Same here on xubuntu.
szemy@szemy-desktop:~$ glxinfo name of display: :0.0 Locking assertion failure. Backtrace: #0 /usr/lib/libxcb-xlib.so.0 [0xb7705767] #1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_unlock+0x31) [0xb77058b1] #2 /usr/lib/libX11.so.6(_XReply+0xfd) [0xb78911bd] #3 /usr/lib/libGL.so.1 [0xb7d5e22b] #4 /usr/lib/libGL.so.1 [0xb7d5d87a] Locking assertion failure. Backtrace: #0 /usr/lib/libxcb-xlib.so.0 [0xb7705767] #1 /usr/lib/libxcb-xlib.so.0(xcb_xlib_lock+0x2e) [0xb770581e] #2 /usr/lib/libX11.so.6 [0xb7890518] #3 /usr/lib/libX11.so.6(XGetVisualInfo+0x26) [0xb78870a6] #4 /usr/lib/libGL.so.1 [0xb7d5ddb1] glxinfo: ../../src/xcb_lock.c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed. Aborted
Same here on xubuntu.
szemy@szemy- desktop: ~$ glxinfo libxcb- xlib.so. 0 [0xb7705767] libxcb- xlib.so. 0(xcb_xlib_ unlock+ 0x31) [0xb77058b1] libX11. so.6(_XReply+ 0xfd) [0xb78911bd] libxcb- xlib.so. 0 [0xb7705767] libxcb- xlib.so. 0(xcb_xlib_ lock+0x2e) [0xb770581e] libX11. so.6 [0xb7890518] libX11. so.6(XGetVisual Info+0x26) [0xb78870a6] xcb_lock. c:77: _XGetXCBBuffer: Assertion `((int) ((xcb_req) - (dpy->request)) >= 0)' failed.
name of display: :0.0
Locking assertion failure. Backtrace:
#0 /usr/lib/
#1 /usr/lib/
#2 /usr/lib/
#3 /usr/lib/libGL.so.1 [0xb7d5e22b]
#4 /usr/lib/libGL.so.1 [0xb7d5d87a]
Locking assertion failure. Backtrace:
#0 /usr/lib/
#1 /usr/lib/
#2 /usr/lib/
#3 /usr/lib/
#4 /usr/lib/libGL.so.1 [0xb7d5ddb1]
glxinfo: ../../src/
Aborted