_spin_lock (./include/linux/instrumented.h:55 ./include/linux/atomic/atomic-instrumented.h:1301 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116)
[  825.209939][    C1] vxlan_snoop (drivers/net/vxlan/vxlan_core.c:1491) vxlan
[  825.209945][    C1]  ? __iptunnel_pull_header (net/ipv4/ip_tunnel_core.c:136)
[  825.209950][    C1] vxlan_rcv (drivers/net/vxlan/vxlan_core.c:1634 (discriminator 1) drivers/net/vxlan/vxlan_core.c:1772 (discriminator 1)) vxlan
[  825.209954][    C1]  ? fib_table_lookup (net/ipv4/fib_trie.c:1613)
[  825.209958][    C1]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  825.209963][    C1]  ? encap_bypass_if_local (drivers/net/vxlan/vxlan_core.c:2353) vxlan
[  825.209968][    C1]  ? udp4_lib_lookup2 (net/ipv4/udp.c:488)
[  825.209971][    C1]  ? udp4_lib_lookup2 (./include/net/net_namespace.h:419 (discriminator 1) ./include/net/sock.h:713 (discriminator 1) net/ipv4/udp.c:371 (discriminator 1) net/ipv4/udp.c:475 (discriminator 1))
[  825.209975][    C1]  ? __udp4_lib_lookup (net/ipv4/udp.c:714)
[  825.209979][    C1]  ? encap_bypass_if_local (drivers/net/vxlan/vxlan_core.c:2353) vxlan
[  825.209983][    C1]  ? udp_queue_rcv_one_skb (net/ipv4/udp.c:2389)
[  825.209984][    C1]  udp_queue_rcv_one_skb (net/ipv4/udp.c:2389)
[  825.209986][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  825.209988][    C1]  ? perf_trace_lock_acquire (./include/trace/stages/stage5_get_offsets.h:16 ./include/trace/events/lock.h:23 ./include/trace/events/lock.h:23 ./include/trace/events/lock.h:23)
[  825.209991][    C1]  udp_unicast_rcv_skb (net/ipv4/udp.c:2577)
[  825.209994][    C1]  ? udp_rcv (net/ipv4/udp.c:742 (discriminator 3) net/ipv4/udp.c:2652 (discriminator 3))
[  825.209996][    C1]  udp_rcv (net/ipv4/udp.c:2654)
[  825.210001][    C1]  ? udp_sk_rx_dst_set (net/ipv4/udp.c:2452 (discriminator 1))
[  825.210004][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  825.210006][    C1]  ? ip_local_deliver_finish (./include/linux/rcupdate.h:300 (discriminator 2) ./include/linux/rcupdate.h:840 (discriminator 2) net/ipv4/ip_input.c:240 (discriminator 2))
[  825.210010][    C1]  ip_protocol_deliver_rcu (net/ipv4/ip_input.c:207)
[  825.210013][    C1]  ? process_backlog (./include/linux/local_lock_internal.h:62 (discriminator 2) net/core/dev.c:6673 (discriminator 2))
[  825.210015][    C1]  ip_local_deliver_finish (net/ipv4/ip_input.c:241 (discriminator 1))
[  825.210018][    C1]  ip_local_deliver (./include/linux/netfilter.h:325 ./include/linux/netfilter.h:319 net/ipv4/ip_input.c:262)
[  825.210021][    C1]  ? ip_local_deliver_finish (net/ipv4/ip_input.c:232 (discriminator 42))
[  825.210023][    C1]  ? ip_rcv_finish_core (./include/linux/skbuff.h:1162 (discriminator 2) ./include/net/route.h:88 (discriminator 2) net/ipv4/ip_input.c:435 (discriminator 2))
[  825.210025][    C1]  ? __asan_memset (mm/kasan/shadow.c:84 (discriminator 1))
[  825.210032][    C1]  ? process_backlog (./include/linux/local_lock_internal.h:62 (discriminator 2) net/core/dev.c:6673 (discriminator 2))
[  825.210033][    C1]  ip_rcv (./include/linux/netfilter.h:325 ./include/linux/netfilter.h:319 net/ipv4/ip_input.c:612)
[  825.210036][    C1]  ? ip_local_deliver (./include/linux/rcupdate.h:869 (discriminator 3))
[  825.210039][    C1]  ? mark_usage (kernel/locking/lockdep.c:4674)
[  825.210042][    C1]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[  825.210044][    C1]  ? netdev_upper_dev_unlink (net/core/dev.c:9062)
[  825.210047][    C1]  __netif_receive_skb_one_core (net/core/dev.c:6234)
[  825.210050][    C1]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[  825.210052][    C1]  ? __netif_receive_skb_list_core (net/core/dev.c:6280 (discriminator 2))
[  825.210054][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  825.210059][    C1]  process_backlog (net/core/dev.c:6675)
[  825.210064][    C1]  __napi_poll (net/core/dev.c:7734)
[  825.210067][    C1]  net_rx_action (net/core/dev.c:7797 net/core/dev.c:7954)
[  825.210072][    C1]  ? __napi_poll (./include/net/gro.h:507)
[  825.210076][    C1]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[  825.210082][    C1]  ? _raw_spin_unlock_irq (./include/linux/spinlock_api_smp.h:188 (discriminator 1) kernel/locking/spinlock.c:206 (discriminator 1))
[  825.210085][    C1]  ? run_timer_softirq (kernel/time/timer.c:2387 kernel/time/timer.c:2395 kernel/time/timer.c:2403)
[  825.210088][    C1]  ? clockevents_program_event (kernel/time/clockevents.c:372)
[  825.210095][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  825.210099][    C1]  handle_softirqs (kernel/softirq.c:622)
[  825.210104][    C1]  ? _local_bh_enable (kernel/softirq.c:405 (discriminator 1))
[  825.210109][    C1]  __irq_exit_rcu (kernel/softirq.c:656 kernel/softirq.c:496 kernel/softirq.c:735)
[  825.210111][    C1]  irq_exit_rcu (kernel/softirq.c:752)
[  825.210113][    C1]  sysvec_apic_timer_interrupt (arch/x86/kernel/apic/apic.c:1062 (discriminator 37) arch/x86/kernel/apic/apic.c:1062 (discriminator 37))
[  825.210116][    C1]  </IRQ>
[  825.210117][    C1]  <TASK>
[  825.210117][    C1]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[  825.210120][    C1]  asm_sysvec_apic_timer_interrupt (./arch/x86/include/asm/idtentry.h:674)
[  825.210122][    C1] RIP: 0010:pv_native_safe_halt (./arch/x86/include/asm/irqflags.h:48 arch/x86/kernel/paravirt.c:63)
[  825.210125][    C1] Code: 48 8b 3d 44 91 fb 01 e8 1f 00 00 00 48 2b 05 08 42 9b 00 c3 0f 1f 80 00 00 00 00 f3 0f 1e fa eb 07 0f 00 2d 63 5d 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 91 fb 01 	mov    0x1fb9144(%rip),%rdi        # 0x1fb914b
   7:	e8 1f 00 00 00       	call   0x2b
   c:	48 2b 05 08 42 9b 00 	sub    0x9b4208(%rip),%rax        # 0x9b421b
  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 63 5d 19 00 	verw   0x195d63(%rip)        # 0x195d8b
  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
[  825.210126][    C1] RSP: 0018:ffa0000000147e00 EFLAGS: 00000282
[  825.210129][    C1] RAX: 0000000000e30dc9 RBX: ff11000001bba380 RCX: ffffffffa38e3c17
[  825.210130][    C1] RDX: ff11000001bba380 RSI: ffffffffa6617342 RDI: ffffffffa607a960
[  825.210131][    C1] RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
[  825.210132][    C1] R10: 0000000000000001 R11: 0000000000000001 R12: 1ff4000000028fc3
[  825.210132][    C1] R13: 0000000000000000 R14: dffffc0000000000 R15: 0000000000000000
[  825.210136][    C1]  ? cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[  825.210141][    C1]  default_idle (./arch/x86/include/asm/paravirt.h:62 arch/x86/kernel/process.c:768)
[  825.210143][    C1]  default_idle_call (kernel/sched/idle.c:122)
[  825.210144][    C1]  cpuidle_idle_call.constprop.0 (kernel/sched/idle.c:199)
[  825.210147][    C1]  ? arch_cpu_idle_exit+0x40/0x40
[  825.210149][    C1]  ? mark_tsc_async_resets (arch/x86/kernel/tsc_sync.c:49)
[  825.210153][    C1]  ? rcu_is_watching (./include/linux/context_tracking.h:128 (discriminator 3) kernel/rcu/tree.c:752 (discriminator 3))
[  825.210156][    C1]  do_idle (kernel/sched/idle.c:355)
[  825.210158][    C1]  cpu_startup_entry (kernel/sched/idle.c:454)
[  825.210161][    C1]  start_secondary (arch/x86/kernel/smpboot.c:312)
[  825.210163][    C1]  ? set_cpu_sibling_map (arch/x86/kernel/smpboot.c:733 (discriminator 4))


Finger prints:
vxlan_fdb_create:vxlan_fdb_update:vxlan_snoop:vxlan_rcv:udp_queue_rcv_one_skb