Trying to reproduce bug 15797 with current git (63a86a470f) I found that the bug is not anymore reproducible because cairo crashes earlier with an assertion failure.
The program is at https://bugs.freedesktop.org/attachment.cgi?id=16307
It works correctly with an image surface (try uncommenting this line:
/* #undef CAIRO_HAS_QUARTZ_SURFACE */
I can reproduce this bug on any of the systems (OS X PowerPC/Intel, Linux x86, Windows XP).
It is a statistical bug, happening randomly. To repeat:
1. Get "TexasFlag" project from Google pages or subversion (recommended):
svn co svn://slugak.dyndns.org/public/2009/TX
2. "make run"
4. There should be a Texas flag drawn in a GUI window.
5. Start resizing the window by dragging from its corner. Within a second or so, you'd get a crash.
On OS X, it may be beneficial to start the utility like (gives you the console log):
Assertion failed: (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&cr->ref_count)), function cairo_destroy, file cairo.c, line 218.
Running Cairo 1.8.4 on all the systems.
See http://permalink.gmane.org/gmane.comp.lib.cairo/15727 for analysis and patches.
Asko's failure is not related to this bug (this bug is for a failure in cairo-quartz-surface.c with the example program in the attachment).
(In reply to comment #1)
> $ TexasFlag.app/Contents/MacOS/TexasFlag
> Assertion failed: (CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&cr->ref_count)),
> function cairo_destroy, file cairo.c, line 218.
> Running Cairo 1.8.4 on all the systems.
This is most likely to be an application bug - if you can reproduce this with a minimal test case please open a new bug.
Jeff Muizelaar fixed the invalid referencing of the uncopied pattern, the original bug, with commit