======================================
| [    1.516029] ------------[ cut here ]------------
| [    1.516070] rcuref - imbalanced put()
| [    1.516071] WARNING: lib/rcuref.c:266 at 0x0, CPU#3: mausezahn/263
| [    1.516127] Modules linked in: act_gact cls_flower sch_ingress vxlan
[    1.516212] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    1.516248] RIP: 0010:rcuref_put_slowpath (lib/rcuref.c:266 (discriminator 4))
[    1.516282] 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
[    1.516382] RSP: 0018:ff41b73600293768 EFLAGS: 00010292
[    1.516412] RAX: 00000000dfffffff RBX: ff1441b2c33d80c0 RCX: ff1441b2c33d80c0
[    1.516451] RDX: ff1441b2c33d8128 RSI: 00000000dfffffff RDI: ffffffffbce7e6f0
[    1.516491] RBP: ff41b736002937d8 R08: ff1441b2c3325e00 R09: 0000000000000001
[    1.516529] R10: ff1441b2c6b32480 R11: 0000000000000000 R12: ff41b73600293858
[    1.516567] R13: ff1441b2c18f9c00 R14: 00000000010200c0 R15: 0000000080000000
[    1.516609] FS:  00007f6dbbc88c40(0000) GS:ff1441b34194c000(0000) knlGS:0000000000000000
[    1.516655] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.516688] CR2: 00007ffcb4f65fc8 CR3: 0000000004d39002 CR4: 0000000000771ef0
[    1.516738] PKRU: 55555554
[    1.516752] Call Trace:
[    1.516771]  <TASK>
[    1.516785]  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))
[    1.516814]  rt_cache_route (net/ipv4/route.c:1518)
[    1.516837]  ? dst_alloc (./include/net/dst_ops.h:59 net/core/dst.c:75 net/core/dst.c:93)
[    1.516861]  rt_set_nexthop.isra.0 (net/ipv4/route.c:1622 (discriminator 1))
[    1.516899]  ? rt_dst_alloc (net/ipv4/route.c:1654)
[    1.516922]  ip_route_output_key_hash_rcu (./include/net/lwtunnel.h:140 net/ipv4/route.c:2682 net/ipv4/route.c:2875)
[    1.516953]  ip_route_output_flow (net/ipv4/route.c:2705 ./include/net/route.h:169 net/ipv4/route.c:2932)
[    1.516979]  udp_tunnel_dst_lookup (net/ipv4/udp_tunnel_core.c:261 (discriminator 1))
[    1.517010] vxlan_xmit_one (drivers/net/vxlan/vxlan_core.c:2472 (discriminator 4)) vxlan
[    1.517042]  ? __fuse_simple_request (fs/fuse/dev.c:702)
[    1.517076]  ? vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2829) vxlan
[    1.517104] vxlan_xmit (drivers/net/vxlan/vxlan_core.c:2829) vxlan
[    1.517134]  ? filemap_get_read_batch (mm/filemap.c:2477)
[    1.517164]  ? 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))
[    1.517193]  ? dev_hard_start_xmit (./include/linux/netdevice.h:5272 ./include/linux/netdevice.h:5281 net/core/dev.c:3853 net/core/dev.c:3869)
[    1.517227]  dev_hard_start_xmit (./include/linux/netdevice.h:5272 ./include/linux/netdevice.h:5281 net/core/dev.c:3853 net/core/dev.c:3869)
[    1.517249]  __dev_queue_xmit (net/core/dev.c:4817)
[    1.517270]  ? __alloc_skb (net/core/skbuff.c:706)
[    1.517294]  ? alloc_skb_with_frags (./include/linux/skbuff.h:1383 net/core/skbuff.c:6715)
[    1.517318]  packet_sendmsg (net/packet/af_packet.c:3076 (discriminator 1) net/packet/af_packet.c:3108 (discriminator 1))
[    1.517343]  ? account_locked_vm (./include/linux/mmap_lock.h:355 mm/util.c:559 mm/util.c:549)
[    1.517367]  __sys_sendto (net/socket.c:721 (discriminator 1) net/socket.c:733 (discriminator 1) net/socket.c:2222 (discriminator 1))
[    1.517391]  __x64_sys_sendto (net/socket.c:2229 (discriminator 1) net/socket.c:2225 (discriminator 1) net/socket.c:2225 (discriminator 1))
[    1.517411]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 (discriminator 1) arch/x86/entry/syscall_64.c:94 (discriminator 1))
[    1.517437]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:131)
[    1.517473] RIP: 0033:0x7f6dbbe3bc5e
[    1.517505] 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
[    1.517596] RSP: 002b:00007ffcb4f6bed0 EFLAGS: 00000202 ORIG_RAX: 000000000000002c
[    1.517639] RAX: ffffffffffffffda RBX: 000055c730be6830 RCX: 00007f6dbbe3bc5e
[    1.517689] RDX: 0000000000000064 RSI: 000055c730be6ac2 RDI: 0000000000000005
[    1.517726] RBP: 00007ffcb4f6bee0 R08: 00007ffcb4f6bf30 R09: 0000000000000014
[    1.517764] R10: 0000000000000000 R11: 0000000000000202 R12: 000055c730be6ac2


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