======================================
| [    1.961293] ------------[ cut here ]------------
| [    1.961385] refcount_t: underflow; use-after-free.
| [    1.961460] WARNING: CPU: 3 PID: 265 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [    1.961561] Modules linked in:
[    1.961712] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    1.961780] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[    1.961841] Code: 84 e8 88 98 ba ff 90 0f 0b 90 90 c3 80 3d 69 b4 eb 00 00 75 89 c6 05 60 b4 eb 00 01 90 48 c7 c7 98 6e 54 84 e8 65 98 ba ff 90 <0f> 0b 90 90 c3 80 3d 44 b4 eb 00 00 0f 85 62 ff ff ff c6 05 37 b4
All code
========
   0:	84 e8                	test   %ch,%al
   2:	88 98 ba ff 90 0f    	mov    %bl,0xf90ffba(%rax)
   8:	0b 90 90 c3 80 3d    	or     0x3d80c390(%rax),%edx
   e:	69 b4 eb 00 00 75 89 	imul   $0xb46005c6,-0x768b0000(%rbx,%rbp,8),%esi
  15:	c6 05 60 b4 
  19:	eb 00                	jmp    0x1b
  1b:	01 90 48 c7 c7 98    	add    %edx,-0x673838b8(%rax)
  21:	6e                   	outsb  %ds:(%rsi),(%dx)
  22:	54                   	push   %rsp
  23:	84 e8                	test   %ch,%al
  25:	65 98                	gs cwtl
  27:*	ba ff 90 0f 0b       	mov    $0xb0f90ff,%edx		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	c3                   	ret
  2f:	80 3d 44 b4 eb 00 00 	cmpb   $0x0,0xebb444(%rip)        # 0xebb47a
  36:	0f 85 62 ff ff ff    	jne    0xffffffffffffff9e
  3c:	c6                   	.byte 0xc6
  3d:	05                   	.byte 0x5
  3e:	37                   	(bad)
  3f:	b4                   	.byte 0xb4

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	c3                   	ret
   5:	80 3d 44 b4 eb 00 00 	cmpb   $0x0,0xebb444(%rip)        # 0xebb450
   c:	0f 85 62 ff ff ff    	jne    0xffffffffffffff74
  12:	c6                   	.byte 0xc6
  13:	05                   	.byte 0x5
  14:	37                   	(bad)
  15:	b4                   	.byte 0xb4
[    1.962035] RSP: 0018:ffffaebf0064f730 EFLAGS: 00010282
[    1.962089] RAX: 0000000000000000 RBX: ffffaebf0064f740 RCX: 00000000ffffdfff
[    1.962174] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    1.962268] RBP: ffffaebf0064f258 R08: ffffffff84956a28 R09: 00000000ffffdfff
[    1.962362] R10: ffffffff84876a40 R11: ffffffff84926a40 R12: dead000000000122
[    1.962448] R13: 00000000fffb7347 R14: 0000000000000001 R15: ffff8f6d42cab000
[    1.962536] FS:  00007f95442b7800(0000) GS:ffff8f6df9d37000(0000) knlGS:0000000000000000
[    1.962623] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    1.962693] CR2: 00007f3efc3f64c0 CR3: 0000000004e48001 CR4: 0000000000772ef0
[    1.962782] PKRU: 55555554
[    1.962809] Call Trace:
[    1.962840]  <TASK>
[    1.962867]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[    1.962920]  rtnl_dellink (net/core/rtnetlink.c:3580)
[    1.962992]  ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1473)
[    1.963060]  ? netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11653)
[    1.963099]  ? rtnl_bridge_getlink (net/core/rtnetlink.c:3536)
[    1.963157]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[    1.963198]  ? get_page_from_freelist (mm/page_alloc.c:1226 mm/page_alloc.c:1848 mm/page_alloc.c:1858 mm/page_alloc.c:3884)
[    1.963274]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[    1.963334]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[    1.963377]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[    1.963418]  ? __alloc_skb (net/core/skbuff.c:690)
[    1.963460]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[    1.963502]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[    1.963549]  ? copy_msghdr_from_user (net/socket.c:2570)
[    1.963605]  ___sys_sendmsg (net/socket.c:2686)
[    1.963647]  ? do_wp_page (./include/linux/mmu_notifier.h:468 mm/memory.c:3786 mm/memory.c:4140)
[    1.963696]  ? ___pte_offset_map (./include/linux/pgtable.h:347 ./include/linux/pgtable.h:635 mm/pgtable-generic.c:288)
[    1.963745]  ? __handle_mm_fault (mm/memory.c:6193 mm/memory.c:6318)
[    1.963801]  ? fsnotify_grab_connector (fs/notify/mark.c:709)
[    1.963858]  ? fsnotify_destroy_marks (fs/notify/mark.c:937)
[    1.963915]  __sys_sendmsg (net/socket.c:2716)
[    1.963966]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    1.964009]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    1.964063] RIP: 0033:0x7f95444851d7
[    1.964111] Code: 0e 00 f7 d8 64 89 02 48 c7 c0 ff ff ff ff eb b9 0f 1f 00 f3 0f 1e fa 64 8b 04 25 18 00 00 00 85 c0 75 10 b8 2e 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 51 c3 48 83 ec 28 89 54 24 1c 48 89 74 24 10
All code
========
   0:	0e                   	(bad)
   1:	00 f7                	add    %dh,%bh
   3:	d8 64 89 02          	fsubs  0x2(%rcx,%rcx,4)
   7:	48 c7 c0 ff ff ff ff 	mov    $0xffffffffffffffff,%rax
   e:	eb b9                	jmp    0xffffffffffffffc9
  10:	0f 1f 00             	nopl   (%rax)
  13:	f3 0f 1e fa          	endbr64
  17:	64 8b 04 25 18 00 00 	mov    %fs:0x18,%eax
  1e:	00 
  1f:	85 c0                	test   %eax,%eax
  21:	75 10                	jne    0x33
  23:	b8 2e 00 00 00       	mov    $0x2e,%eax
  28:	0f 05                	syscall
  2a:*	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax		<-- trapping instruction
  30:	77 51                	ja     0x83
  32:	c3                   	ret
  33:	48 83 ec 28          	sub    $0x28,%rsp
  37:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  3b:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)

Code starting with the faulting instruction
===========================================
   0:	48 3d 00 f0 ff ff    	cmp    $0xfffffffffffff000,%rax
   6:	77 51                	ja     0x59
   8:	c3                   	ret
   9:	48 83 ec 28          	sub    $0x28,%rsp
   d:	89 54 24 1c          	mov    %edx,0x1c(%rsp)
  11:	48 89 74 24 10       	mov    %rsi,0x10(%rsp)
[    1.964303] RSP: 002b:00007fff09f1ab18 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[    1.964389] RAX: ffffffffffffffda RBX: 00007fff09f1b240 RCX: 00007f95444851d7
[    1.964473] RDX: 0000000000000000 RSI: 00007fff09f1ab80 RDI: 0000000000000005
[    1.964554] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[    1.964633] R10: 00007f9544381f60 R11: 0000000000000246 R12: 0000000000000001


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