Bug 18632

Summary:	failed assertion `CAIRO_REFERENCE_COUNT_HAS_REFERENCE (&pattern->ref_count)' when using cairo quartz backend
Product:	cairo	Reporter:	Paolo Bonzini <bonzini>
Component:	quartz backend	Assignee:	Vladimir Vukicevic <vladimir>
Status:	RESOLVED FIXED	QA Contact:	cairo-bugs mailing list <cairo-bugs>
Severity:	major
Priority:	medium	CC:	askok
Version:	1.9.1
Hardware:	PowerPC
OS:	Mac OS X (All)
URL:	https://bugs.freedesktop.org/attachment.cgi?id=16307
Whiteboard:
i915 platform:		i915 features:

Description Paolo Bonzini 2008-11-20 04:22:03 UTC

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 */

to test).

Comment 1 Asko Kauppi 2008-12-09 02:12:24 UTC

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):

   http://akauppi.googlepages.com/TX-20081127.tgz
   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):

$ 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.

Comment 2 Paolo Bonzini 2008-12-09 06:48:31 UTC

See http://permalink.gmane.org/gmane.comp.lib.cairo/15727 for analysis and patches.

Comment 3 Paolo Bonzini 2008-12-09 06:49:48 UTC

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).

Comment 4 Chris Wilson 2008-12-14 05:10:49 UTC

(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 
d93bf10edc7e432349524221a3d1b0f0b2ec8090.

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