======================================
| [ 2100.306427][T18197] 1 lock held by arping/18197:
| [ 2100.306615][T18197]  #0: ffffffffa9591d60 (rcu_read_lock_bh){....}-{1:3}, at: __dev_queue_xmit (./include/linux/bottom_half.h:20 (discriminator 2) ./include/linux/rcupdate.h:893 (discriminator 2) net/core/dev.c:4796 (discriminator 2))
| [ 2100.306879][T18197]
| [ 2100.306879][T18197] stack backtrace:
[ 2100.307078][T18197] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[ 2100.307081][T18197] Call Trace:
[ 2100.307083][T18197]  <TASK>
[ 2100.307085][T18197]  dump_stack_lvl (lib/dump_stack.c:94 lib/dump_stack.c:120)
[ 2100.307092][T18197]  lockdep_rcu_suspicious.cold (kernel/locking/lockdep.c:6876)
[ 2100.307097][T18197] arp_reduce.isra.0 (drivers/net/vxlan/vxlan_core.c:1872 (discriminator 11)) vxlan
[ 2100.307105][T18197]  ? mark_usage (kernel/locking/lockdep.c:4674)
[ 2100.307110][T18197]  ? __lock_acquire (kernel/locking/lockdep.c:5237)
[ 2100.307114][T18197]  ? vxlan_nl2conf (drivers/net/vxlan/vxlan_core.c:4326 (discriminator 2)) vxlan
[ 2100.307119][T18197]  ? lock_acquire.part.0 (kernel/locking/lockdep.c:5868 (discriminator 1))
[ 2100.307121][T18197]  ? find_held_lock (kernel/locking/lockdep.c:5350)
[ 2100.307125][T18197]  ? __lock_release.isra.0 (kernel/locking/lockdep.c:5535)
[ 2100.307128][T18197]  ? vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2801) vxlan
[ 2100.307133][T18197] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2801) vxlan
[ 2100.307138][T18197]  ? rcu_lockdep_current_cpu_online (kernel/rcu/tree.c:4069 (discriminator 3) kernel/rcu/tree.c:4061 (discriminator 3))
[ 2100.307143][T18197]  dev_hard_start_xmit (./include/linux/netdevice.h:5403 ./include/linux/netdevice.h:5412 net/core/dev.c:3892 net/core/dev.c:3908)
[ 2100.307146][T18197]  ? validate_xmit_skb (net/core/dev.c:4032)
[ 2100.307149][T18197]  __dev_queue_xmit (net/core/dev.c:4875)
[ 2100.307151][T18197]  ? _copy_from_iter (./include/linux/instrumented.h:146 lib/iov_iter.c:66 ./include/linux/iov_iter.h:30 ./include/linux/iov_iter.h:302 ./include/linux/iov_iter.h:330 lib/iov_iter.c:261 lib/iov_iter.c:272)
[ 2100.307155][T18197]  ? __alloc_skb (./include/linux/instrumented.h:97 ./include/linux/atomic/atomic-instrumented.h:67 net/core/skbuff.c:410 net/core/skbuff.c:722)
[ 2100.307159][T18197]  ? _copy_from_iter_flushcache (./include/linux/iov_iter.h:112)
[ 2100.307161][T18197]  ? ref_tracker_alloc (./include/linux/instrumented.h:112 ./include/linux/atomic/atomic-instrumented.h:252 ./include/linux/refcount.h:283 ./include/linux/refcount.h:366 ./include/linux/refcount.h:383 lib/ref_tracker.c:265)
[ 2100.307164][T18197]  ? netdev_core_pick_tx (net/core/dev.c:4736)
[ 2100.307168][T18197]  ? packet_parse_headers (./include/linux/skbuff.h:1625 ./include/linux/skbuff.h:3196 net/packet/af_packet.c:1939)
[ 2100.307171][T18197]  ? __asan_memset (mm/kasan/shadow.c:84 (discriminator 1))
[ 2100.307174][T18197]  ? packet_parse_headers (./include/linux/skbuff.h:1625 ./include/linux/skbuff.h:3196 net/packet/af_packet.c:1939)
[ 2100.307177][T18197]  ? skb_copy_datagram_from_iter (./include/linux/uio.h:228 net/core/datagram.c:561)
[ 2100.307180][T18197]  ? packet_release (net/packet/af_packet.c:3171)
[ 2100.307184][T18197]  packet_snd (net/packet/af_packet.c:3082)
[ 2100.307189][T18197]  ? tpacket_snd (net/packet/af_packet.c:2685)
[ 2100.307191][T18197]  ? __might_fault (mm/memory.c:7292 (discriminator 5))
[ 2100.307197][T18197]  ? __might_fault (mm/memory.c:7292 (discriminator 5))
[ 2100.307199][T18197]  ? __might_fault (mm/memory.c:7292 (discriminator 5))
[ 2100.307203][T18197]  __sys_sendto (net/socket.c:775 (discriminator 4) net/socket.c:790 (discriminator 4) net/socket.c:2252 (discriminator 4))
[ 2100.307206][T18197]  ? __ia32_sys_getpeername (net/socket.c:2206)
[ 2100.307214][T18197]  ? do_user_addr_fault (./include/linux/mmap_lock.h:619 arch/x86/mm/fault.c:1422)
[ 2100.307220][T18197]  __x64_sys_sendto (net/socket.c:2259 net/socket.c:2255 net/socket.c:2255)
[ 2100.307222][T18197]  ? trace_irq_enable.constprop.0 (./include/trace/events/preemptirq.h:40 (discriminator 22))
[ 2100.307225][T18197]  ? lockdep_hardirqs_on (kernel/locking/lockdep.c:4472)
[ 2100.307228][T18197]  ? do_syscall_64 (./include/linux/entry-common.h:177 arch/x86/entry/syscall_64.c:89)
[ 2100.307230][T18197]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[ 2100.307232][T18197]  ? trace_hardirqs_off (kernel/trace/trace_preemptirq.c:104 (discriminator 1))
[ 2100.307234][T18197]  ? exc_page_fault (arch/x86/mm/fault.c:1489 (discriminator 3) arch/x86/mm/fault.c:1536 (discriminator 3))
[ 2100.307236][T18197]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)
[ 2100.307238][T18197] RIP: 0033:0x7f21a5faf54e
[ 2100.307242][T18197] Code: 4d 89 d8 e8 b4 bd 00 00 4c 8b 5d f8 41 8b 93 08 03 00 00 59 5e 48 83 f8 fc 74 11 c9 c3 0f 1f 80 00 00 00 00 48 8b 45 10 0f 05 <c9> c3 83 e2 39 83 fa 08 75 e7 e8 03 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 b4 bd 00 00       	call   0xbdbc
   8:	4c 8b 5d f8          	mov    -0x8(%rbp),%r11
   c:	41 8b 93 08 03 00 00 	mov    0x308(%r11),%edx
  13:	59                   	pop    %rcx
  14:	5e                   	pop    %rsi
  15:	48 83 f8 fc          	cmp    $0xfffffffffffffffc,%rax
  19:	74 11                	je     0x2c
  1b:	c9                   	leave
  1c:	c3                   	ret
  1d:	0f 1f 80 00 00 00 00 	nopl   0x0(%rax)
  24:	48 8b 45 10          	mov    0x10(%rbp),%rax
  28:	0f 05                	syscall
  2a:*	c9                   	leave		<-- trapping instruction
  2b:	c3                   	ret
  2c:	83 e2 39             	and    $0x39,%edx
  2f:	83 fa 08             	cmp    $0x8,%edx
  32:	75 e7                	jne    0x1b
  34:	e8 03 ff ff ff       	call   0xffffffffffffff3c
  39:	0f 1f 00             	nopl   (%rax)
  3c:	f3 0f 1e fa          	endbr64

Code starting with the faulting instruction
===========================================
   0:	c9                   	leave
   1:	c3                   	ret
   2:	83 e2 39             	and    $0x39,%edx
   5:	83 fa 08             	cmp    $0x8,%edx
   8:	75 e7                	jne    0xfffffffffffffff1
   a:	e8 03 ff ff ff       	call   0xffffffffffffff12
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[ 2100.307244][T18197] RSP: 002b:00007fff3343dcc0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[ 2100.307247][T18197] RAX: ffffffffffffffda RBX: 000000000000001c RCX: 00007f21a5faf54e
[ 2100.307248][T18197] RDX: 000000000000001c RSI: 00007fff3343dd40 RDI: 0000000000000005
[ 2100.307249][T18197] RBP: 00007fff3343dcd0 R08: 00007fff3343e1c0 R09: 0000000000000014
[ 2100.307250][T18197] R10: 0000000000000000 R11: 0000000000000202 R12: 0000000000000000


Finger prints:
vxlan_xmit:dev_hard_start_xmit:__dev_queue_xmit:packet_snd:__sys_sendto