Hello, Some months ago, I migrated some part of our code from libxml2/libxslt modules to lxml module (which is much pythonic!). But my code never worked, because of a seg. fault :o( The crash occurs at: result = self.__xslFilter.apply(tree, {'filename':"'%s'" % baseName}) This code is used inside a Pyro server (Pyro is a client/server framework. see http://pyro.sourceforge.net), so in a multi-threaded environement. I ran the server using strace to see what happens: I got a ERESTARTNOHAND error. This error is very strange, and Google does not give usefull informations... I tested my code out of Pyro: it works. I made a simple Pyro serveur with just this part of the code: it works too. It only crashes when using the real server, which uses a lot of multi-threads calls. Another guy had a similar problem, but the error was in the python mysql client wrapper, only on stressed usage. It seems that there is a problem in either lxml and pymysql when used in a stressed multi-threaded way. I use locks in my server to avoid re-entrant calls to lxml, so I'm sure the problem is not there; I feel that it is related to the number of threads running... Does anyone has an idea of that problem? Thanks, PS: I also use lxml from mod_python, and all is working fine. -- Frédéric