Re: [XenAccess-devel] Segmentation fault when calling the same function twice

[Bryan D. P. <br...@th...>]

> One final point: I'm trying to use Xenaccess under
> Python using ctypes library (it allows to load a C
> library and call it from Python).

A little disclaimer, I'm not very familiar with the ctypes  
library :-)  So my thoughts below could be very wrong...


> I've traced back the problem to the function
> "linux_get_kernel_name": in fact, simply commenting
> the last line before the return statement ("if
> (xml_data) free(xml_data);"), fixed the problem, but
> it's a brutal fix: in fact, if between the two calls a

This sounds a lot like a memory corruption issue.  The thing is, I'm  
not seeing where the corruption would be occurring by looking at the  
XenAccess code.  One guess would be if python had a bad  
implementation of one of these libc functions.  But that would be  
surprising to me.

Have you been able to reproduce this problem without the python  
ctypes library?

-bryan


-
Bryan D. Payne
Graduate Student, Computer Science
Georgia Tech Information Security Center
http://www.bryanpayne.org