(gdb) bt
#0  0x08184b80 in XkbEnableDisableControls (xkbi=0x85f6b00, change=542, newValues=512, changes=0x0, cause=0xbfbfe3a0) at xkbUtils.c:748
#1  0x081897ca in XkbRemoveResourceClient (inDev=0x85f6200, id=1101004800) at xkbEvents.c:1014
#2  0x0807c882 in CloseDevice (dev=0x85f6200) at devices.c:602
#3  0x0807c958 in CloseDownDevices () at devices.c:624
#4  0x081b6493 in AbortServer () at log.c:405
#5  0x081b6794 in FatalError (f=0x0) at log.c:552
#6  0x080c0ed4 in xf86SigHandler (signo=11) at xf86Events.c:764
#7  0x28494208 in sigaction () from /lib/libpthread.so.2
#8  0xbfbfffb4 in ?? ()
#9  0x0000000b in ?? ()
#10 0xbfbfe7f0 in ?? ()
#11 0xbfbfe530 in ?? ()
#12 0x00000000 in ?? ()
#13 0x28493870 in sigaction () from /lib/libpthread.so.2
#14 0x307fb52d in _mesa_Viewport (x=0, y=0, width=0, height=0) at matrix.c:556
#15 0x2864abad in __glXDisp_Viewport (pc=0x21e <Error reading address 0x21e: Bad address>) at indirect_dispatch.c:2704
#16 0x28641849 in DoRender (cl=0x85f6b00, pc=0x97a9008 "\024", do_swap=0) at glxcmds.c:1851
#17 0x2864197a in __glXDisp_Render (cl=0x0, pc=0x0) at glxcmds.c:1865
#18 0x28644938 in __glXDispatch (client=0x902c600) at glxext.c:561
#19 0x0814656d in XaceCatchExtProc (client=0x902c600) at xace.c:299
#20 0x08087024 in Dispatch () at dispatch.c:502
#21 0x0806df1c in main (argc=7, argv=0xbfbfeebc, envp=0x0) at main.c:452
(gdb) frame 0
#0  0x08184b80 in XkbEnableDisableControls (xkbi=0x85f6b00, change=542, newValues=512, changes=0x0, cause=0xbfbfe3a0) at xkbUtils.c:748
748         ctrls= xkbi->desc->ctrls;
(gdb) l
743     {
744     XkbControlsPtr          ctrls;
745     unsigned                old;
746     XkbSrvLedInfoPtr        sli;
747
748         ctrls= xkbi->desc->ctrls;
749         old= ctrls->enabled_ctrls;
750         ctrls->enabled_ctrls&= ~change;
751         ctrls->enabled_ctrls|= (change&newValues);
752         if (old==ctrls->enabled_ctrls)
(gdb) print xkbi
$1 = 0x85f6b00
(gdb) print xkbi->desc
$2 = 0x0


Program received signal SIGSEGV, Segmentation fault.
_mesa_set_viewport (ctx=0x888f000, x=0, y=0, width=0, height=1378) at matrix.c:597
597        _math_matrix_viewport(&ctx->Viewport._WindowMap,
(gdb) bt
#0  _mesa_set_viewport (ctx=0x888f000, x=0, y=0, width=0, height=1378) at matrix.c:597
#1  0x307fb52d in _mesa_Viewport (x=0, y=0, width=0, height=0) at matrix.c:556
#2  0x2864abad in __glXDisp_Viewport (pc=0x562 <Error reading address 0x562: Bad address>) at indirect_dispatch.c:2704
#3  0x28641849 in DoRender (cl=0x0, pc=0x8772008 "\024", do_swap=0) at glxcmds.c:1851
#4  0x2864197a in __glXDisp_Render (cl=0x0, pc=0x0) at glxcmds.c:1865
#5  0x28644938 in __glXDispatch (client=0x8854e00) at glxext.c:561
#6  0x0814656d in XaceCatchExtProc (client=0x8854e00) at xace.c:299
#7  0x08087024 in Dispatch () at dispatch.c:502
#8  0x0806df1c in main (argc=7, argv=0xbfbfeebc, envp=0x0) at main.c:452
(gdb) frame 0
#0  _mesa_set_viewport (ctx=0x888f000, x=0, y=0, width=0, height=1378) at matrix.c:597
597        _math_matrix_viewport(&ctx->Viewport._WindowMap,
(gdb) l
592     #if 1
593        /* XXX remove this someday.  Currently the DRI drivers rely on
594         * the WindowMap matrix being up to date in the driver's Viewport
595         * and DepthRange functions.
596         */
597        _math_matrix_viewport(&ctx->Viewport._WindowMap,
598                              ctx->Viewport.X, ctx->Viewport.Y,
599                              ctx->Viewport.Width, ctx->Viewport.Height,
600                              ctx->Viewport.Near, ctx->Viewport.Far,
601                              ctx->DrawBuffer->_DepthMaxF);
(gdb) print ctx
$1 = (GLcontext *) 0x888f000
(gdb) print ctx->DrawBuffer
$9 = (GLframebuffer *) 0x0