======================================
| [    1.666995] ip (235) used greatest stack depth: 12392 bytes left
| [    8.507379] ------------[ cut here ]------------
| [    8.507462] kernel BUG at net/core/skbuff.c:2813!
| [    8.507523] invalid opcode: 0000 [#1] PREEMPT SMP NOPTI
[    8.507629] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[    8.507723] Workqueue: events mptcp_worker
[    8.507758] RIP: 0010:__pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 8.507812] 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)
[    8.507966] RSP: 0018:ffffb41c80114da8 EFLAGS: 00010282
[    8.508035] RAX: 00000000fffffff2 RBX: 0000000000000014 RCX: 0000000000000014
[    8.508108] RDX: ffff9781c2e23878 RSI: 0000000000000100 RDI: 0000000000000000
[    8.508180] RBP: ffffb41c80114de8 R08: 00000000ffffffcc R09: 0000000000000008
[    8.508265] R10: ffff9781c20d90c8 R11: 0000000000000014 R12: 00000000ffffffff
[    8.508344] R13: 0000000000000014 R14: ffff9781c2655c00 R15: 0000000000000002
[    8.508406] FS:  0000000000000000(0000) GS:ffff9781fed00000(0000) knlGS:0000000000000000
[    8.508505] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    8.508567] CR2: 00007fe39d899000 CR3: 0000000006aa8006 CR4: 0000000000770ef0
[    8.508639] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[    8.508706] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[    8.508762] PKRU: 55555554
[    8.508782] Call Trace:
[    8.508808]  <IRQ>
[    8.508830] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[    8.508875] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[    8.508914] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    8.508941] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[    8.508987] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    8.509025] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[    8.509064] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    8.509097] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[    8.509129] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[    8.509155] ? __pskb_pull_tail (net/core/skbuff.c:2813) 
[    8.509185] tcp_v4_rcv (./include/linux/skbuff.h:2731 ./include/linux/skbuff.h:2739 net/ipv4/tcp_ipv4.c:2181) 
[    8.509216] ? raw_local_deliver (net/ipv4/raw.c:199) 
[    8.509245] ip_protocol_deliver_rcu (net/ipv4/ip_input.c:205 (discriminator 1)) 
[    8.509279] ip_local_deliver_finish (./include/linux/rcupdate.h:782 net/ipv4/ip_input.c:234) 
[    8.509310] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[    8.509345] process_backlog (./include/linux/rcupdate.h:782 net/core/dev.c:6053) 
[    8.509370] __napi_poll (net/core/dev.c:6703) 
[    8.509397] net_rx_action (net/core/dev.c:6774 net/core/dev.c:6886) 
[    8.509422] __do_softirq (kernel/softirq.c:553) 
[    8.509449] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[    8.509478]  </IRQ>
[    8.509495]  <TASK>
[    8.509508] __local_bh_enable_ip (kernel/softirq.c:381) 
[    8.509534] mptcp_check_data_fin.isra.0 (./include/linux/spinlock.h:397 ./include/net/sock.h:1767 net/mptcp/protocol.c:517 net/mptcp/protocol.c:525 net/mptcp/protocol.c:614 net/mptcp/protocol.c:570) 
[    8.509568] mptcp_worker (./arch/x86/include/asm/bitops.h:161 ./include/asm-generic/bitops/instrumented-atomic.h:86 net/mptcp/protocol.c:2749) 
[    8.509594] process_one_work (kernel/workqueue.c:2633) 
[    8.509623] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[    8.509656] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[    8.509682] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[    8.509714] kthread (kernel/kthread.c:388) 
[    8.509740] ? __pfx_kthread (kernel/kthread.c:341) 
[    8.509770] ret_from_fork (arch/x86/kernel/process.c:147) 
[    8.509799] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__pskb_pull_tail:tcp_v4_rcv:ip_protocol_deliver_rcu:ip_local_deliver_finish