which version of libxcb do you have installed? The latest version (1.0-1.1ubuntu2) has a patch which should fix those assertion bugs (in fact, it only skips the locking test).
** Changed in: mesa (Ubuntu)
Status: Unconfirmed => Needs Info
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Closing glxgears window causes xcb_xlib_lock assertion and sound interruption
https://launchpad.net/bugs/91077
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