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I installed Matlab R2007b on my super fast (well, the fastest I can afford) Athlo64 machine running OpenSuse 10.3 x86_64. I got this problem which prevented Matlab from starting. Matlab showed this error message:
MATLAB: xcb_xlib.c:52: xcb_xlib_unlock: Assertion `c->xlib.lock' failed
I found a work around to avoid this problem. Read on.
My Athlon64 computer runs openSuse 10.3 x86_64 with X.org 7.3. I get the following error when I launch Matlab R2007b (64 bit linux version).
MATLAB: xcb_xlib.c:52: xcb_xlib_unlock: Assertion `c->xlib.lock' failed
Apparently, this problem is due to a bug in Java AWT (which Matlab uses to render the GUI). Sun Java uses/calls some libraries that do not support XCB yet, which is used by X.org 7.2 (or 7.3??) by default. This error only happens with relatively new versions of X.org.
If I run Matlab in a command line mode (no GUI), this error does not happen.
This error can be avoided by adding the following environment variable:
LIBXCB_ALLOW_SLOPPY_LOCK=1
In openSuse, you can add the line
export LIBXCB_ALLOW_SLOPPY_LOCK=1
to your /etc/profile.local (create this file if it doesn't exist), and then refresh your environment variables by running
source /etc/profile
from the linux command line.
This workaround will help avoid this problem until Java (specifically, the JVM used by Matlab) adds XCB support.
Further information about this bug:
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