======================================
| [    7.695175] ------------[ cut here ]------------
| [    7.695346] refcount_t: underflow; use-after-free.
| [    7.695446] WARNING: CPU: 2 PID: 293 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [    7.695541] Modules linked in:
[    7.695706] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[    7.695775] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[    7.695840] Code: 89 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 94 89 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:	89 e8                	mov    %ebp,%eax
   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:	94                   	xchg   %eax,%esp
  23:	89 e8                	mov    %ebp,%eax
  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
[    7.695983] RSP: 0018:ffffb2f04074f730 EFLAGS: 00010282
[    7.696061] RAX: 0000000000000000 RBX: ffffb2f04074f740 RCX: 00000000ffffdfff
[    7.696140] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[    7.696223] RBP: ffffb2f04074f258 R08: ffffffff89d56a28 R09: 00000000ffffdfff
[    7.696366] R10: ffffffff89c76a40 R11: ffffffff89d26a40 R12: dead000000000122
[    7.696456] R13: 00000000fffb89ac R14: 0000000000000001 R15: ffff9ec086f7b000
[    7.696570] FS:  00007fb632f34800(0000) GS:ffff9ec1348b7000(0000) knlGS:0000000000000000
[    7.696672] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    7.696766] CR2: 00000000004e5840 CR3: 0000000002ec0006 CR4: 0000000000772ef0
[    7.696869] PKRU: 55555554
[    7.696920] Call Trace:
[    7.696973]  <TASK>
[    7.697019]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[    7.697090]  rtnl_dellink (net/core/rtnetlink.c:3580)
[    7.697164]  ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1473)
[    7.697247]  ? netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11653)
[    7.697316]  ? rtnl_bridge_getlink (net/core/rtnetlink.c:3536)
[    7.697396]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[    7.697464]  ? get_page_from_freelist (mm/page_alloc.c:1226 mm/page_alloc.c:1848 mm/page_alloc.c:1858 mm/page_alloc.c:3884)
[    7.697562]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[    7.697625]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[    7.697695]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[    7.697753]  ? __alloc_skb (net/core/skbuff.c:690)
[    7.697812]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[    7.697903]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[    7.697974]  ? copy_msghdr_from_user (net/socket.c:2570)
[    7.698065]  ___sys_sendmsg (net/socket.c:2686)
[    7.698131]  ? do_wp_page (./include/linux/mmu_notifier.h:468 mm/memory.c:3786 mm/memory.c:4140)
[    7.698202]  ? ___pte_offset_map (./include/linux/pgtable.h:347 ./include/linux/pgtable.h:635 mm/pgtable-generic.c:288)
[    7.698270]  ? __handle_mm_fault (mm/memory.c:6193 mm/memory.c:6318)
[    7.698348]  ? fsnotify_grab_connector (fs/notify/mark.c:709)
[    7.698426]  ? fsnotify_destroy_marks (fs/notify/mark.c:937)
[    7.698517]  __sys_sendmsg (net/socket.c:2716)
[    7.698586]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[    7.698674]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[    7.698750] RIP: 0033:0x7fb6331021d7
[    7.698820] 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)
[    7.699012] RSP: 002b:00007fffcf36dd58 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[    7.699119] RAX: ffffffffffffffda RBX: 00007fffcf36e490 RCX: 00007fb6331021d7
[    7.699219] RDX: 0000000000000000 RSI: 00007fffcf36ddc0 RDI: 0000000000000005
[    7.699319] RBP: 0000000000000001 R08: 0000000000000003 R09: 0000000000000078
[    7.699416] R10: 00007fb632ffe510 R11: 0000000000000246 R12: 0000000000000001


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