======================================
| [   40.300601] ------------[ cut here ]------------
| [   40.300694] refcount_t: underflow; use-after-free.
| [   40.300767] WARNING: CPU: 0 PID: 1202 at lib/refcount.c:28 refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
| [   40.300863] Modules linked in: dummy sch_ingress bridge stp llc 8021q vrf veth
[   40.301033] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011
[   40.301090] RIP: 0010:refcount_warn_saturate (lib/refcount.c:28 (discriminator 3))
[   40.301142] Code: ae e8 18 df ba ff 90 0f 0b 90 90 c3 80 3d f9 da eb 00 00 75 89 c6 05 f0 da eb 00 01 90 48 c7 c7 28 e0 f1 ae e8 f5 de ba ff 90 <0f> 0b 90 90 c3 80 3d d4 da eb 00 00 0f 85 62 ff ff ff c6 05 c7 da
All code
========
   0:	ae                   	scas   %es:(%rdi),%al
   1:	e8 18 df ba ff       	call   0xffffffffffbadf1e
   6:	90                   	nop
   7:	0f 0b                	ud2
   9:	90                   	nop
   a:	90                   	nop
   b:	c3                   	ret
   c:	80 3d f9 da eb 00 00 	cmpb   $0x0,0xebdaf9(%rip)        # 0xebdb0c
  13:	75 89                	jne    0xffffffffffffff9e
  15:	c6 05 f0 da eb 00 01 	movb   $0x1,0xebdaf0(%rip)        # 0xebdb0c
  1c:	90                   	nop
  1d:	48 c7 c7 28 e0 f1 ae 	mov    $0xffffffffaef1e028,%rdi
  24:	e8 f5 de ba ff       	call   0xffffffffffbadf1e
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	90                   	nop
  2d:	90                   	nop
  2e:	c3                   	ret
  2f:	80 3d d4 da eb 00 00 	cmpb   $0x0,0xebdad4(%rip)        # 0xebdb0a
  36:	0f 85 62 ff ff ff    	jne    0xffffffffffffff9e
  3c:	c6                   	.byte 0xc6
  3d:	05                   	.byte 0x5
  3e:	c7                   	(bad)
  3f:	da                   	.byte 0xda

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	90                   	nop
   3:	90                   	nop
   4:	c3                   	ret
   5:	80 3d d4 da eb 00 00 	cmpb   $0x0,0xebdad4(%rip)        # 0xebdae0
   c:	0f 85 62 ff ff ff    	jne    0xffffffffffffff74
  12:	c6                   	.byte 0xc6
  13:	05                   	.byte 0x5
  14:	c7                   	(bad)
  15:	da                   	.byte 0xda
[   40.301306] RSP: 0018:ffffbd40809ef730 EFLAGS: 00010282
[   40.301358] RAX: 0000000000000000 RBX: ffffbd40809ef740 RCX: 00000000ffffdfff
[   40.301440] RDX: 0000000000000000 RSI: 00000000ffffffea RDI: 0000000000000001
[   40.301507] RBP: ffffbd40809ef248 R08: ffffffffaf356a28 R09: 00000000ffffdfff
[   40.301581] R10: ffffffffaf276a40 R11: ffffffffaf326a40 R12: dead000000000122
[   40.301654] R13: 00000000fffc0902 R14: 0000000000000001 R15: ffff934642d2c000
[   40.301731] FS:  00007f3e0fc8a800(0000) GS:ffff9346cf1d9000(0000) knlGS:0000000000000000
[   40.301805] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   40.301867] CR2: 000055702a0e5d08 CR3: 0000000007b58002 CR4: 0000000000772ef0
[   40.301943] PKRU: 55555554
[   40.301965] Call Trace:
[   40.301989]  <TASK>
[   40.302016]  netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11670)
[   40.302065]  rtnl_dellink (net/core/rtnetlink.c:3580)
[   40.302113]  ? virtio_fs_enqueue_req (fs/fuse/virtio_fs.c:1473)
[   40.302167]  ? netdev_run_todo (./include/linux/list.h:381 net/core/dev.c:11653)
[   40.302207]  ? rtnl_bridge_getlink (net/core/rtnetlink.c:3536)
[   40.302259]  rtnetlink_rcv_msg (net/core/rtnetlink.c:6959)
[   40.302300]  ? get_page_from_freelist (mm/page_alloc.c:1226 mm/page_alloc.c:1848 mm/page_alloc.c:1858 mm/page_alloc.c:3884)
[   40.302352]  ? rtnl_calcit.isra.0 (net/core/rtnetlink.c:6861)
[   40.302405]  netlink_rcv_skb (net/netlink/af_netlink.c:2550)
[   40.302452]  netlink_unicast (net/netlink/af_netlink.c:1319 net/netlink/af_netlink.c:1344)
[   40.302491]  ? __alloc_skb (net/core/skbuff.c:690)
[   40.302534]  netlink_sendmsg (net/netlink/af_netlink.c:1894)
[   40.302578]  ____sys_sendmsg (net/socket.c:727 net/socket.c:742 net/socket.c:2630)
[   40.302624]  ? copy_msghdr_from_user (net/socket.c:2570)
[   40.302677]  ___sys_sendmsg (net/socket.c:2686)
[   40.302718]  ? do_wp_page (./include/linux/mmu_notifier.h:468 mm/memory.c:3786 mm/memory.c:4140)
[   40.302759]  ? ___pte_offset_map (./include/linux/pgtable.h:347 ./include/linux/pgtable.h:635 mm/pgtable-generic.c:288)
[   40.302802]  ? nfulnl_rcv_nl_event (net/netfilter/nfnetlink_log.c:836)
[   40.302858]  ? fsnotify_grab_connector (fs/notify/mark.c:709)
[   40.302910]  ? fsnotify_destroy_marks (fs/notify/mark.c:937)
[   40.302964]  __sys_sendmsg (net/socket.c:2716)
[   40.303006]  do_syscall_64 (arch/x86/entry/syscall_64.c:63 arch/x86/entry/syscall_64.c:94)
[   40.303051]  entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130)
[   40.303104] RIP: 0033:0x7f3e0fe581d7
[   40.303147] 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)
[   40.303308] RSP: 002b:00007ffea240b298 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
[   40.303382] RAX: ffffffffffffffda RBX: 00007ffea240b9c0 RCX: 00007f3e0fe581d7
[   40.303456] RDX: 0000000000000000 RSI: 00007ffea240b300 RDI: 0000000000000005
[   40.303530] RBP: 0000000000000002 R08: 0000000000000003 R09: 0000000000000078
[   40.303603] R10: 00007f3e0fd54f60 R11: 0000000000000246 R12: 0000000000000002


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