[Xcb] xcblock.c Assertion

Jamey Sharp jamey at minilop.net
Wed Sep 13 01:24:01 PDT 2006

Thanks for the note, Paul. It'd help if you could try a few things.

1. Retest with current libX11 master to make sure the bug is still
there. (It probably is, but I did just change stuff this evening...)

2. Pick an application that triggers the bug -- gaim or xchat would
probably be OK, but firefox not so much -- and run it under gdb.

$ gdb gaim
(gdb) run
Starting program: /usr/bin/gaim

When it fails, run 'bt' to get a stack trace. Attach the complete log of
the session, including the line that says something like 'This GDB was
configured as "i486-linux-gnu"...', to a list message or a new Bugzilla
bug report at https://bugs.freedesktop.org.

Hopefully with that information we can get started diagnosing the

Thanks again for letting us know,


> ---------- Forwarded message ----------
> Date: Mon, 11 Sep 2006 11:27:17 -0400
> From: Paul Moss <moss.paul at gmail.com>
> To: xorg at lists.freedesktop.org
> Subject: xcblock.c Assertion
> I just upgraded to Xorg -current and I had a problem running
> some programs.  Firefox, most notably, also gaim, xchat (I think all
> gtk apps) crash on load with this error:
> xcl/xcblock.c:128: _XGetXCBBuffer: Assertion `((int) ((xcb_req) -
> (dpy->request)) >=0)' failed.
> I am not sure how to get more information for that particular error.
> It has happened in both fluxbox and enlightenment.  And I have seen it
> with more than 1 program, so I assume that it is related to my recent
> upgrade of X.
> I rolled back from the master branch in the git repos for the
> lib/libX11 package to the 'stable' branch and recompiled.  Everything
> appears to be working fine now.  Anyway, I just thought you all might
> want to know.  Apologies if it was just something stupid I was doing.
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