Re: [xml] XPath - crashing using xmlXPathCompiledEval (problem within xmlXPathCtxtCompile?) - long

On Mon, Nov 19, 2007 at 02:15:37PM +1100, Andrew Nelson wrote:
Dear List,
I am using the latest version of libxml2  (2.6.30) to provide XML  
support for a program called IGOR Pro on Win32 + MacOSX.  This  
project takes the form of a C plugin.

 Replying to this very old mail...

-I compiled the libxml2 source myself.
-My test XML file is:
<?xml version="1.0"?>

-the code fragment I have in my plugin is listed below.  When we get  
to this stage doc is a valid xmlDocPtr, and xpathExpr = BAD_CAST ("/ 
If I run this fragment on the console it works fine.  However, it  
crashes everytime in my plugin. The stacktrace is

0   libxml2.2.dylib                   0x17ba9561 xmlPatternMaxDepth +  
111 (pattern.c:2545)
1   libxml2.2.dylib                   0x17b0d261 xmlXPathRunStreamEval  
+ 69 (xpath.c:14043)
2   libxml2.2.dylib                   0x17b0d823 xmlXPathRunEval + 296  
3   libxml2.2.dylib                   0x17b0e281  
xmlXPathCompiledEvalInternal + 233 (xpath.c:14681)
4   libxml2.2.dylib                   0x17b0e3d2 xmlXPathCompiledEval +  
46 (xpath.c:14745)
5    0x179e5186  
execute_xpath_expression(_xmlDoc*, unsigned char*, unsigned char*,  
int*) + 180 (XMLevaluateXPathExpression.cpp:126)

I investigated the cause of the crash and it appears that in  
xmlPatternMaxDepth(pattern.c:2545) the pointer comp->stream is  

  Are you sure when running in your plugin environment you are not
linking to a *different* libxml2 shared library with different options
compiled in ? This sounds the most probable source of the problem.


Red Hat Virtualization group
Daniel Veillard      | virtualization library
veillard redhat com  | libxml GNOME XML XSLT toolkit | Rpmfind RPM search engine

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