======================================
| xx__-> [    2.200754] ------------[ cut here ]------------
| [    2.200869] refcount_t: underflow; use-after-free.
| [    2.200948] WARNING: CPU: 1 PID: 252 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [    2.201045] Modules linked in:
[    2.201178] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.201243] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[    2.201301] Code: ae e8 e8 54 ba ff 90 0f 0b 90 90 c3 80 3d 00 e6 2b 01 00 75 89 c6 05 f7 e5 2b 01 01 90 48 c7 c7 f8 48 b5 ae e8 c5 54 ba ff 90 <0f> 0b 90 90 c3 80 3d db e5 2b 01 00 0f 85 62 ff ff ff c6 05 ce e5
All code
========
   0:	ae                   	scas   %es:(%rdi),%al
   1:	e8 e8 54 ba ff       	call   0xffffffffffba54ee
   6:	90                   	nop
   7:	0f 0b                	ud2
   9:	90                   	nop
   a:	90                   	nop
   b:	c3                   	ret
   c:	80 3d 00 e6 2b 01 00 	cmpb   $0x0,0x12be600(%rip)        # 0x12be613
  13:	75 89                	jne    0xffffffffffffff9e
  15:	c6 05 f7 e5 2b 01 01 	movb   $0x1,0x12be5f7(%rip)        # 0x12be613
  1c:	90                   	nop
  1d:	48 c7 c7 f8 48 b5 ae 	mov    $0xffffffffaeb548f8,%rdi
  24:	e8 c5 54 ba ff       	call   0xffffffffffba54ee
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	c3                   	ret
  2f:	80 3d db e5 2b 01 00 	cmpb   $0x0,0x12be5db(%rip)        # 0x12be611
  36:	0f 85 62 ff ff ff    	jne    0xffffffffffffff9e
  3c:	c6                   	.byte 0xc6
  3d:	05                   	.byte 0x5
  3e:	ce                   	(bad)
  3f:	e5                   	.byte 0xe5

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	c3                   	ret
   5:	80 3d db e5 2b 01 00 	cmpb   $0x0,0x12be5db(%rip)        # 0x12be5e7
   c:	0f 85 62 ff ff ff    	jne    0xffffffffffffff74
  12:	c6                   	.byte 0xc6
  13:	05                   	.byte 0x5
  14:	ce                   	(bad)
  15:	e5                   	.byte 0xe5
[    2.201487] RSP: 0018:ffffa3b1405d7868 EFLAGS: 00010286
[    2.201537] RAX: 0000000000000000 RBX: ffffa3b1405d7878 RCX: 00000000ffffdfff
[    2.201615] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.201706] RBP: ffffa3b1405d7370 R08: ffffffffaf35ba28 R09: 00000000ffffdfff
[    2.201789] R10: ffffffffaf27ba40 R11: ffffffffaf32ba40 R12: dead000000000122
[    2.201866] R13: 00000000fffb7431 R14: 0000000000000001 R15: ffff923881e98000
[    2.201945] FS:  00007f972579eb80(0000) GS:ffff92390f211000(0000) knlGS:0000000000000000
[    2.202031] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.202102] CR2: 00007f6897a8db70 CR3: 0000000004716006 CR4: 0000000000772ef0
[    2.202178] PKRU: 55555554
[    2.202202] Call Trace:
[    2.202231]  <TASK>
[    2.202262]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[    2.202311]  rtnl_dellink (net/core/rtnetlink.c:3580)
[    2.202367]  ? idr_alloc_cyclic (lib/idr.c:126)
[    2.202416]  ? ep_poll_callback (fs/eventpoll.c:1329)
[    2.202468]  ? rtnl_bridge_getlink (net/core/rtnetlink.c:3536)
[    2.202527]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[    2.202574]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[    2.202632]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[    2.202685]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[    2.202732]  ? __alloc_skb (net/core/skbuff.c:690)
[    2.202781]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[    2.202828]  __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2244)
[    2.202899]  ? alloc_file_pseudo (./include/linux/fs.h:3233 fs/file_table.c:393)
[    2.202949]  ? sock_alloc_file (./include/linux/fs.h:3233 net/socket.c:499)
[    2.202996]  ? __sys_socket (net/socket.c:516 net/socket.c:1756)
[    2.203042]  __x64_sys_sendto (net/socket.c:2251 net/socket.c:2247 net/socket.c:2247)
[    2.203088]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    2.203135]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    2.203194] RIP: 0033:0x7f97258b1120
[    2.203247] Code: Unable to access opcode bytes at 0x7f97258b10f6.

Code starting with the faulting instruction
===========================================
[    2.203314] RSP: 002b:00007ffe8eca21d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[    2.203400] RAX: ffffffffffffffda RBX: 00007ffe8eca2270 RCX: 00007f97258b1120
[    2.203477] RDX: 0000000000000034 RSI: 00007ffe8eca21e0 RDI: 0000000000000007
[    2.203554] RBP: 0000000000000007 R08: 0000000000000000 R09: 0000000000000000
[    2.203632] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000


Finger prints:
refcount_warn_saturate:netdev_run_todo:rtnl_dellink:rtnetlink_rcv_msg:netlink_rcv_skb