#0  0x0012d422 in __kernel_vsyscall ()
#1  0x031ccaf9 in __lll_lock_wait () from /lib/tls/i686/cmov/libpthread.so.0
#2  0x031c813b in _L_lock_748 () from /lib/tls/i686/cmov/libpthread.so.0
#3  0x031c7f61 in pthread_mutex_lock () from /lib/tls/i686/cmov/libpthread.so.0
#4  0x0310fba6 in pthread_mutex_lock () from /lib/tls/i686/cmov/libc.so.6
#5  0x0292f41f in _XLockMutex (lip=0x2a25e34) at ../../src/locking.c:107
#6  0x034729af in XextFindDisplay (extinfo=0x0, dpy=0x84debb0) at ../../src/extutil.c:232
#7  0x0344faff in DRI2FindDisplay (dpy=0x84debf0) at dri2.c:81
#8  0x0344fd6e in DRI2QueryExtension (dpy=0x84debf0, eventBase=0xbfffd9cc, errorBase=0xbfffd9c8) at dri2.c:184
#9  0x0344e653 in dri2CreateDisplay (dpy=0x84debf0) at dri2_glx.c:900
#10 0x0342a6ce in __glXInitialize (dpy=0x84debf0) at glxext.c:848
#11 0x0342764a in GetGLXPrivScreenConfig (dpy=0x84debf0, scrn=0, ppriv=0xbfffdbdc, ppsc=0xbfffdbd8) at glxcmds.c:183
#12 0x03427d46 in glXChooseVisual (dpy=0x84debf0, screen=0, attribList=0xbfffdcd8) at glxcmds.c:1495
#13 0x032dae3f in PsychOSOpenOnscreenWindow (screenSettings=0xbfffe114, windowRecord=0x8501010, numBuffers=2, stereomode=0, 
    conserveVRAM=0) at Linux/Screen/PsychWindowGlue.c:288
#14 0x032ee883 in PsychOpenOnscreenWindow (screenSettings=0xbfffe114, windowRecord=0xbfffe110, numBuffers=2, stereomode=0, 
    rect=0xbfffe1b0, multiSample=0, sharedContextWindow=0x0) at Common/Screen/PsychWindowSupport.c:295
#15 0x0330e57c in SCREENOpenWindow () at Common/Screen/SCREENOpenWindow.c:301
#16 0x0334b79b in mexFunction (nlhs=1, plhs=0xb5ee7018, nrhs=4, prhs=0xb5ee7008) at Common/Base/PsychScriptingGlue.cc:959
#17 0x004e0f25 in call_mex(bool, void*, octave_value_list const&, int, octave_mex_function*) ()
   from /usr/lib/octave-3.2.3/liboctinterp.so
#18 0x006f8868 in octave_mex_function::do_multi_index_op(int, octave_value_list const&) ()
   from /usr/lib/octave-3.2.3/liboctinterp.so