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Bug 607280 - Fix crashes in desktop-effects
Summary: Fix crashes in desktop-effects
Keywords:
Status: CLOSED CURRENTRELEASE
Alias: None
Product: Red Hat Enterprise Linux 6
Classification: Red Hat
Component: desktop-effects
Version: 6.0
Hardware: All
OS: Linux
low
medium
Target Milestone: rc
: ---
Assignee: Owen Taylor
QA Contact: desktop-bugs@redhat.com
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2010-06-23 17:07 UTC by Owen Taylor
Modified: 2010-11-10 20:07 UTC (History)
3 users (show)

Fixed In Version: desktop-effects-0.8.4-6.el6
Doc Type: Bug Fix
Doc Text:
Clone Of:
Environment:
Last Closed: 2010-11-10 20:07:31 UTC
Target Upstream Version:
Embargoed:

Attachments (Terms of Use)

Description Owen Taylor 2010-06-23 17:07:53 UTC 
There are several crashes reported during OpenGL detection in desktop-effects that have easy, safe fixes:

 Bug 533807 - Crash in glXDestroyContext
 http://git.fedorahosted.org/git/?p=desktop-effects.git;a=commit;h=1e96aac70b3290a954fa29196a4dbf93f2c3578a
 Bug 574500 - BadMatch from XCreateWindow
 http://git.fedorahosted.org/git/?p=desktop-effects.git;a=commit;h=d822283c5bc0e8a6bc24bff8fab6c78f319b6b50

The second one is especially common and occurs any time you run desktop-effects after configuring 16bpp graphics. We should pull these fixes in for RHEL6.
Comment 6 Owen Taylor 2010-07-13 17:04:19 UTC 
Having tried it, I don't think it makes sense to try and reproduce in gdb. The poor handling of optimized code in gdb makes it really confusing and unpredictable, and any instructions I could give would reproduce it both with and without the fix.

Because the same instructions that initialize an uninitialized variable to a junk value will also reinitialize an initialized variable to a junk value.

However, it was really good you asked for this, since in investigating, I found that the patch was not correctly included in the RPM!

Will build a better version immediately.
Comment 7 Owen Taylor 2010-07-13 17:30:42 UTC 
Version with the relevant patch actually applied is now built.
Comment 9 Owen Taylor 2010-07-13 18:08:45 UTC 
It would be good to test that desktop-effects properly works if mesa-dri-drivers is removed (with rpm -e --nodeps if necessary.) It should display a message on startup that GL is not available.

That will test the code path that was changed.

But there's nothing I can suggest that will give before/after verification that it crashes with the old packages and not with the new packages.
Comment 10 Lubos Kocman 2010-07-15 08:36:13 UTC 
Verified (according to Comment 9) on:

desktop-effects-0.8.4-6.el6


Getting (after removing mesa-dri-drivers and logout):

Accelerated 3D graphics is not available
Desktop effects require hardware 3D support.
Comment 11 releng-rhel@redhat.com 2010-11-10 20:07:31 UTC 
Red Hat Enterprise Linux 6.0 is now available and should resolve
the problem described in this bug report. This report is therefore being closed
with a resolution of CURRENTRELEASE. You may reopen this bug report if the
solution does not work for you.
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