Bug#571102: libc6: dlclose crashes on amd64

[M G Berberich <berberic@forwiss.uni-passau.de>]

Package: libc6
Version: 2.7-18lenny2
Severity: normal


repeatedly opening and closing a dynamic libarry on amd64 with
dlopen/dlclose leads to a Segmentation fault on dlclose and wrecks the
stack. Perhaps the internal counter gets confused.

This only occurs on amd64 not on x86.

Example-code is attached.

-- System Information:
Debian Release: 5.0.4
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 2.6.26-2-amd64 (SMP w/2 CPU cores)
Locale: LANG=de_DE.UTF-8, LC_CTYPE=de_DE.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libc6 depends on:
ii  libgcc1                      1:4.3.2-1.1 GCC support library

libc6 recommends no packages.

Versions of packages libc6 suggests:
ii  glibc-doc                   2.7-18lenny2 GNU C Library: Documentation
ii  locales                     2.7-18lenny2 GNU C Library: National Language (

-- debconf information:
* glibc/upgrade: true
  glibc/disable-screensaver:
  glibc/restart-failed:
* glibc/restart-services: rsync postfix openbsd-inetd nis cupsys cron atd autofs