Bug#644406: libc6: Name resolution fails every second attempt with options rotate using IPv6 caching name servers

[Rob Lazzurs <rlazzurs@names.co.uk>]

Package: libc6
Version: 2.11.2-10
Severity: important
Tags: ipv6


With 2 or more IPv6 nameservers configured in resolv.conf and options rotate on every second lookup fails.  To reproduce just add options rotate and 2 or more caching name servers to resolv.conf.

This does not happen on the latest Ubuntu LTS or CentOS so I would suggest upstream does have a patch for this already.

If any more information is required please let me know.

Kind regards.

-- System Information:
Debian Release: 6.0.2
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.32-5-amd64 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages libc6 depends on:
ii  libc-bin                      2.11.2-10  Embedded GNU C Library: Binaries
ii  libgcc1                       1:4.4.5-8  GCC support library

libc6 recommends no packages.

Versions of packages libc6 suggests:
ii  debconf [debconf-2.0]         1.5.36.1   Debian configuration management sy
pn  glibc-doc                     <none>     (no description available)
ii  locales                       2.11.2-10  Embedded GNU C Library: National L

-- debconf information:
  glibc/upgrade: true
  glibc/disable-screensaver:
  glibc/restart-failed:
  glibc/restart-services: