KDE malloc SIGSEGV with PerlQt bindings + KDE themes

[Karol Szwed]

On Tuesday 19 November 2002 13:27, Germain Garand wrote:
> Hi,
> I'm investigating a segfault that happens when using some KDE themes (namely : 
> riscos, marble, system, systemalt).
> It happens consistently when KDE's malloc attempts to free 
> KStandardDirs::addKDEDefaults's QStringList.
> 
> Would someone have a hint about what is going wrong ?

If the apps segfault on exit, it is most likely kthemestyle's linking to 
kdecore that is causing the problem (KStaticDeleter again most 
likely). You should not have any problems with all other style plugins
that do not link to kdecore. 

If you grep for "__GLIBC__" in kthemestyle.cpp you'll see a workaround:

dlopen("kthemestyle.so",RTLD_LAZY);

This helps to ensure that apps don't crash on exit by preventing 
the "dlclose" in Qt from having any effect on the plugin. This prevents 
the plugin from being unloaded and avoids the segfault. This is probably 
why valgrind is giving the all clear. Are you using libc on FreeBSD by 
any chance in which case this workaround isn't enabled?

Please give more info on your platform and exactly how to reproduce
the crash if its not on exit.

-- Karol