basbak2:/tmp# gdb /usr/bin/Xorg core
GNU gdb 6.8-debian
Copyright (C) 2008 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"...

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /lib/libdl.so.2...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /usr/lib/libXfont.so.1...done.
Loaded symbols for /usr/lib/libXfont.so.1
Reading symbols from /usr/lib/libXau.so.6...done.
Loaded symbols for /usr/lib/libXau.so.6
Reading symbols from /usr/lib/libfontenc.so.1...done.
Loaded symbols for /usr/lib/libfontenc.so.1
Reading symbols from /usr/lib/libpixman-1.so.0...done.
Loaded symbols for /usr/lib/libpixman-1.so.0
Reading symbols from /usr/lib/libhal.so.1...done.
Loaded symbols for /usr/lib/libhal.so.1
Reading symbols from /usr/lib/libdbus-1.so.3...done.
Loaded symbols for /usr/lib/libdbus-1.so.3
Reading symbols from /usr/lib/libXdmcp.so.6...done.
Loaded symbols for /usr/lib/libXdmcp.so.6
Reading symbols from /lib/libm.so.6...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/librt.so.1...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /usr/lib/libfreetype.so.6...done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /usr/lib/libz.so.1...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /usr/lib/xorg/modules/libpcidata.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libpcidata.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules//libpcidata.so
Reading symbols from /usr/lib/xorg/modules/extensions/libextmod.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libextmod.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libextmod.so
Reading symbols from /usr/lib/xorg/modules/extensions/libdbe.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libdbe.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libdbe.so
Reading symbols from /usr/lib/xorg/modules/extensions/libglx.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libglx.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libglx.so
Reading symbols from /usr/lib/xorg/modules/fonts/libfreetype.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/fonts/libfreetype.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules//fonts/libfreetype.so
Reading symbols from /usr/lib/xorg/modules/extensions/librecord.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/librecord.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules/extensions//librecord.so
Reading symbols from /usr/lib/xorg/modules/extensions/libdri.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/extensions/libdri.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libdri.so
Reading symbols from /usr/lib/libdrm.so.2...done.
Loaded symbols for /usr/lib/libdrm.so.2
Reading symbols from /usr/lib/xorg/modules/drivers/intel_drv.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/drivers/intel_drv.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules/drivers//intel_drv.so
Reading symbols from /usr/lib/xorg/modules/input/mouse_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input//mouse_drv.so
Reading symbols from /usr/lib/xorg/modules/input/kbd_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input//kbd_drv.so
Reading symbols from /usr/lib/xorg/modules/libint10.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libint10.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules//libint10.so
Reading symbols from /usr/lib/xorg/modules/libvbe.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libvbe.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules//libvbe.so
Reading symbols from /usr/lib/xorg/modules/libvgahw.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libvgahw.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules//libvgahw.so
Reading symbols from /usr/lib/xorg/modules/libfb.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libfb.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules//libfb.so
Reading symbols from /usr/lib/xorg/modules/libxaa.so...Reading symbols from /usr/lib/debug/usr/lib/xorg/modules/libxaa.so...done.
done.
Loaded symbols for /usr/lib/xorg/modules//libxaa.so
Reading symbols from /lib/libgcc_s.so.1...done.
Loaded symbols for /lib/libgcc_s.so.1
Core was generated by `X'.
Program terminated with signal 6, Aborted.
[New process 3995]
#0  0x00002b7d7216b165 in raise () from /lib/libc.so.6
(gdb) bt
#0  0x00002b7d7216b165 in raise () from /lib/libc.so.6
#1  0x00002b7d7216c610 in abort () from /lib/libc.so.6
#2  0x0000000000467e63 in ddxGiveUp ()
    at ../../../../hw/xfree86/common/xf86Init.c:1073
#3  0x000000000056ac08 in AbortServer () at ../../os/log.c:406
#4  0x000000000056b255 in FatalError (
    f=0x573ca8 "Caught signal %d.  Server aborting\n") at ../../os/log.c:552
#5  0x00000000004758d9 in xf86SigHandler (signo=11)
    at ../../../../hw/xfree86/common/xf86Events.c:766
#6  <signal handler called>
#7  0x00000000004b45c3 in xf86CrtcRotate (crtc=0x804c60, mode=0x804d40, 
    rotation=<value optimized out>)
    at ../../../../hw/xfree86/modes/xf86Rotate.c:628
#8  0x00000000004aece3 in xf86CrtcSetMode (crtc=0x804c60, mode=0x804d40, 
    rotation=0, x=1280, y=0) at ../../../../hw/xfree86/modes/xf86Crtc.c:283
#9  0x00000000004af17b in xf86SetDesiredModes (scrn=0x800a70)
    at ../../../../hw/xfree86/modes/xf86Crtc.c:1786
#10 0x00002b7d73bf2215 in I830EnterVT (scrnIndex=0, 
    flags=<value optimized out>) at ../../src/i830_driver.c:3292
#11 0x00002b7d73bf3503 in I830ScreenInit (scrnIndex=0, pScreen=0x834c60, 
    argc=<value optimized out>, argv=<value optimized out>)
    at ../../src/i830_driver.c:3042
#12 0x0000000000436198 in AddScreen (pfnInit=0x2b7d73bf2480 <I830ScreenInit>, 
    argc=1, argv=0x7fff3a114e68) at ../../dix/main.c:769
---Type <return> to continue, or q <return> to quit---
#13 0x00000000004685b6 in InitOutput (pScreenInfo=0x7e6e60, argc=1, 
    argv=0x7fff3a114e68) at ../../../../hw/xfree86/common/xf86Init.c:850
#14 0x000000000043694f in main (argc=1, argv=0x7fff3a114e68, 
    envp=0x7fff3a114e78) at ../../dix/main.c:369
(gdb) quit