Kernel warnings about ipv6 slow path?

kern.log

Jul 19 11:17:52 ramoth kernel: [5545563.660472] ------------[ cut here ]------------
Jul 19 11:17:52 ramoth kernel: [5545563.660475] WARNING: CPU: 18 PID: 22691 at /build/linux-lts-trusty-buxpxv/linux-lts-trusty-3.13.0/net/core/dst.c:286 dst_release+0x50/0x60()
Jul 19 11:17:52 ramoth kernel: [5545563.660476] Modules linked in: btrfs(X) raid6_pq(X) xor(X) ufs(X) qnx4(X) hfsplus(X) hfs(X) minix(X) ntfs(X) msdos(X) jfs(X) reiserfs(X) nfsv3 ipmi_si act_police cls_basic cls_flow cls_fw cls_u32 sch_tbf sch_prio sch_htb sch_hfsc sch_ingress sch_sfq xt_LOG xt_time xt_connlimit xt_realm xt_addrtype iptable_raw xt_comment xt_recent xt_policy xt_nat ipt_ULOG ipt_REJECT ipt_MASQUERADE ipt_ECN ipt_CLUSTERIP ipt_ah xt_set ip_set 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_conntrack_sane nf_conntrack_tftp nf_conntrack_sip nf_conntrack_proto_sctp nf_conntrack_pptp nf_conntrack_proto_gre nf_conntrack_netlink nf_conntrack_netbios_ns nf_conntrack_broadcast nf_conntrack_irc nf_conntrack_h323 nf_conntrack_ftp xt_TPROXY nf_defrag_ipv6 xt_tcpmss xt_pkttype xt_physdev xt_owner xt_NFQUEUE xt_NFLOG nfnetlink_log xt_mark xt_mac xt_limit xt_length xt_iprange xt_helper xt_hashl
Jul 19 11:17:52 ramoth kernel: imit xt_DSCP xt_dscp xt_dccp xt_conntrack xt_connmark xt_CLASSIFY xt_AUDIT xt_tcpudp xt_state iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_conntrack iptable_mangle nfnetlink xt_multiport iptable_filter ip_tables x_tables w83627hf_wdt nfsd nfs_acl auth_rpcgss nfs fscache lockd sunrpc kvm_amd kvm crct10dif_pclmul crc32_pclmul aesni_intel ablk_helper cryptd shpchp lrw joydev ipmi_devintf psmouse lp gf128mul xfs mac_hid i2c_piix4 serio_raw glue_helper aes_x86_64 fam15h_power k10temp libcrc32c amd64_edac_mod edac_core parport edac_mce_amd ses enclosure pata_acpi igb dca i2c_algo_bit hid_generic ptp megaraid_sas pata_atiixp ahci libahci pps_core usbhid hid
Jul 19 11:17:52 ramoth kernel: [5545563.660546] CPU: 18 PID: 22691 Comm: postgres Tainted: G        W   X 3.13.0-86-generic #130~precise1-Ubuntu
Jul 19 11:17:52 ramoth kernel: [5545563.660547] Hardware name: Supermicro H8DGU/H8DGU, BIOS 3.5c       03/18/2016
Jul 19 11:17:52 ramoth kernel: [5545563.660548]  0000000000000000 ffff881fc7deda48 ffffffff817615de 0000000000000000
Jul 19 11:17:52 ramoth kernel: [5545563.660554]  000000000000011e ffff881fc7deda88 ffffffff8106c23c ffff881fc7deda78
Jul 19 11:17:52 ramoth kernel: [5545563.660560]  ffff8810475b0440 ffff8810475b0848 ffff883fc7b86100 ffff8810475b07b8
Jul 19 11:17:52 ramoth kernel: [5545563.660566] Call Trace:
Jul 19 11:17:52 ramoth kernel: [5545563.660570]  [<ffffffff817615de>] dump_stack+0x64/0x82
Jul 19 11:17:52 ramoth kernel: [5545563.660573]  [<ffffffff8106c23c>] warn_slowpath_common+0x8c/0xc0
Jul 19 11:17:52 ramoth kernel: [5545563.660577]  [<ffffffff8106c28a>] warn_slowpath_null+0x1a/0x20
Jul 19 11:17:52 ramoth kernel: [5545563.660581]  [<ffffffff81661450>] dst_release+0x50/0x60
Jul 19 11:17:52 ramoth kernel: [5545563.660584]  [<ffffffff816f84cc>] ip6_cork_release.isra.26+0x6c/0x130
Jul 19 11:17:52 ramoth kernel: [5545563.660588]  [<ffffffff816f8961>] ip6_push_pending_frames+0x321/0x450
Jul 19 11:17:52 ramoth kernel: [5545563.660592]  [<ffffffff81713ab6>] udp_v6_push_pending_frames+0x136/0x320
Jul 19 11:17:52 ramoth kernel: [5545563.660596]  [<ffffffff81714a18>] udpv6_sendmsg+0x8c8/0xad0
Jul 19 11:17:52 ramoth kernel: [5545563.660599]  [<ffffffff811a955a>] ? mpol_misplaced+0x1aa/0x290
Jul 19 11:17:52 ramoth kernel: [5545563.660603]  [<ffffffff810a9aa7>] ? task_numa_fault+0xa7/0x1d0
Jul 19 11:17:52 ramoth kernel: [5545563.660607]  [<ffffffff816c9e01>] inet_sendmsg+0x61/0xb0
Jul 19 11:17:52 ramoth kernel: [5545563.660611]  [<ffffffff8132c617>] ? apparmor_socket_sendmsg+0x17/0x20
Jul 19 11:17:52 ramoth kernel: [5545563.660614]  [<ffffffff8163f1df>] sock_sendmsg+0xaf/0xc0
Jul 19 11:17:52 ramoth kernel: [5545563.660618]  [<ffffffff8163fb08>] SYSC_sendto+0x138/0x190
Jul 19 11:17:52 ramoth kernel: [5545563.660622]  [<ffffffff811cfd03>] ? __sb_end_write+0x33/0x70
Jul 19 11:17:52 ramoth kernel: [5545563.660626]  [<ffffffff817724da>] ? do_page_fault+0x1a/0x70
Jul 19 11:17:52 ramoth kernel: [5545563.660630]  [<ffffffff8164013e>] SyS_sendto+0xe/0x10
Jul 19 11:17:52 ramoth kernel: [5545563.660633]  [<ffffffff81776e1d>] system_call_fastpath+0x1a/0x1f
Jul 19 11:17:52 ramoth kernel: [5545563.660635] ---[ end trace c35af741b7500c9f ]---