======================================
| [    2.243754] ------------[ cut here ]------------
| [    2.243824] rcuref - imbalanced put()
| [    2.243826] WARNING: lib/rcuref.c:266 at 0x0, CPU#2: mausezahn/456
| [    2.243934] Modules linked in: act_gact cls_flower sch_ingress vxlan
[    2.244063] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.244120] RIP: 0010:rcuref_put_slowpath (lib/rcuref.c:266 (discriminator 4))
[    2.244177] Code: c0 75 0d c3 81 fe ff ff ff bf 77 0f 85 f6 78 03 31 c0 c3 c7 07 00 00 00 a0 eb f5 48 83 ec 08 48 89 3c 24 48 8d 3d 30 04 4a 01 <67> 48 0f b9 3a 48 8b 14 24 31 c0 c7 02 00 00 00 e0 48 83 c4 08 c3
All code
========
   0:	c0 75 0d c3          	shlb   $0xc3,0xd(%rbp)
   4:	81 fe ff ff ff bf    	cmp    $0xbfffffff,%esi
   a:	77 0f                	ja     0x1b
   c:	85 f6                	test   %esi,%esi
   e:	78 03                	js     0x13
  10:	31 c0                	xor    %eax,%eax
  12:	c3                   	ret
  13:	c7 07 00 00 00 a0    	movl   $0xa0000000,(%rdi)
  19:	eb f5                	jmp    0x10
  1b:	48 83 ec 08          	sub    $0x8,%rsp
  1f:	48 89 3c 24          	mov    %rdi,(%rsp)
  23:	48 8d 3d 30 04 4a 01 	lea    0x14a0430(%rip),%rdi        # 0x14a045a
  2a:*	67 48 0f b9 3a       	ud1    (%edx),%rdi		<-- trapping instruction
  2f:	48 8b 14 24          	mov    (%rsp),%rdx
  33:	31 c0                	xor    %eax,%eax
  35:	c7 02 00 00 00 e0    	movl   $0xe0000000,(%rdx)
  3b:	48 83 c4 08          	add    $0x8,%rsp
  3f:	c3                   	ret

Code starting with the faulting instruction
===========================================
   0:	67 48 0f b9 3a       	ud1    (%edx),%rdi
   5:	48 8b 14 24          	mov    (%rsp),%rdx
   9:	31 c0                	xor    %eax,%eax
   b:	c7 02 00 00 00 e0    	movl   $0xe0000000,(%rdx)
  11:	48 83 c4 08          	add    $0x8,%rsp
  15:	c3                   	ret
[    2.244276] RSP: 0018:ff56988600333768 EFLAGS: 00010292
[    2.244328] RAX: 00000000dfffffff RBX: ff2dc3c146b37b40 RCX: ff2dc3c146b37b40
[    2.244388] RDX: ff2dc3c146b37ba8 RSI: 00000000dfffffff RDI: ffffffff8c27e6f0
[    2.244449] RBP: ff569886003337d8 R08: ff2dc3c144cbdc00 R09: 0000000000000001
[    2.244510] R10: ff2dc3c141b01540 R11: 0000000000000000 R12: ff56988600333858
[    2.244570] R13: ff2dc3c1418f9e00 R14: 00000000010200c0 R15: 0000000080000000
[    2.244642] FS:  00007fbc507f0c40(0000) GS:ff2dc3c1f24cc000(0000) knlGS:0000000000000000
[    2.244715] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.244770] CR2: 00007ffdaac8eac8 CR3: 0000000006772002 CR4: 0000000000771ef0
[    2.244841] PKRU: 55555554
[    2.244884] Call Trace:
[    2.244927]  <TASK>
[    2.244970]  dst_release (./arch/x86/include/asm/preempt.h:95 (discriminator 1) ./include/linux/rcuref.h:174 (discriminator 1) net/core/dst.c:167 (discriminator 1))
[    2.245020]  rt_cache_route (net/ipv4/route.c:1518)
[    2.245071]  ? dst_alloc (./include/net/dst_ops.h:59 net/core/dst.c:75 net/core/dst.c:93)
[    2.245120]  rt_set_nexthop.isra.0 (net/ipv4/route.c:1622 (discriminator 1))
[    2.245173]  ? rt_dst_alloc (net/ipv4/route.c:1654)
[    2.245221]  ip_route_output_key_hash_rcu (./include/net/lwtunnel.h:140 net/ipv4/route.c:2682 net/ipv4/route.c:2875)
[    2.245275]  ip_route_output_flow (net/ipv4/route.c:2705 ./include/net/route.h:169 net/ipv4/route.c:2932)
[    2.245328]  udp_tunnel_dst_lookup (net/ipv4/udp_tunnel_core.c:261 (discriminator 1))
[    2.245382] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2472 (discriminator 4)) vxlan
[    2.245438]  ? __fuse_simple_request (fs/fuse/dev.c:702)
[    2.245493]  ? vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2829) vxlan
[    2.245547] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2829) vxlan
[    2.245607]  ? filemap_get_read_batch (mm/filemap.c:2477)
[    2.245662]  ? get_page_from_freelist (mm/page_alloc.c:1226 (discriminator 1) mm/page_alloc.c:1843 (discriminator 1) mm/page_alloc.c:1853 (discriminator 1) mm/page_alloc.c:3879 (discriminator 1))
[    2.245726]  ? dev_hard_start_xmit (./include/linux/netdevice.h:5272 ./include/linux/netdevice.h:5281 net/core/dev.c:3853 net/core/dev.c:3869)
[    2.245783]  dev_hard_start_xmit (./include/linux/netdevice.h:5272 ./include/linux/netdevice.h:5281 net/core/dev.c:3853 net/core/dev.c:3869)
[    2.245835]  __dev_queue_xmit (net/core/dev.c:4817)
[    2.245884]  ? __alloc_skb (net/core/skbuff.c:706)
[    2.245933]  ? alloc_skb_with_frags (./include/linux/skbuff.h:1383 net/core/skbuff.c:6715)
[    2.245986]  packet_sendmsg (net/packet/af_packet.c:3076 (discriminator 1) net/packet/af_packet.c:3108 (discriminator 1))
[    2.246037]  ? account_locked_vm (./include/linux/mmap_lock.h:355 mm/util.c:559 mm/util.c:549)
[    2.246087]  __sys_sendto (net/socket.c:721 (discriminator 1) net/socket.c:733 (discriminator 1) net/socket.c:2222 (discriminator 1))
[    2.246137]  __x64_sys_sendto (net/socket.c:2229 (discriminator 1) net/socket.c:2225 (discriminator 1) net/socket.c:2225 (discriminator 1))
[    2.246185]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[    2.246235]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)
[    2.246289] RIP: 0033:0x7fbc509a3c5e
[    2.246336] Code: 4d 89 d8 e8 14 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 13 ff ff ff 0f 1f 00 f3 0f 1e fa
All code
========
   0:	4d 89 d8             	mov    %r11,%r8
   3:	e8 14 bd 00 00       	call   0xbd1c
   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 13 ff ff ff       	call   0xffffffffffffff4c
  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 13 ff ff ff       	call   0xffffffffffffff22
   f:	0f 1f 00             	nopl   (%rax)
  12:	f3 0f 1e fa          	endbr64
[    2.246434] RSP: 002b:00007ffdaac949d0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[    2.246496] RAX: ffffffffffffffda RBX: 00005586ffa55830 RCX: 00007fbc509a3c5e
[    2.246556] RDX: 0000000000000064 RSI: 00005586ffa55ac2 RDI: 0000000000000005
[    2.246623] RBP: 00007ffdaac949e0 R08: 00007ffdaac94a30 R09: 0000000000000014
[    2.246692] R10: 0000000000000000 R11: 0000000000000202 R12: 00005586ffa55ac2


Finger prints:
rcuref_put_slowpath:dst_release:rt_cache_route:ip_route_output_key_hash_rcu:ip_route_output_flow