Strange crash issue on Windows w/ PyGTK, Cairo...

CJ Kucera pez at apocalyptech.com
Thu Mar 19 18:18:48 CET 2009


CJ Kucera wrote:
> Anyway, the issue turned out to be zlib.decompress() - for larger sets
> of data, if I wasn't specifying "bufsize," the malloc()s that it was
> doing behind-the-scenes must have been clobbering memory.  As soon as I
> specified bufsize, everything was totally kosher.

Okay, I've got a reproducible testcase of this available up here:

http://apocalyptech.com/pygtk-zlib/

I'm no longer *totally* convinced that it's a zlib issue...  zlib's call
actually returns a valid string, and the error happens later in the app.
I've yet to be able to engineer a crash using anything other than that
cairo.ImageSurface.create_from_png() function, so it's possible that
specifying "bufsize" in zlib.decompress() merely allocates memory in
such a way that a bug in PyCairo doesn't come to light in that case.

So, I'm not really sure if I should submit this to Python or PyGTK's
tracker yet.  Could someone check it out and let me know what you think?
That'd be great.  Thanks!

As I mention on that page, removing "import os" and "import sys" will
"fix" the issue on XP, though you can remove them on win2k and still see
the crash.

Thanks,
CJ

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