Bug#771224: Just h
I just noticed this...
# uname -a
Linux web4 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux
root@web4:/etc/network#
[3906578.606506] ------------[ cut here ]------------
[3906578.606519] WARNING: CPU: 7 PID: 16494 at /build/linux-35gxh9/linux-3.16.36/net/ipv4/tcp_output.c:1085 tcp_fragment+0x2b1/0x2c0()
[3906578.606521] Modules linked in: sysdig_probe(O) xt_recent iptable_nat nf_nat_ipv4 xt_hashlimit xt_comment xt_AUDIT ipt_REJECT xt_addrtype xt_mark iptable_mangle xt_tcpudp xt_CT iptable_raw xt_multiport nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack ipt_ULOG xt_NFLOG nfnetlink_log xt_LOG nf_nat_tftp nf_nat_snmp_basic nf_conntrack_snmp nf_nat_sip nf_nat_pptp nf_nat_proto_gre nf_nat_irc nf_nat_h323 nf_nat_ftp nf_nat_amanda ts_kmp nf_conntrack_amanda nf_nat nf_conntrack_sane nf_conntrack_tftp nf_conntrack_sip nf_conntrack_proto_udplite nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink nfnetlink nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp nf_conntrack iptable_filter ip_tables x_tables nfsd auth_rpcgss oid_registry
[3906578.606557] nfsv3 nfs_acl nfs lockd sunrpc fscache intel_powerclamp coretemp kvm sr_mod crc32_pclmul iTCO_wdt cdrom iTCO_vendor_support ttm aesni_intel drm_kms_helper joydev evdev i2c_i801 acpi_power_meter aes_x86_64 ipmi_si lrw gf128mul glue_helper ablk_helper cryptd drm pcspkr lpc_ich mfd_core button wmi ac tpm_tis tpm ipmi_msghandler acpi_cpufreq processor thermal_sys shpchp i7core_edac edac_core ioatdma loop autofs4 ext4 crc16 mbcache jbd2 hid_generic usbhid hid dm_mod usb_storage sg sd_mod crc_t10dif crct10dif_generic ata_generic crct10dif_pclmul crct10dif_common crc32c_intel ata_piix ehci_pci uhci_hcd igb ehci_hcd i2c_algo_bit libata i2c_core dca ptp usbcore megaraid_sas pps_core usb_common scsi_mod
[3906578.606609] CPU: 7 PID: 16494 Comm: apache2 Tainted: G O 3.16.0-4-amd64 #1 Debian 3.16.36-1+deb8u2
[3906578.606611] Hardware name: Cisco Systems Inc UCSC-BSE-SFF-C200/UCSC-BSE-SFF-C200, BIOS C200.1.4.3k.0.071720130648 07/17/2013
[3906578.606613] 0000000000000000 ffffffff815123b5 0000000000000000 0000000000000009
[3906578.606616] ffffffff81068817 ffff88065a4cea00 ffff88066d5f00c0 0000000000000004
[3906578.606618] 00000000000010f8 000000001994ba7e ffffffff81474d21 ffff88065a4cea00
[3906578.606621] Call Trace:
[3906578.606622] <IRQ> [<ffffffff815123b5>] ? dump_stack+0x5d/0x78
[3906578.606634] [<ffffffff81068817>] ? warn_slowpath_common+0x77/0x90
[3906578.606636] [<ffffffff81474d21>] ? tcp_fragment+0x2b1/0x2c0
[3906578.606643] [<ffffffff8146b74e>] ? tcp_mark_head_lost+0x19e/0x260
[3906578.606645] [<ffffffff814708e6>] ? tcp_fastretrans_alert+0x626/0xac0
[3906578.606647] [<ffffffff8147173e>] ? tcp_ack+0x8be/0x11e0
[3906578.606650] [<ffffffff81472531>] ? tcp_rcv_established+0x1a1/0x6c0
[3906578.606653] [<ffffffff8147c36f>] ? tcp_v4_do_rcv+0x1af/0x4c0
[3906578.606655] [<ffffffff8147e149>] ? tcp_v4_rcv+0x6b9/0x7e0
[3906578.606658] [<ffffffff81459a30>] ? ip_rcv_finish+0x350/0x350
[3906578.606661] [<ffffffff81453436>] ? nf_hook_slow+0x76/0x130
[3906578.606664] [<ffffffff81459a30>] ? ip_rcv_finish+0x350/0x350
[3906578.606666] [<ffffffff81459ace>] ? ip_local_deliver_finish+0x9e/0x200
[3906578.606671] [<ffffffff81422873>] ? __netif_receive_skb_core+0x563/0x770
[3906578.606677] [<ffffffff8101c4a5>] ? read_tsc+0x5/0x20
[3906578.606680] [<ffffffff81422aff>] ? netif_receive_skb_internal+0x1f/0x80
[3906578.606682] [<ffffffff81423640>] ? napi_gro_receive+0xd0/0x100
[3906578.606693] [<ffffffffa020d1c0>] ? igb_poll+0x690/0xfb0 [igb]
[3906578.606698] [<ffffffff810a959e>] ? autoremove_wake_function+0xe/0x30
[3906578.606700] [<ffffffff81422e89>] ? net_rx_action+0x129/0x250
[3906578.606704] [<ffffffff8106d8d1>] ? __do_softirq+0xf1/0x2d0
[3906578.606706] [<ffffffff8106dce5>] ? irq_exit+0x95/0xa0
[3906578.606709] [<ffffffff8151b3a2>] ? do_IRQ+0x52/0xe0
[3906578.606713] [<ffffffff815191ed>] ? common_interrupt+0x6d/0x6d
[3906578.606714] <EOI>
[3906578.606716] ---[ end trace 048706d94a25c40e ]---
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