Gentoo's Bugzilla –
Attachment 339244 Details for
Bug 458116=sys-kernel/gentoo-sources-{3.7.5,3.8.3} - skb_over_panic by "java" process, invalid opcode 0000 in RIP skb_put called by tcp_sendmsg when sysctl net.ipv4.tcp_mtu_probing!=0; different call stacks, same head and bottom.