======================================
| [   32.432292][  T273] ip (273) used greatest stack depth: 23840 bytes left
| [   64.203018][    C1] ------------[ cut here ]------------
| [   64.203373][    C1] kernel BUG at net/core/skbuff.c:2813!
| [   64.203563][    C1] invalid opcode: 0000 [#1] PREEMPT SMP KASAN NOPTI
[   64.204043][    C1] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.3-0-ga6ed6b701f0a-prebuilt.qemu.org 04/01/2014
[   64.204417][    C1] Workqueue: events mptcp_worker
[ 64.204599][ C1] RIP: 0010:__pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 64.204814][ C1] Code: e9 52 f7 ff ff 48 8b 7c 24 38 be 02 00 00 00 e8 8e 9c ff ff 48 83 c4 58 31 c0 5b 41 5c 41 5d 41 5e 41 5f 5d c3 cc cc cc cc 90 <0f> 0b 48 c7 44 24 38 00 00 00 00 e9 dc fa ff ff 84 c9 0f 84 4b f9
All code
========
   0:	e9 52 f7 ff ff       	jmp    0xfffffffffffff757
   5:	48 8b 7c 24 38       	mov    0x38(%rsp),%rdi
   a:	be 02 00 00 00       	mov    $0x2,%esi
   f:	e8 8e 9c ff ff       	call   0xffffffffffff9ca2
  14:	48 83 c4 58          	add    $0x58,%rsp
  18:	31 c0                	xor    %eax,%eax
  1a:	5b                   	pop    %rbx
  1b:	41 5c                	pop    %r12
  1d:	41 5d                	pop    %r13
  1f:	41 5e                	pop    %r14
  21:	41 5f                	pop    %r15
  23:	5d                   	pop    %rbp
  24:	c3                   	ret
  25:	cc                   	int3
  26:	cc                   	int3
  27:	cc                   	int3
  28:	cc                   	int3
  29:	90                   	nop
  2a:*	0f 0b                	ud2		<-- trapping instruction
  2c:	48 c7 44 24 38 00 00 	movq   $0x0,0x38(%rsp)
  33:	00 00 
  35:	e9 dc fa ff ff       	jmp    0xfffffffffffffb16
  3a:	84 c9                	test   %cl,%cl
  3c:	0f                   	.byte 0xf
  3d:	84 4b f9             	test   %cl,-0x7(%rbx)

Code starting with the faulting instruction
===========================================
   0:	0f 0b                	ud2
   2:	48 c7 44 24 38 00 00 	movq   $0x0,0x38(%rsp)
   9:	00 00 
   b:	e9 dc fa ff ff       	jmp    0xfffffffffffffaec
  10:	84 c9                	test   %cl,%cl
  12:	0f                   	.byte 0xf
  13:	84 4b f9             	test   %cl,-0x7(%rbx)
[   64.205410][    C1] RSP: 0018:ffffc900001c8ac0 EFLAGS: 00010282
[   64.205626][    C1] RAX: 00000000fffffff2 RBX: ffff88802a9a1af4 RCX: 0000000000000004
[   64.205879][    C1] RDX: dffffc0000000000 RSI: 1ffff11000bd0029 RDI: ffff888005e80148
[   64.206135][    C1] RBP: ffffc900001c8b40 R08: 0000000000000014 R09: ffff88802a9a1b3c
[   64.206391][    C1] R10: ffff88802a9a1b40 R11: ffff88802a9a1b40 R12: ffff88802a9a1a80
[   64.206643][    C1] R13: 0000000000000100 R14: 0000000000000000 R15: ffff88802a9a1b32
[   64.206914][    C1] FS:  0000000000000000(0000) GS:ffff888036080000(0000) knlGS:0000000000000000
[   64.207208][    C1] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[   64.207419][    C1] CR2: 00007f912237d920 CR3: 0000000002480002 CR4: 0000000000770ef0
[   64.207672][    C1] DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
[   64.207920][    C1] DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
[   64.208166][    C1] PKRU: 55555554
[   64.208295][    C1] Call Trace:
[   64.208426][    C1]  <IRQ>
[ 64.208512][ C1] ? die (arch/x86/kernel/dumpstack.c:421 arch/x86/kernel/dumpstack.c:434 arch/x86/kernel/dumpstack.c:447) 
[ 64.208643][ C1] ? do_trap (arch/x86/kernel/traps.c:113 arch/x86/kernel/traps.c:154) 
[ 64.208769][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 64.208935][ C1] ? do_error_trap (./arch/x86/include/asm/traps.h:58 arch/x86/kernel/traps.c:175) 
[ 64.209104][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 64.209269][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 64.209434][ C1] ? handle_invalid_op (arch/x86/kernel/traps.c:213) 
[ 64.209604][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 64.209770][ C1] ? exc_invalid_op (arch/x86/kernel/traps.c:265) 
[ 64.209938][ C1] ? asm_exc_invalid_op (./arch/x86/include/asm/idtentry.h:568) 
[ 64.210129][ C1] ? __pskb_pull_tail (net/core/skbuff.c:2813 (discriminator 1)) 
[ 64.210296][ C1] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 64.210466][ C1] tcp_v4_early_demux (./include/linux/skbuff.h:2731 ./include/linux/skbuff.h:2739 net/ipv4/tcp_ipv4.c:1966) 
[ 64.210639][ C1] ip_rcv_finish_core.constprop.0 (./include/linux/skbuff.h:2943 ./include/linux/ip.h:21 net/ipv4/ip_input.c:344) 
[ 64.210862][ C1] ip_rcv (net/ipv4/ip_input.c:448 ./include/linux/netfilter.h:314 ./include/linux/netfilter.h:308 net/ipv4/ip_input.c:569) 
[ 64.210992][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 64.211160][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 64.211329][ C1] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 64.211497][ C1] ? __pfx_ip_rcv (net/ipv4/ip_input.c:562) 
[ 64.211662][ C1] __netif_receive_skb_one_core (net/core/dev.c:5610 (discriminator 4)) 
[ 64.211867][ C1] ? __pfx___netif_receive_skb_one_core (net/core/dev.c:5603) 
[ 64.212075][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 64.212243][ C1] ? process_backlog (./include/linux/rcupdate.h:298 ./include/linux/rcupdate.h:750 net/core/dev.c:6051) 
[ 64.212408][ C1] process_backlog (./include/linux/rcupdate.h:779 net/core/dev.c:6053) 
[ 64.212575][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 64.212743][ C1] __napi_poll.constprop.0 (net/core/dev.c:6703) 
[ 64.212910][ C1] net_rx_action (net/core/dev.c:6772 net/core/dev.c:6886) 
[ 64.213077][ C1] ? __pfx_net_rx_action (net/core/dev.c:6850) 
[ 64.213243][ C1] ? hlock_class (kernel/locking/lockdep.c:223) 
[ 64.213414][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 64.213579][ C1] __do_softirq (kernel/softirq.c:553) 
[ 64.213747][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 64.213916][ C1] do_softirq (kernel/softirq.c:454 kernel/softirq.c:441) 
[   64.214044][    C1]  </IRQ>
[   64.214131][    C1]  <TASK>
[ 64.214214][ C1] __local_bh_enable_ip (kernel/softirq.c:381) 
[ 64.214381][ C1] ? __dev_queue_xmit (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:818 net/core/dev.c:4399) 
[ 64.214546][ C1] __dev_queue_xmit (net/core/dev.c:4400) 
[ 64.214713][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 64.214895][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 64.215102][ C1] ? __pfx___dev_queue_xmit (net/core/dev.c:4281) 
[ 64.215273][ C1] ip_finish_output2 (./include/net/neighbour.h:540 net/ipv4/ip_output.c:235) 
[ 64.215440][ C1] ? __pfx_mptcp_established_options (net/mptcp/options.c:828) 
[ 64.215651][ C1] ? __pfx_ip_finish_output2 (net/ipv4/ip_output.c:199) 
[ 64.215817][ C1] ? __ip_finish_output (./include/linux/skbuff.h:1624 ./include/linux/skbuff.h:4942 net/ipv4/ip_output.c:307 net/ipv4/ip_output.c:295) 
[ 64.215982][ C1] __ip_queue_xmit (net/ipv4/ip_output.c:535 (discriminator 4)) 
[ 64.216150][ C1] __tcp_transmit_skb (net/ipv4/tcp_output.c:1462 (discriminator 4)) 
[ 64.216318][ C1] ? __alloc_skb (net/core/skbuff.c:688) 
[ 64.216487][ C1] ? __pfx___tcp_transmit_skb (net/ipv4/tcp_output.c:1283) 
[ 64.216657][ C1] ? __tcp_send_ack.part.0 (./include/linux/skbuff.h:1301 net/ipv4/tcp_output.c:4206) 
[ 64.216824][ C1] tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6482) 
[ 64.217035][ C1] ? hlock_class (./arch/x86/include/asm/bitops.h:227 ./arch/x86/include/asm/bitops.h:239 ./include/asm-generic/bitops/instrumented-non-atomic.h:142 kernel/locking/lockdep.c:228) 
[ 64.217201][ C1] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 64.217327][ C1] ? __pfx_tcp_rcv_synsent_state_process (net/ipv4/tcp_input.c:6336) 
[ 64.217531][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 64.217740][ C1] ? kvm_clock_get_cycles (./arch/x86/include/asm/preempt.h:94 arch/x86/kernel/kvmclock.c:80 arch/x86/kernel/kvmclock.c:86) 
[ 64.217909][ C1] ? ktime_get (kernel/time/timekeeping.c:195 (discriminator 4) kernel/time/timekeeping.c:289 (discriminator 4) kernel/time/timekeeping.c:388 (discriminator 4) kernel/time/timekeeping.c:848 (discriminator 4)) 
[ 64.218038][ C1] tcp_rcv_state_process (net/ipv4/tcp_input.c:6669) 
[ 64.218202][ C1] ? __lock_release (kernel/locking/lockdep.c:5430) 
[ 64.218371][ C1] ? __release_sock (./include/net/sock.h:1106 net/core/sock.c:2984) 
[ 64.218540][ C1] ? __pfx_tcp_rcv_state_process (net/ipv4/tcp_input.c:6624) 
[ 64.218749][ C1] ? mark_lock (kernel/locking/lockdep.c:4656 (discriminator 3)) 
[ 64.218888][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 64.219056][ C1] tcp_v4_do_rcv (net/ipv4/tcp_ipv4.c:1929) 
[ 64.219230][ C1] __release_sock (./include/net/sock.h:1106 net/core/sock.c:2984) 
[ 64.219395][ C1] release_sock (net/core/sock.c:3552) 
[ 64.219560][ C1] inet_stream_connect (net/ipv4/af_inet.c:752) 
[ 64.219726][ C1] kernel_connect (net/socket.c:3625) 
[ 64.220004][ C1] ? __pfx_kernel_connect (net/socket.c:3620) 
[ 64.220172][ C1] ? mptcp_crypto_key_sha (net/mptcp/crypto.c:38) 
[ 64.220338][ C1] ? __pfx_mptcp_crypto_key_sha (net/mptcp/crypto.c:32) 
[ 64.220504][ C1] ? net_generic (./include/linux/rcupdate.h:308 ./include/linux/rcupdate.h:783 ./include/net/netns/generic.h:48) 
[ 64.220769][ C1] ? mptcp_pm_nl_get_flags_and_ifindex_by_id (net/mptcp/pm_netlink.c:1367) 
[ 64.220975][ C1] __mptcp_subflow_connect (net/mptcp/subflow.c:1578) 
[ 64.221141][ C1] ? __pfx___mptcp_subflow_connect (net/mptcp/subflow.c:1518) 
[ 64.221347][ C1] ? fill_remote_addresses_vec (net/mptcp/pm_netlink.c:418) 
[ 64.221648][ C1] ? find_held_lock (kernel/locking/lockdep.c:5244) 
[ 64.221814][ C1] ? mark_held_locks (kernel/locking/lockdep.c:4274) 
[ 64.221982][ C1] mptcp_pm_create_subflow_or_signal_addr (net/mptcp/pm_netlink.c:600 (discriminator 3)) 
[ 64.222193][ C1] ? __pfx_mptcp_pm_create_subflow_or_signal_addr (net/mptcp/pm_netlink.c:514) 
[ 64.222538][ C1] ? lock_acquire.part.0 (kernel/locking/lockdep.c:467 kernel/locking/lockdep.c:5756) 
[ 64.222702][ C1] ? mptcp_pm_nl_work (./arch/x86/include/asm/jump_label.h:27 net/mptcp/pm_netlink.c:857) 
[ 64.222886][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 64.223052][ C1] ? do_raw_spin_lock (./arch/x86/include/asm/atomic.h:115 ./include/linux/atomic/atomic-arch-fallback.h:2164 ./include/linux/atomic/atomic-instrumented.h:1296 ./include/asm-generic/qspinlock.h:111 kernel/locking/spinlock_debug.c:116) 
[ 64.223315][ C1] ? __pfx_do_raw_spin_lock (kernel/locking/spinlock_debug.c:114) 
[ 64.223479][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 64.223643][ C1] ? mptcp_pm_nl_work (./arch/x86/include/asm/jump_label.h:27 net/mptcp/pm_netlink.c:857) 
[ 64.223815][ C1] mptcp_pm_nl_work (net/mptcp/pm_netlink.c:874) 
[ 64.224078][ C1] ? mptcp_worker (net/mptcp/protocol.c:2737) 
[ 64.224246][ C1] mptcp_worker (net/mptcp/protocol.c:2745) 
[ 64.224417][ C1] ? __pfx_mptcp_worker (net/mptcp/protocol.c:2730) 
[ 64.224586][ C1] ? lock_acquire (./include/trace/events/lock.h:24 kernel/locking/lockdep.c:5725) 
[ 64.224846][ C1] ? process_one_work (kernel/workqueue.c:2609) 
[ 64.225013][ C1] process_one_work (kernel/workqueue.c:2633) 
[ 64.225181][ C1] ? __pfx_lock_acquire.part.0 (kernel/locking/lockdep.c:5719) 
[ 64.225350][ C1] ? __pfx_process_one_work (kernel/workqueue.c:2542) 
[ 64.225614][ C1] ? assign_work (kernel/workqueue.c:1101) 
[ 64.225783][ C1] worker_thread (kernel/workqueue.c:2700 kernel/workqueue.c:2787) 
[ 64.225949][ C1] ? lockdep_hardirqs_on_prepare.part.0 (kernel/locking/lockdep.c:4300 kernel/locking/lockdep.c:4359) 
[ 64.226156][ C1] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 64.226418][ C1] ? __pfx_worker_thread (kernel/workqueue.c:2733) 
[ 64.226581][ C1] kthread (kernel/kthread.c:388) 
[ 64.226706][ C1] ? __pfx_kthread (kernel/kthread.c:341) 
[ 64.226891][ C1] ret_from_fork (arch/x86/kernel/process.c:147) 
[ 64.227058][ C1] ? __pfx_kthread (kernel/kthread.c:341) 


Finger prints:
__pskb_pull_tail:tcp_v4_early_demux:ip_rcv:__netif_receive_skb_one_core