Bug#534312: upgrade of libc6 causes SEGFAULTs

[Fonso <ulfonk_mennhar@gmx.de>]

Package: libc6
Version: 2.9-18
Severity: important

When installing libc6 from unstable on lenny multiple important programs
SEGFAULT. Among them are cups and update-menus.

To reproduce install libc6, libc6-dev, libc6-i386, libc6-dbg and locales 
from sid on lenny and try running update-menus with any parameters.

To examine the problem further I rebuilt update-menus from source with
"-g -O0" and ran it in gdb with the following result:

(gdb) run
Starting program: /home/alve/menu/menu-2.1.41/update-menus/update-menus

Program received signal SIGSEGV, Segmentation fault.
0x0000000000000000 in ?? ()
(gdb) bt
#0  0x0000000000000000 in ?? ()
#1  0x00007f9bc7c93149 in *__GI___dl_iterate_phdr (callback=0x7f9bc7ef4d60 <_Unwind_IteratePhdrCallback>, data=0x7fffd08a3370) at dl-iteratephdr.c:75
#2  0x00007f9bc7ef5b59 in _Unwind_Find_FDE (pc=0x7f9bc7ef3f1d, bases=0x7fffd08a3938) at ../../../src/libgcc/../gcc/unwind-dw2-fde-glibc.c:420
#3  0x00007f9bc7ef2f83 in uw_frame_state_for (context=0x7fffd08a3890, fs=<value optimized out>) at ../../../src/libgcc/../gcc/unwind-dw2.c:1121
#4  0x00007f9bc7ef38d9 in uw_init_context_1 (context=0x7fffd08a3890, outer_cfa=0x7fffd08a39d0, outer_ra=0x7f9bc88a6040) at ../../../src/libgcc/../gcc/unwind-dw2.c:1427
#5  0x00007f9bc7ef3f1e in _Unwind_RaiseException (exc=0xa93fd0) at ../../../src/libgcc/../gcc/unwind.inc:93
#6  0x00007f9bc844379d in __cxa_throw () from /usr/lib/libstdc++.so.6
#7  0x0000000000418555 in parsestream::get_char (this=0xa5c670) at parsestream.cc:234
#8  0x0000000000419237 in parsestream::get_name (this=0xa5c670, r=@0x7fffd08a3b70) at parsestream.cc:286
#9  0x000000000040765a in translateinfo (this=0xa5c630, filename=@0x7fffd08a3c40) at update-menus.cc:376
#10 0x0000000000407ce2 in read_roottranslateinfo () at update-menus.cc:997
#11 0x000000000040d1a5 in main (argc=1, argv=0x7fffd08a3f18) at update-menus.cc:1069
(gdb)

When downgrading libc6 and locales to 2.7 and running the same binary again the
problem vanishes.

-- System Information:
Debian Release: 5.0.1
  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=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)
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:
pn  glibc-doc                     <none>     (no description available)
ii  locales                       2.9-18     GNU C Library: National Language (

-- debconf information:
  glibc/upgrade: true
  glibc/disable-screensaver:
  glibc/restart-failed:
* glibc/restart-services: ssh rsync exim4 cups cron atd