======================================
| [    2.157740] ip (256) used greatest stack depth: 12344 bytes left
| [   16.932249] ------------[ cut here ]------------
| [   16.932325] kernel BUG at net/core/skbuff.c:2813!
| [   16.932388] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[   16.932490] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   16.932576] Workqueue: events mptcp_worker
[   16.932614] RIP: 0010:__pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 16.932656] 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)
[   16.932786] RSP: 0018:ffffb9fcc0140dc8 EFLAGS: 00010282
[   16.932827] RAX: 00000000fffffff2 RBX: 0000000000000014 RCX: 0000000000000014
[   16.932887] RDX: ffff8fdd825deaf8 RSI: 0000000000000100 RDI: 0000000000000000
[   16.932946] RBP: ffffb9fcc0140e08 R08: 00000000ffffffcc R09: 0000000000000008
[   16.933006] R10: ffff8fdd82ea70c8 R11: 0000000000000014 R12: ffff8fdd82ea7000
[   16.933065] R13: 0000000000000014 R14: ffff8fdd8276b700 R15: 0000000000000002
[   16.933126] FS:  0000000000000000(0000) GS:ffff8fddbfd80000(0000) knlGS:0000000000000000
[   16.933185] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   16.933234] CR2: 00007f1067b3c920 CR3: 000000003e644001 CR4: 0000000000770ef0
[   16.933295] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   16.933353] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   16.933412] PKRU: 55555554
[   16.933429] Call Trace:
[   16.933451]  <IRQ>
[   16.933473] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[   16.933511] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[   16.933542] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[   16.933575] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[   16.933606] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[   16.933638] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[   16.933671] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[   16.933704] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[   16.933738] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[   16.933770] ? __pskb_pull_tail (net/core/skbuff.c:2813) 
[   16.933803] tcp_v4_early_demux (./include/linux/skbuff.h:2731 ./include/linux/skbuff.h:2739 net/ipv4/tcp_ipv4.c:1966) 
[   16.933839] ip_rcv_finish_core.constprop.0 (./include/linux/skbuff.h:1139 ./include/net/dst_metadata.h:94 net/ipv4/ip_input.c:364) 
[   16.933878] ip_rcv (net/ipv4/ip_input.c:448 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:569) 
[   16.933910] ? ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 1)) 
[   16.933952] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[   16.933996] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) 
[   16.934027] __napi_poll (net/core/dev.c:6703) 
[   16.934062] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) 
[   16.934093] __do_softirq (kernel/softirq.c:553) 
[   16.934136] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   16.934168]  </IRQ>
[   16.934191]  <TASK>
[   16.934209] __local_bh_enable_ip (kernel/softirq.c:381) 
[   16.934242] __dev_queue_xmit (net/core/dev.c:4400) 
[   16.934276] ? nf_hook_slow (./include/linux/netfilter.h:154 net/netfilter/core.c:626) 
[   16.934309] ip_finish_output2 (./include/linux/netdevice.h:3172 ./include/net/neighbour.h:526 ./include/net/neighbour.h:540 net/ipv4/ip_output.c:235) 
[   16.934344] __ip_queue_xmit (net/ipv4/ip_output.c:535) 
[   16.934375] __tcp_transmit_skb (net/ipv4/tcp_output.c:1462 (discriminator 4)) 
[   16.934410] tcp_connect (net/ipv4/tcp_output.c:1480 net/ipv4/tcp_output.c:4100) 
[   16.934441] tcp_v4_connect (net/ipv4/tcp_ipv4.c:324) 
[   16.934476] __inet_stream_connect (net/ipv4/af_inet.c:678) 
[   16.934519] inet_stream_connect (net/ipv4/af_inet.c:750) 
[   16.934551] kernel_connect (net/socket.c:3625) 
[   16.934586] ? mptcp_crypto_key_sha (net/mptcp/crypto.c:38) 
[   16.934631] __mptcp_subflow_connect (net/mptcp/subflow.c:1578) 
[   16.934676] mptcp_pm_nl_add_addr_received (net/mptcp/pm_netlink.c:712 (discriminator 3)) 
[   16.934721] ? smp_call_function_many_cond (kernel/smp.c:133 kernel/smp.c:846) 
[   16.934769] ? sk_stream_write_space (net/core/stream.c:39) 
[   16.934810] ? mptcp_release_cb (net/mptcp/protocol.h:842 net/mptcp/protocol.h:863 net/mptcp/protocol.h:845 net/mptcp/protocol.c:3455) 
[   16.934844] ? sk_stream_write_space (net/core/stream.c:39) 
[   16.934887] mptcp_pm_nl_work (net/mptcp/pm_netlink.c:862) 
[   16.934920] mptcp_worker (net/mptcp/protocol.c:2745) 
[   16.934953] process_one_work (kernel/workqueue.c:2633) 
[   16.934985] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[   16.935023] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[   16.935056] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[   16.935098] kthread (kernel/kthread.c:388) 
[   16.935132] ? __pfx_kthread (kernel/kthread.c:341) 
[   16.935165] ret_from_fork (arch/x86/kernel/process.c:147) 
[   16.935199] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__pskb_pull_tail:tcp_v4_early_demux:ip_rcv:__netif_receive_skb_one_core