GNU gdb (GDB) 7.2
Copyright (C) 2010 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-unknown-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/Xorg...done.
Attaching to program: /usr/bin/Xorg, process 3738
Reading symbols from /lib/libudev.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libudev.so.0
Reading symbols from /lib/libgcrypt.so.11...(no debugging symbols found)...done.
Loaded symbols for /lib/libgcrypt.so.11
Reading symbols from /lib/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdl.so.2
Reading symbols from /usr/lib/libpciaccess.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpciaccess.so.0
Reading symbols from /lib/libpthread.so.0...(no debugging symbols found)...done.
[Thread debugging using libthread_db enabled]
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /usr/lib/libpixman-1.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpixman-1.so.0
Reading symbols from /usr/lib/libXfont.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXfont.so.1
Reading symbols from /usr/lib/libXau.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXau.so.6
Reading symbols from /usr/lib/libXdmcp.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libXdmcp.so.6
Reading symbols from /lib/libm.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libm.so.6
Reading symbols from /lib/librt.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/librt.so.1
Reading symbols from /lib/libc.so.6...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/libgpg-error.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libgpg-error.so.0
Reading symbols from /lib/ld-linux-x86-64.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/ld-linux-x86-64.so.2
Reading symbols from /usr/lib/libfreetype.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /usr/lib/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libz.so.1
Reading symbols from /usr/lib/libfontenc.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libfontenc.so.1
Reading symbols from /usr/lib/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libgcc_s.so.1
Reading symbols from /usr/lib/xorg/modules/extensions/libextmod.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libextmod.so
Reading symbols from /usr/lib/xorg/modules/extensions/libdbe.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libdbe.so
Reading symbols from /usr/lib/xorg/modules/extensions/libglx.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libglx.so
Reading symbols from /usr/lib/xorg/modules/extensions/librecord.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/librecord.so
Reading symbols from /usr/lib/xorg/modules/extensions/libdri.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libdri.so
Reading symbols from /usr/lib/libdrm.so.2...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdrm.so.2
Reading symbols from /usr/lib/xorg/modules/extensions/libdri2.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libdri2.so
Reading symbols from /usr/lib/xorg/modules/drivers/radeon_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/drivers/radeon_drv.so
Reading symbols from /usr/lib/libdrm_radeon.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libdrm_radeon.so.1
Reading symbols from /usr/lib/xorg/modules/libexa.so...done.
Loaded symbols for /usr/lib/xorg/modules/libexa.so
Reading symbols from /usr/lib/xorg/modules/libfb.so...done.
Loaded symbols for /usr/lib/xorg/modules/libfb.so
Reading symbols from /usr/lib/xorg/modules/dri/r600_dri.so...done.
Loaded symbols for /usr/lib/xorg/modules/dri/r600_dri.so
Reading symbols from /usr/lib/libexpat.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libexpat.so.1
Reading symbols from /usr/lib/libstdc++.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libstdc++.so.6
Reading symbols from /usr/lib/xorg/modules/input/evdev_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input/evdev_drv.so
Reading symbols from /usr/lib/xorg/modules/input/synaptics_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input/synaptics_drv.so
Reading symbols from /lib/libnss_files.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libnss_files.so.2
0x00007f4b469b0903 in select () from /lib/libc.so.6
[?1034h(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
0x00007f4b46959c94 in ?? () from /lib/libc.so.6
(gdb) bt full
#0  0x00007f4b46959c94 in ?? () from /lib/libc.so.6
No symbol table info available.
#1  0x00007f4b4695ac89 in ?? () from /lib/libc.so.6
No symbol table info available.
#2  0x00007f4b4695c479 in realloc () from /lib/libc.so.6
No symbol table info available.
#3  0x0000000000459c91 in ReadRequestFromClient (client=0x20aed80) at io.c:325
        ibuf = <value optimized out>
        oc = <value optimized out>
        oci = 0x2095710
        fd = 45
        gotnow = 2544
        needed = <value optimized out>
        result = <value optimized out>
        request = <value optimized out>
        need_header = <value optimized out>
        move_header = <value optimized out>
        __PRETTY_FUNCTION__ = "ReadRequestFromClient"
#4  0x00000000004505cd in Dispatch () at dispatch.c:412
        clientReady = 0x1f80290
        result = <value optimized out>
        client = 0x20aed80
        nready = -1
        icheck = 0x7e29f0
        start_tick = 520
#5  0x0000000000422abe in main (argc=9, argv=<value optimized out>, envp=<value optimized out>) at main.c:287
        i = <value optimized out>
        alwaysCheckForInput = {0, 1}
(gdb) quit
A debugging session is active.

	Inferior 1 [process 3738] will be detached.

Quit anyway? (y or n) Detaching from program: /usr/bin/Xorg, process 3738