this is confirmed by upstream :
02:19 < aaronp> tepsipakki: I reproduced the problem and filed bug 302927.
02:32 < aaronp> tepsipakki: It looks like what's happening is that XPending is
calling
XLockDisplay and then encounters an IO error, which calls exit,
and libGL
calls XESetCloseDisplay as part of its cleanup path.
** Changed in: linux-restricted-modules-2.6.20 (Ubuntu)
Importance: Undecided => Low
Status: Unconfirmed => Confirmed
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Closing glxgears window causes xcb_xlib_lock assertion and sound interruption
https://launchpad.net/bugs/91077
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