Looks like that program dig is not affected, so not all stub resolvers are non working.
Kopete uses libiris xmpp library which uses jdns resolver. It is 100% reproducable. I tested also new upstream 4.x kernels and they do not have this problem. Only ubuntu kernels >= 3.13.0-69. If you need to test jdns library, upstream project has also example dns lookup cmdline tool in git repo: https://github.com/psi-im/iris/tree/master/src/jdns/tools/jdns (Call it with arg "-6" against some IPv6 DNS server) I tested it and it reacts exactly same as Kopete, on 3.13.0-69 kernel (and above) just do not receive UDP IPv6 packets. As I wrote in description strace show that every recvfrom() calls just return -EAGAIN. But wireshark see that packets was received. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1527902 Title: 3.13.0-71: IPv6 UDP DNS packets are not received Status in linux package in Ubuntu: In Progress Status in linux-lts-trusty package in Ubuntu: In Progress Bug description: After upgrading linux kernel from version 3.13.0-68 to 3.13.0-71 then Kopete (IM messenger) stopped working, cannot connect to any jabber server. I started debugging this problem and found out that, problem resolve when I boot back 3.13.0-68 kernel version (without touching any system files or packages). When I boot 3.13.0-71 Kopete always does not connect. Next I debugged that problem on 3.13.0-71 is just when /etc/resolv.conf contains only IPv6 addresses of DNS servers. Problem is comes down to dns resolver (jabber in Kopete has its own for SRV records) and syscall recvfrom() (on IPv6 socket) always return error -EAGAIN without any data returned. But wireshark see that DNS response was recevied. So it looks like that after 3.13.0-68 kernel was included some change which broke receiving UDP packets via IPv6 socket. IPv4 is OK. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1527902/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
