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Bug#518131: marked as done (libqt4-opengl: dlclose libQtOpenGL.so segmentation fault)

Your message dated Fri, 6 Mar 2009 18:38:06 +0100
with message-id <200903061838.07415.tobiasrautenkranz@web.de>
and subject line Resolved
has caused the Debian Bug report #518131,
regarding libqt4-opengl: dlclose libQtOpenGL.so segmentation fault
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
518131: http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=518131
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: libqt4-opengl
Version: 4.5.0~rc1-2
Severity: minor

If libQtOpenGL is loaded with dlopen the program segfaults when libQtOpenGL is unloaded.

$ gcc -o dltest -ldl dltest.c
$ ./dltest /usr/lib/libQtOpenGL.so
opening /usr/lib/libQtOpenGL.so...
closing /usr/lib/libQtOpenGL.so...
Segmentation fault (core dumped)

My build from upstream links against GLU and does not crash on dlclose.

$ ldd /usr/lib/libQtOpenGL.so | grep GLU
$ ldd /usr/local/Trolltech/Qt-4.5.0/lib/libQtOpenGL.so | grep GLU
         libGLU.so.1 => /usr/lib/libGLU.so.1 (0xb7e01000)

Linking libqt4-opengl against GLU should fix it.

$ ./dltest /usr/lib/libGLU.so /usr/lib/libQtOpenGL.so
opening /usr/lib/libGLU.so...
opening /usr/lib/libQtOpenGL.so...
closing /usr/lib/libQtOpenGL.so...
closing /usr/lib/libGLU.so...
done


-- System Information:
Debian Release: lenny/sid
  APT prefers unstable
  APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: i386 (i686)

Kernel: Linux 2.6.26-1-686 (SMP w/1 CPU core)
Locale: LANG=de_CH.UTF-8, LC_CTYPE=de_CH.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/bash

Versions of packages libqt4-opengl depends on:
ii  libc6                        2.9-4       GNU C Library: Shared libraries
ii  libfreetype6                 2.3.7-2     FreeType 2 font engine, shared lib
ii  libgcc1                      1:4.3.3-3   GCC support library
ii  libgl1-mesa-glx [libgl1]     7.2-1       A free implementation of the OpenG
ii  libqtcore4                   4.5.0~rc1-2 Qt 4 core module
ii  libqtgui4                    4.5.0~rc1-2 Qt 4 GUI module
ii  libstdc++6                   4.3.3-3     The GNU Standard C++ Library v3
ii  libx11-6                     2:1.1.5-2   X11 client-side library

libqt4-opengl recommends no packages.

libqt4-opengl suggests no packages.

-- no debconf information

#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <error.h>

int
main(int argc, char** argv)
{
	if (argc < 2)
		error(EXIT_FAILURE, 0, "usage: %s LIBRARY...", argv[0]);

	void* handle[argc];
	int i;
	for (i=1; i < argc; i++)
	{
		printf("opening %s...\n", argv[i]);
		handle[i] = dlopen(argv[i], RTLD_LAZY);
		if (!handle[i])
			error(EXIT_FAILURE, 0, "dlopen: %s", dlerror());
	}

	for (i=argc-1; i > 0; i--)
	{
		printf("closing %s...\n", argv[i]);
		if(dlclose(handle[i]))
			error(EXIT_FAILURE, 0, "dlclose: %s", dlerror());
	}

	printf("done\n");
	exit(EXIT_SUCCESS);
}

--- End Message ---
--- Begin Message --- 
It works now; the problem was probably an old libgl1.

--- End Message ---
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