[ 7436.491742] ------------[ cut here ]------------
[ 7436.491782] kernel BUG at /build/buildd/linux-3.13.0/drivers/net/xen-netfront.c:473!
[ 7436.491829] invalid opcode: 0000 [#1] SMP 
[ 7436.491857] Modules linked in: ip6t_REJECT nf_conntrack_ipv6 nf_defrag_ipv6 ip6table_filter ip6_tables ipt_REJECT xt_tcpudp nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack iptable_filter ip_tables x_tables joydev hid_generic usbhid intel_rapl hid crct10dif_pclmul crc32_pclmul ghash_clmulni_intel ppdev aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw i2c_piix4 parport_pc lp xenfs xen_privcmd parport mac_hid psmouse floppy
[ 7436.492149] CPU: 0 PID: 1451 Comm: haproxy Not tainted 3.13.0-37-generic #64-Ubuntu
[ 7436.492195] Hardware name: Xen HVM domU, BIOS 4.1.5 11/28/2013
[ 7436.492230] task: ffff880036efb000 ti: ffff880036e42000 task.ti: ffff880036e42000
[ 7436.492273] RIP: 0010:[<ffffffff81532be3>]  [<ffffffff81532be3>] xennet_start_xmit+0x913/0x980
[ 7436.492329] RSP: 0018:ffff880036e43a08  EFLAGS: 00010002
[ 7436.492361] RAX: 0000000000001000 RBX: 0000000000000f82 RCX: 01ffff0000000000
[ 7436.492402] RDX: 0000000000001040 RSI: 00000000000000ee RDI: 00000000000000be
[ 7436.492444] RBP: ffff880036e43aa8 R08: 0000000000000000 R09: ffff88003994e000
[ 7436.492486] R10: 000000000006a388 R11: 0000000000000000 R12: 0000000000000042
[ 7436.492527] R13: ffffea0000e6cb40 R14: ffff880036a45688 R15: ffff880036950000
[ 7436.492574] FS:  00007f4a3ab9e740(0000) GS:ffff88003f800000(0000) knlGS:0000000000000000
[ 7436.492621] CS:  0010 DS: 0000 ES: 0000 CR0: 000000008005003b
[ 7436.492655] CR2: 0000000000415040 CR3: 00000000369f0000 CR4: 00000000000006f0
[ 7436.492699] Stack:
[ 7436.492713]  ffff88003f81be00 0000000000000283 ffff880036950948 ffff880036a45688
[ 7436.492762]  0000000ca010e591 0000000000000000 ffff88003a2f0fd8 ffff880036951170
[ 7436.492809]  ffff880036950970 ffff880036e750e8 ffff880036e43b30 ffffffff00000304
[ 7436.492857] Call Trace:
[ 7436.492879]  [<ffffffff81624bc8>] dev_hard_start_xmit+0x318/0x560
[ 7436.492917]  [<ffffffff81643bfe>] sch_direct_xmit+0xee/0x1c0
[ 7436.492953]  [<ffffffff81625040>] __dev_queue_xmit+0x230/0x500
[ 7436.492989]  [<ffffffff81625320>] dev_queue_xmit+0x10/0x20
[ 7436.493023]  [<ffffffff8165dac9>] ip_finish_output+0x2c9/0x3b0
[ 7436.493058]  [<ffffffff8165ef18>] ip_output+0x58/0x90
[ 7436.493090]  [<ffffffff8165e675>] ip_local_out+0x25/0x30
[ 7436.493123]  [<ffffffff8165e9da>] ip_queue_xmit+0x13a/0x3d0
[ 7436.494205]  [<ffffffff816757a9>] tcp_transmit_skb+0x469/0x8d0
[ 7436.495312]  [<ffffffff81675d50>] tcp_write_xmit+0x140/0xb00
[ 7436.495596]  [<ffffffff8167697e>] __tcp_push_pending_frames+0x2e/0xc0
[ 7436.495596]  [<ffffffff81667dda>] tcp_sendpage+0x60a/0x6d0
[ 7436.495596]  [<ffffffff811ea160>] ? splice_from_pipe_feed+0x120/0x120
[ 7436.495596]  [<ffffffff8169195e>] inet_sendpage+0x6e/0xe0
[ 7436.495596]  [<ffffffff81668d06>] ? tcp_cleanup_rbuf+0x76/0x120
[ 7436.495596]  [<ffffffff8160925b>] kernel_sendpage+0x1b/0x30
[ 7436.495596]  [<ffffffff81609297>] sock_sendpage+0x27/0x30
[ 7436.495596]  [<ffffffff811ea1bf>] pipe_to_sendpage+0x5f/0x70
[ 7436.495596]  [<ffffffff811ea0be>] splice_from_pipe_feed+0x7e/0x120
[ 7436.495596]  [<ffffffff811ea160>] ? splice_from_pipe_feed+0x120/0x120
[ 7436.495596]  [<ffffffff811ea40e>] __splice_from_pipe+0x6e/0x90
[ 7436.495596]  [<ffffffff81725542>] ? mutex_lock+0x12/0x2f
[ 7436.495596]  [<ffffffff811ea160>] ? splice_from_pipe_feed+0x120/0x120
[ 7436.495596]  [<ffffffff811ec031>] splice_from_pipe+0x51/0x70
[ 7436.495596]  [<ffffffff811ec065>] generic_splice_sendpage+0x15/0x20
[ 7436.495596]  [<ffffffff811ec534>] SyS_splice+0x224/0x750
[ 7436.495596]  [<ffffffff8172f82d>] system_call_fastpath+0x1a/0x1f
[ 7436.495596] Code: ff ff e9 68 fc ff ff be 3c 08 00 00 48 c7 c7 88 e2 aa 81 e8 30 4c b3 ff 48 c7 c7 b8 eb aa 81 31 c0 e8 66 5d 1e 00 e9 1e ff ff ff <0f> 0b 0f 0b e8 b4 2f 10 00 85 c0 66 90 0f 84 05 fc ff ff 44 89 
[ 7436.495596] RIP  [<ffffffff81532be3>] xennet_start_xmit+0x913/0x980
[ 7436.495596]  RSP <ffff880036e43a08>