root@abc-HP:/home/abc/wayland# gdb $WLD/bin/Xorg
GNU gdb (Ubuntu/Linaro 7.4-2012.04-0ubuntu2.1) 7.4-2012.04
Copyright (C) 2012 Free Software Foundation, Inc.
License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.  Type "show copying"
and "show warranty" for details.
This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://bugs.launchpad.net/gdb-linaro/>...
Reading symbols from /home/abc/WAYLANDINSTALLDIR/bin/Xorg...done.
(gdb) attach 19458
Attaching to program: /home/abc/WAYLANDINSTALLDIR/bin/Xorg, process 19458
Reading symbols from /lib64/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
0x00007fe41ef5d820 in ?? ()
(gdb) c
Continuing.
process 19458 is executing new program: /home/abc/WAYLANDINSTALLDIR/bin/Xorg
[Thread debugging using libthread_db enabled]
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".

Program received signal SIGSEGV, Segmentation fault.
wl_proxy_create (factory=0x0, interface=0x7feb89670c60) at wayland-client.c:215
215		struct wl_display *display = factory->display;
(gdb) bt
#0  wl_proxy_create (factory=0x0, interface=0x7feb89670c60) at wayland-client.c:215
#1  0x00007feb8946d662 in wl_registry_bind (wl_registry=0x0, name=11, interface=0x7feb89670c60, version=1)
    at /home/abc/WAYLANDINSTALLDIR/include/wayland-client-protocol.h:286
#2  0x00007feb8946d87f in drm_handler (data=0x22960b0, registry=0x228e5b0, id=11, interface=0x229b6e0 "wl_drm", version=1) at xwayland-drm.c:84
#3  0x00007feb89057a14 in ffi_call_unix64 () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#4  0x00007feb89057435 in ffi_call () from /usr/lib/x86_64-linux-gnu/libffi.so.6
#5  0x00007feb89260fdf in wl_closure_invoke (closure=<optimized out>, target=0x228e5b0, func=<optimized out>, data=0x22960b0) at connection.c:908
#6  0x00007feb8925e88c in dispatch_event (display=0x22961b0, queue=<optimized out>) at wayland-client.c:839
#7  dispatch_queue (display=0x22961b0, queue=0x2296238, block=<optimized out>) at wayland-client.c:893
#8  0x00007feb8925f57c in wl_display_roundtrip (display=0x22961b0) at wayland-client.c:653
#9  0x00007feb8946d8f3 in xwl_drm_pre_init (xwl_screen=0x22960b0) at xwayland-drm.c:104
#10 0x00007feb88e30234 in NVPciProbe (drv=<optimized out>, entity_num=0, pci_dev=0x2273100, match_data=<optimized out>) at nv_driver.c:245
#11 0x00000000004a8901 in xf86PciProbeDev (drvp=0x2295e50) at xf86pciBus.c:535
#12 0x000000000047eedd in xf86CallDriverProbe (drv=0x2295e50, detect_only=0) at xf86Bus.c:88
#13 0x000000000047effe in xf86BusConfig () at xf86Bus.c:133
#14 0x000000000048be43 in InitOutput (pScreenInfo=0x861d00, argc=8, argv=0x7fffe620ea88) at xf86Init.c:558
#15 0x0000000000420e61 in main (argc=8, argv=0x7fffe620ea88, envp=0x7fffe620ead0) at main.c:203