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[Bug 1527902] Re: 3.13.0-71: IPv6 UDP DNS packets are not received


This bug was fixed in the package linux - 4.2.0-27.32

linux (4.2.0-27.32) wily; urgency=low

  [ Brad Figg ]

  * Release Tracking Bug
    - LP: #1536867

  [ Andy Whitcroft ]

  * SAUCE: (no-up) add compat_uts_machine= kernel command line override
    - LP: #1520627

  [ Colin Ian King ]

  * SAUCE: (no-up) ACPI / tables: Add acpi_force_32bit_fadt_addr option to
    force 32 bit FADT addresses
    - LP: #1529381

  [ Eric Dumazet ]

  * SAUCE: (no-up) udp: properly support MSG_PEEK with truncated buffers
    - LP: #1527902

  [ Guilherme G. Piccoli ]

  * SAUCE: powerpc/eeh: Validate arch in eeh_add_device_early()
    - LP: #1486180

  [ Tim Gardner ]

  * SAUCE: (no-up) Revert "[SCSI] libiscsi: Reduce locking contention in
    fast path"
    - LP: #1517142
  * [Config] Add DRM ast driver to udeb installer image
    - LP: #1514711

  [ Upstream Kernel Changes ]

  * net/mlx5e: Re-eanble client vlan TX acceleration
    - LP: #1533249
  * net/mlx5e: Fix LSO vlan insertion
    - LP: #1533249
  * net/mlx5e: Fix inline header size calculation
    - LP: #1533249
  * net: usb: cdc_ncm: Adding Dell DW5812 LTE Verizon Mobile Broadband Card
    - LP: #1533118
  * net: usb: cdc_ncm: Adding Dell DW5813 LTE AT&T Mobile Broadband Card
    - LP: #1533118
  * powerpc/eeh: Fix recursive fenced PHB on Broadcom shiner adapter
    - LP: #1532942

linux (4.2.0-26.31) wily; urgency=low

  [ Luis Henriques ]

  * Release Tracking Bug
    - LP: #1535795
  * Merged back Ubuntu-4.2.0-25.30

 -- Brad Figg <brad.figg@xxxxxxxxxxxxx>  Thu, 21 Jan 2016 18:44:37 -0800

** Changed in: linux (Ubuntu Wily)
       Status: Fix Committed => Fix Released

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  3.13.0-71: IPv6 UDP DNS packets are not received

Status in linux package in Ubuntu:
  Fix Released
Status in linux-lts-trusty package in Ubuntu:
Status in linux-lts-utopic package in Ubuntu:
  Fix Committed
Status in linux-lts-trusty source package in Precise:
  In Progress
Status in linux source package in Trusty:
  Fix Committed
Status in linux source package in Vivid:
  Fix Committed
Status in linux source package in Wily:
  Fix Released
Status in linux source package in Xenial:
  Fix Released

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

  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

  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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