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[Joseph Salisbury <joseph.salisbury@xxxxxxxxxxxxx>]

I started a kernel bisect between 3.13.0-68 and 3.13.0-69. The kernel
bisect will require testing of about 7-10 test kernels.

I built the first test kernel, up to the following commit:
40c4e87e71354ccad701b7f36e522424e6504bca

The test kernel can be downloaded from:
http://kernel.ubuntu.com/~jsalisbury/lp1527902

Can you test that kernel and report back if it has the bug or not?  I
will build the next test kernel based on your test results.

Thanks in advance

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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.

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