======================================
| [    2.735080] ------------[ cut here ]------------
| [    2.735177] refcount_t: underflow; use-after-free.
| [    2.735235] WARNING: CPU: 1 PID: 313 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [    2.735307] Modules linked in:
[    2.735405] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.735453] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[    2.735495] Code: a9 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 55 a9 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:	a9 e8 e8 54 ba       	test   $0xba54e8e8,%eax
   5:	ff 90 0f 0b 90 90    	call   *-0x6f6ff4f1(%rax)
   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 55 a9 	mov    $0xffffffffa95548f8,%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
[    2.735634] RSP: 0018:ffffb4fac0677868 EFLAGS: 00010286
[    2.735675] RAX: 0000000000000000 RBX: ffffb4fac0677878 RCX: 00000000ffffdfff
[    2.735730] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    2.735780] RBP: ffffb4fac0677370 R08: ffffffffa9d5ba28 R09: 00000000ffffdfff
[    2.735841] R10: ffffffffa9c7ba40 R11: ffffffffa9d2ba40 R12: dead000000000122
[    2.735896] R13: 00000000fffb764e R14: 0000000000000001 R15: ffffa03bc1c02000
[    2.735954] FS:  00007f2c1f2a8b80(0000) GS:ffffa03c54811000(0000) knlGS:0000000000000000
[    2.736013] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    2.736075] CR2: 00007f0e32bdfd20 CR3: 00000000046a4005 CR4: 0000000000772ef0
[    2.736135] PKRU: 55555554
[    2.736156] Call Trace:
[    2.736180]  <TASK>
[    2.736201]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[    2.736245]  rtnl_dellink (net/core/rtnetlink.c:3580)
[    2.736288]  ? get_page_from_freelist (mm/page_alloc.c:1226 mm/page_alloc.c:1848 mm/page_alloc.c:1858 mm/page_alloc.c:3884)
[    2.736331]  ? rtnl_bridge_getlink (net/core/rtnetlink.c:3536)
[    2.736371]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[    2.736402]  ? free_percpu (mm/percpu.c:2272 mm/percpu.c:2226)
[    2.736440]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[    2.736479]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[    2.736518]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[    2.736560]  ? __alloc_skb (net/core/skbuff.c:690)
[    2.736595]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[    2.736634]  __sys_sendto (net/socket.c:727 net/socket.c:742 net/socket.c:2244)
[    2.736673]  ? alloc_file_pseudo (./include/linux/fs.h:3233 fs/file_table.c:393)
[    2.736708]  ? sock_alloc_file (./include/linux/fs.h:3233 net/socket.c:499)
[    2.736742]  ? __sys_socket (net/socket.c:516 net/socket.c:1756)
[    2.736773]  __x64_sys_sendto (net/socket.c:2251 net/socket.c:2247 net/socket.c:2247)
[    2.736809]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    2.736853]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    2.736896] RIP: 0033:0x7f2c1f3bb120
[    2.736929] Code: Unable to access opcode bytes at 0x7f2c1f3bb0f6.

Code starting with the faulting instruction
===========================================
[    2.736976] RSP: 002b:00007ffcac1c6b58 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
[    2.737047] RAX: ffffffffffffffda RBX: 0000000000000030 RCX: 00007f2c1f3bb120
[    2.737103] RDX: 0000000000000030 RSI: 00007ffcac1c6b60 RDI: 0000000000000005
[    2.737154] RBP: 00000000004047d0 R08: 0000000000000000 R09: 0000000000000000
[    2.737204] R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000005


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