======================================
| [    2.065422] ip (260) used greatest stack depth: 12344 bytes left
| [    5.133863] ------------[ cut here ]------------
| [    5.133913] kernel BUG at net/core/skbuff.c:2813!
| [    5.133950] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[    5.134025] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[    5.134098] Workqueue: events mptcp_worker
[    5.134128] RIP: 0010:__pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 5.134158] Code: 44 24 10 e8 ed 38 83 ff 49 8b be c0 00 00 00 44 8b 44 24 10 41 8b 8e bc 00 00 00 e9 f4 fc ff ff 4c 8d 48 ff e9 41 fd ff ff 90 <0f> 0b 48 c7 44 24 10 00 00 00 00 e9 99 fe ff ff 41 f6 44 24 7e 20
All code
========
   0:	44 24 10             	rex.R and $0x10,%al
   3:	e8 ed 38 83 ff       	call   0xffffffffff8338f5
   8:	49 8b be c0 00 00 00 	mov    0xc0(%r14),%rdi
   f:	44 8b 44 24 10       	mov    0x10(%rsp),%r8d
  14:	41 8b 8e bc 00 00 00 	mov    0xbc(%r14),%ecx
  1b:	e9 f4 fc ff ff       	jmp    0xfffffffffffffd14
  20:	4c 8d 48 ff          	lea    -0x1(%rax),%r9
  24:	e9 41 fd ff ff       	jmp    0xfffffffffffffd6a
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	48 c7 44 24 10 00 00 	movq   $0x0,0x10(%rsp)
  33:	00 00 
  35:	e9 99 fe ff ff       	jmp    0xfffffffffffffed3
  3a:	41 f6 44 24 7e 20    	testb  $0x20,0x7e(%r12)

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	48 c7 44 24 10 00 00 	movq   $0x0,0x10(%rsp)
   9:	00 00 
   b:	e9 99 fe ff ff       	jmp    0xfffffffffffffea9
  10:	41 f6 44 24 7e 20    	testb  $0x20,0x7e(%r12)
[    5.134253] RSP: 0018:ffffb3bc400e8dc8 EFLAGS: 00010282
[    5.134284] RAX: 00000000fffffff2 RBX: 0000000000000014 RCX: 0000000000000014
[    5.134335] RDX: ffff8b49c1c05fbc RSI: 0000000000000100 RDI: 0000000000000000
[    5.134384] RBP: ffffb3bc400e8e08 R08: 00000000ffffffd0 R09: 0000000000000008
[    5.134428] R10: ffff8b49c20fb0c8 R11: 0000000000000018 R12: ffff8b49c20fb000
[    5.134472] R13: 0000000000000014 R14: ffff8b49c1cb5e00 R15: 0000000000000002
[    5.134519] FS:  0000000000000000(0000) GS:ffff8b49fec80000(0000) knlGS:0000000000000000
[    5.134565] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    5.134601] CR2: 00007ffce97cbf44 CR3: 000000000235c006 CR4: 0000000000770ef0
[    5.134649] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    5.134706] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    5.134745] PKRU: 55555554
[    5.134764] Call Trace:
[    5.134781]  <IRQ>
[    5.134800] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[    5.134828] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[    5.134852] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    5.134877] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[    5.134901] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    5.134926] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[    5.134951] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    5.134970] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[    5.134997] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    5.135024] ? __pskb_pull_tail (net/core/skbuff.c:2813) 
[    5.135054] tcp_v4_early_demux (./include/linux/skbuff.h:2731 ./include/linux/skbuff.h:2739 net/ipv4/tcp_ipv4.c:1966) 
[    5.135081] ip_rcv_finish_core.constprop.0 (./include/linux/skbuff.h:1139 ./include/net/dst_metadata.h:94 net/ipv4/ip_input.c:364) 
[    5.135115] ip_rcv (net/ipv4/ip_input.c:448 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:569) 
[    5.135138] ? ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 1)) 
[    5.135169] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[    5.135202] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) 
[    5.135226] __napi_poll (net/core/dev.c:6703) 
[    5.135252] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) 
[    5.135275] __do_softirq (kernel/softirq.c:553) 
[    5.135303] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[    5.135333]  </IRQ>
[    5.135351]  <TASK>
[    5.135364] __local_bh_enable_ip (kernel/softirq.c:381) 
[    5.135388] __dev_queue_xmit (net/core/dev.c:4400) 
[    5.135413] ip_finish_output2 (./include/linux/netdevice.h:3172 ./include/net/neighbour.h:526 ./include/net/neighbour.h:540 net/ipv4/ip_output.c:235) 
[    5.135439] ? __ip_finish_output (./include/linux/skbuff.h:4942 net/ipv4/ip_output.c:307 net/ipv4/ip_output.c:295) 
[    5.135469] __ip_queue_xmit (net/ipv4/ip_output.c:535) 
[    5.135494] __tcp_transmit_skb (net/ipv4/tcp_output.c:1462 (discriminator 4)) 
[    5.135520] ? kmalloc_reserve (net/core/skbuff.c:584) 
[    5.135547] tcp_rcv_state_process (net/ipv4/tcp_input.c:6669) 
[    5.135578] ? tcp_v4_connect (net/ipv4/tcp_ipv4.c:324) 
[    5.135603] tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1929) 
[    5.135627] __release_sock (./include/net/sock.h:1106 net/core/sock.c:2984) 
[    5.135653] release_sock (net/core/sock.c:3552) 
[    5.135677] inet_stream_connect (net/ipv4/af_inet.c:752) 
[    5.135703] kernel_connect (net/socket.c:3625) 
[    5.135728] ? mptcp_crypto_key_sha (net/mptcp/crypto.c:38) 
[    5.135759] __mptcp_subflow_connect (net/mptcp/subflow.c:1578) 
[    5.135795] mptcp_pm_create_subflow_or_signal_addr (net/mptcp/pm_netlink.c:600 (discriminator 3)) 
[    5.135847] ? __switch_to_asm (arch/x86/entry/entry_64.S:204) 
[    5.135873] ? finish_task_switch.isra.0 (./arch/x86/include/asm/irqflags.h:42 ./arch/x86/include/asm/irqflags.h:77 kernel/sched/sched.h:1397 kernel/sched/core.c:5154 kernel/sched/core.c:5272) 
[    5.135905] ? __schedule (kernel/sched/core.c:6733) 
[    5.135930] ? __lock_sock (net/core/sock.c:2966) 
[    5.135954] mptcp_pm_nl_work (net/mptcp/pm_netlink.c:874) 
[    5.135979] mptcp_worker (net/mptcp/protocol.c:2745) 
[    5.136004] process_one_work (kernel/workqueue.c:2633) 
[    5.136029] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[    5.136053] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[    5.136085] kthread (kernel/kthread.c:388) 
[    5.136109] ? __pfx_kthread (kernel/kthread.c:341) 
[    5.136141] ret_from_fork (arch/x86/kernel/process.c:147) 
[    5.136178] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__pskb_pull_tail:tcp_v4_early_demux:ip_rcv:__netif_receive_skb_one_core