---[ cut here ]------------
[1934836.548977] WARNING: CPU: 2 PID: 0 at /build/buildd/linux-3.13.0/net/ipv4/tcp_output.c:1077 tcp_fragment+0x2e6/0x2f0()
[1934836.548981] Modules linked in: btrfs raid6_pq xor ufs qnx4 hfsplus hfs minix ntfs msdos jfs xfs libcrc32c ipt_REJECT xt_limit xt_tcpudp ipt_MASQUERADE xt_conntrack iptable_mangle iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat xt_multiport iptable_filter ip_tables nfnetlink_queue nfnetlink_log nfnetlink bluetooth gpio_ich serio_raw arc4 snd_hda_codec_realtek rt2800pci rt2800mmio rt2800lib rt2x00pci lpc_ich rt2x00mmio rt2x00lib snd_hda_intel xt_state mac80211 xt_pkttype snd_hda_codec xt_connlimit x_tables cfg80211 nf_conntrack snd_hwdep w83627ehf snd_pcm hwmon_vid eeprom_93cx6 crc_ccitt coretemp snd_page_alloc lp snd_timer parport snd soundcore mac_hid serpent_sse2_x86_64 xts serpent_generic lrw gf128mul glue_helper ablk_helper cryptd dm_crypt i915 psmouse video i2c_algo_bit e1000e drm_kms_helper drm r8169 ptp pps_core mii usb_storage
[1934836.549093] CPU: 2 PID: 0 Comm: swapper/2 Not tainted 3.13.0-43-generic #72-Ubuntu
[1934836.549097] Hardware name: To Be Filled By O.E.M. To Be Filled By O.E.M./To be filled by O.E.M., BIOS 080016  12/01/2010
[1934836.549101]  0000000000000009 ffff88007f303978 ffffffff81720bf6 0000000000000000
[1934836.549110]  ffff88007f3039b0 ffffffff810677cd ffff88007b70cc00 ffff88000283e900
[1934836.549117]  000000000000000c 0000000000000120 000000008e7cf513 ffff88007f3039c0
[1934836.549125] Call Trace:
[1934836.549129]  <IRQ>  [<ffffffff81720bf6>] dump_stack+0x45/0x56
[1934836.549144]  [<ffffffff810677cd>] warn_slowpath_common+0x7d/0xa0
[1934836.549151]  [<ffffffff810678aa>] warn_slowpath_null+0x1a/0x20
[1934836.549158]  [<ffffffff81676956>] tcp_fragment+0x2e6/0x2f0
[1934836.549165]  [<ffffffff8166cf18>] tcp_mark_head_lost+0x198/0x260
[1934836.549172]  [<ffffffff8166da61>] tcp_update_scoreboard+0x51/0x80
[1934836.549179]  [<ffffffff8167240d>] tcp_fastretrans_alert+0x6bd/0xb10
[1934836.549186]  [<ffffffff816738b5>] tcp_ack+0x555/0x810
[1934836.549193]  [<ffffffff81674022>] tcp_rcv_established+0x172/0x680
[1934836.549200]  [<ffffffff8167df75>] tcp_v4_do_rcv+0x1b5/0x480
[1934836.549207]  [<ffffffff81680380>] tcp_v4_rcv+0x780/0x7a0
[1934836.549215]  [<ffffffff8165b030>] ? ip_rcv_finish+0x350/0x350
[1934836.549222]  [<ffffffff81654824>] ? nf_hook_slow+0x74/0x130
[1934836.549228]  [<ffffffff8165b030>] ? ip_rcv_finish+0x350/0x350
[1934836.549235]  [<ffffffff8165b0d8>] ip_local_deliver_finish+0xa8/0x210
[1934836.549242]  [<ffffffff8165b3d8>] ip_local_deliver+0x48/0x80
[1934836.549249]  [<ffffffff8165ad5d>] ip_rcv_finish+0x7d/0x350
[1934836.549256]  [<ffffffff8165b6a8>] ip_rcv+0x298/0x3d0
[1934836.549264]  [<ffffffff81624ec6>] __netif_receive_skb_core+0x666/0x840
[1934836.549272]  [<ffffffff816250b8>] __netif_receive_skb+0x18/0x60
[1934836.549279]  [<ffffffff81625123>] netif_receive_skb+0x23/0x90
[1934836.549286]  [<ffffffff81625b70>] napi_gro_receive+0x80/0xb0
[1934836.549315]  [<ffffffffa00d97ff>] e1000_receive_skb+0x7f/0xe0 [e1000e]
[1934836.549338]  [<ffffffffa00dadaa>] e1000_clean_rx_irq+0x24a/0x400 [e1000e]
[1934836.549362]  [<ffffffffa00e28b4>] e1000e_poll+0x94/0x310 [e1000e]
[1934836.549370]  [<ffffffff816254a2>] net_rx_action+0x152/0x250
[1934836.549378]  [<ffffffff8106cc1c>] __do_softirq+0xec/0x2c0
[1934836.549385]  [<ffffffff8106d165>] irq_exit+0x105/0x110
[1934836.549393]  [<ffffffff817339e6>] do_IRQ+0x56/0xc0
[1934836.549400]  [<ffffffff817290ed>] common_interrupt+0x6d/0x6d
[1934836.549403]  <EOI>  [<ffffffff815d3622>] ? cpuidle_enter_state+0x52/0xc0
[1934836.549416]  [<ffffffff815d3749>] cpuidle_idle_call+0xb9/0x1f0
[1934836.549425]  [<ffffffff8101d35e>] arch_cpu_idle+0xe/0x30
[1934836.549432]  [<ffffffff810bef35>] cpu_startup_entry+0xc5/0x290
[1934836.549440]  [<ffffffff810413ed>] start_secondary+0x21d/0x2d0
[1934836.549445] ---[ end trace 40d24daf054877ce ]---