On Monday, November 23, 2009, at 04:08PM, "Erik van Blokland" <e...@letterror.com> wrote: >Hi all, > >I'm hesitant to write this mail, but after a day of fruitless debugging, I >need a reality check. OSX 10.6.2, stock Python 2.6.1 (r261:67515, Jul 7 2009, >23:51:51). > >At the center is a python object intended to generate a bitmap image. It uses >CGBitmapContextCreate to make a new context, does some drawing and returns the >image. All drawing, rendering works, all tests pass when running the script as >a one-off test. >But when I use the same object as part of a twisted.web internet.TCPServer, I >get a hard crash when calling CGBitmapContextCreate, (report attached below). >The twisted.web process itself runs well, I can access its pages and all >(html) data is rendered properly. Only when I ask for the image the process >pops the lid and is killed. > >According to > > http://developer.apple.com/mac/library/DOCUMENTATION/GraphicsImaging/Reference/CGBitmapContext/Reference/reference.html >CGBitmapContextCreate asks for a chunk of memory where it can draw. When >testing offline, passing None works, numpy and array.arrays also work. But >none of the options prevent crashing in the online version. > >I can't see what goes on inside CGBitmapContextCreate and I don't have >experience reading these crash reports. Looks like a memory thing no? Any >pointers would be very welcome.
Crash reports tend to be pretty useless to find out what's really going on, especially with memory management issue. Do you have a simple example that shows of the bug? I really need that to debug when the issue does not occur in a basic command-line script. Ronald _______________________________________________ Pythonmac-SIG maillist - Pythonmac-SIG@python.org http://mail.python.org/mailman/listinfo/pythonmac-sig
