Bug#722075: libc6: getaddrinfo() sends DNS queries to random file descriptors

[Julien Palard <julien@palard.fr>]

Package: libc6
Version: 2.13-38
Followup-For: Bug #722075

Hi there,

I was able to reproduce this bug with only calls to getaddrinfo, as my getaddrinfo opens a NETLINK socket.

Here is a "small" c file leading you easily to the problem : http://pastebin.com/cWZphPK7

It also mean that getaddrinfo is not threadsafe, I think it may.

-- System Information:
Debian Release: 7.3
  APT prefers stable-updates
  APT policy: (500, 'stable-updates'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.2.0-4-amd64 (SMP w/4 CPU cores)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash

Versions of packages libc6 depends on:
ii  libc-bin  2.13-38
ii  libgcc1   1:4.7.2-5

libc6 recommends no packages.

Versions of packages libc6 suggests:
ii  debconf [debconf-2.0]  1.5.49
pn  glibc-doc              <none>
ii  locales                2.13-38

-- debconf information:
  glibc/upgrade: true
  glibc/restart-services:
  libraries/restart-without-asking: false
  glibc/disable-screensaver:
  glibc/restart-failed: