[xml] Please Help - XMLNewDoc crashes

[Sven Weiberg <sven svenweiberg de>]

Hi!
I'm a Developer using libxml and get a crash(segmentation fault) calling 
xmlNewDoc. Here the information I could collect:
Source Code:

...
     xmlDocPtr xmlResultDoc;
...
     xmlResultDoc = xmlNewDoc((const xmlChar *)"1.0");
...

The Call Stack shows malloc() and mallopt() in libc.so as the following 
routines called. My libxml2 Version is 2.5.7 and my libc version is 
2.3.1. I'm using Debian Woody and just made an upgrade using the 
unstable tree.
I'm not (yet) very experienced in Linux Development,  so it's maybe a 
simple question, but I could really need some help.

Thanks
Sven Weiberg