As reported here: http://bugzilla.gnome.org/show_bug.cgi?id=111349 and hete: http://bugzilla.gnome.org/show_bug.cgi?id=111880 and finally here: http://bugs.xfree86.org/show_bug.cgi?id=260 Looks like this got inherited from XFree as it still happens on the latest xorg release. (6.8.0) Potentially related: http://freedesktop.org/bugzilla/show_bug.cgi?id=555 So it looks like something between XInitThreads and the pthread lib.
Since the reporter mentions Xorg 6.8.0, assuming they really meant to file this against Xorg and moving to that bug category. (Xlibs is a separate project.)
Sorry about the phenomenal bug spam, guys. Adding xorg-team@ to the QA contact so bugs don't get lost in future.
*** This bug has been marked as a duplicate of bug 5424 ***
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