======================================
| xx__-> [    2.338111] ------------[ cut here ]------------
| [    2.338233] refcount_t: underflow; use-after-free.
| [    2.338317] WARNING: CPU: 0 PID: 12 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [    2.338400] Modules linked in: nf_conntrack_netlink nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4
[    2.338583] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    2.338638] Workqueue: netns cleanup_net
[    2.338681] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[    2.338727] Code: b7 e8 18 ed b9 ff 90 0f 0b 90 90 c3 80 3d d9 ea ea 00 00 75 89 c6 05 d0 ea ea 00 01 90 48 c7 c7 78 de b1 b7 e8 f5 ec b9 ff 90 <0f> 0b 90 90 c3 80 3d b4 ea ea 00 00 0f 85 62 ff ff ff c6 05 a7 ea
All code
========
   0:	b7 e8                	mov    $0xe8,%bh
   2:	18 ed                	sbb    %ch,%ch
   4:	b9 ff 90 0f 0b       	mov    $0xb0f90ff,%ecx
   9:	90                   	nop
   a:	90                   	nop
   b:	c3                   	ret
   c:	80 3d d9 ea ea 00 00 	cmpb   $0x0,0xeaead9(%rip)        # 0xeaeaec
  13:	75 89                	jne    0xffffffffffffff9e
  15:	c6 05 d0 ea ea 00 01 	movb   $0x1,0xeaead0(%rip)        # 0xeaeaec
  1c:	90                   	nop
  1d:	48 c7 c7 78 de b1 b7 	mov    $0xffffffffb7b1de78,%rdi
  24:	e8 f5 ec b9 ff       	call   0xffffffffffb9ed1e
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	c3                   	ret
  2f:	80 3d b4 ea ea 00 00 	cmpb   $0x0,0xeaeab4(%rip)        # 0xeaeaea
  36:	0f 85 62 ff ff ff    	jne    0xffffffffffffff9e
  3c:	c6                   	.byte 0xc6
  3d:	05                   	.byte 0x5
  3e:	a7                   	cmpsl  %es:(%rdi),%ds:(%rsi)
  3f:	ea                   	(bad)

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	c3                   	ret
   5:	80 3d b4 ea ea 00 00 	cmpb   $0x0,0xeaeab4(%rip)        # 0xeaeac0
   c:	0f 85 62 ff ff ff    	jne    0xffffffffffffff74
  12:	c6                   	.byte 0xc6
  13:	05                   	.byte 0x5
  14:	a7                   	cmpsl  %es:(%rdi),%ds:(%rsi)
  15:	ea                   	(bad)
[    2.338902] RSP: 0018:ffffb22680067d50 EFLAGS: 00010286
[    2.338952] RAX: 0000000000000000 RBX: ffffb22680067d60 RCX: 00000000ffffdfff
[    2.339017] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001


Finger prints: