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[Qays Poonawala <qayshp@xxxxxxxxx>]

gdb backtrace from crash, sorry for lack of symbol tables:

GNU gdb (GDB) 7.1-ubuntu
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This GDB was configured as "x86_64-linux-gnu".
For bug reporting instructions, please see:
<http://www.gnu.org/software/gdb/bugs/>...
Reading symbols from /usr/bin/Xorg...(no debugging symbols found)...done.
(gdb) attach 3699
Attaching to program: /usr/bin/Xorg, process 3699
Reading symbols from /lib/libudev.so.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libudev.so.0
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/libdl.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdl.so.2
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/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/libpixman-1.so.0...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libpixman-1.so.0
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/libgcrypt.so.11...(no debugging symbols found)...done.
Loaded symbols for /lib/libgcrypt.so.11
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/libz.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libz.so.1
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
Reading symbols from /usr/lib/libfreetype.so.6...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /lib/libbz2.so.1.0...(no debugging symbols found)...done.
Loaded symbols for /lib/libbz2.so.1.0
Reading symbols from /usr/lib/libfontenc.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/libfontenc.so.1
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/libgcc_s.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libgcc_s.so.1
Reading symbols from /usr/lib/xorg/modules/extensions/libdbe.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libdbe.so
Reading symbols from /usr/lib/xorg/modules/extensions/libextmod.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libextmod.so
Reading symbols from /usr/lib/xorg/extra-modules/libglx.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/extra-modules/libglx.so
Reading symbols from /usr/lib/nvidia-current/libGLcore.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/nvidia-current/libGLcore.so.1
Reading symbols from /usr/lib/nvidia-current/tls/libnvidia-tls.so.1...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/nvidia-current/tls/libnvidia-tls.so.1
Reading symbols from /usr/lib/xorg/modules/extensions/librecord.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/librecord.so
Reading symbols from /usr/lib/xorg/modules/extensions/libdri.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libdri.so
Reading symbols from /lib/libdrm.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libdrm.so.2
Reading symbols from /usr/lib/xorg/modules/extensions/libdri2.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/extensions/libdri2.so
Reading symbols from /usr/lib/xorg/extra-modules/nvidia_drv.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/extra-modules/nvidia_drv.so
Reading symbols from /usr/lib/xorg/modules/libfb.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/libfb.so
Reading symbols from /usr/lib/xorg/modules/libwfb.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/libwfb.so
Reading symbols from /usr/lib/xorg/modules/input/evdev_drv.so...(no debugging symbols found)...done.
Loaded symbols for /usr/lib/xorg/modules/input/evdev_drv.so
Reading symbols from /lib/libnss_compat.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libnss_compat.so.2
Reading symbols from /lib/libnsl.so.1...(no debugging symbols found)...done.
Loaded symbols for /lib/libnsl.so.1
Reading symbols from /lib/libnss_nis.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libnss_nis.so.2
Reading symbols from /lib/libnss_files.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libnss_files.so.2
0x00007fc65131ffd3 in select () from /lib/libc.so.6
(gdb) cont
Continuing.

Program received signal SIGPIPE, Broken pipe.
0x00007fc65131f5f1 in writev () from /lib/libc.so.6
(gdb) backltrace full
#0  0x00007fc65131f5f1 in writev () from /lib/libc.so.6
No symbol table info available.
#1  0x00000000004682ac in ?? ()
No symbol table info available.
#2  0x0000000000463b5d in ?? ()
No symbol table info available.
#3  0x0000000000464689 in FlushAllOutput ()
No symbol table info available.
#4  0x0000000000430a65 in ?? ()
No symbol table info available.
#5  0x000000000042613a in _start ()
No symbol table info available.
(gdb) cont
Continuing.

Program received signal SIGPIPE, Broken pipe.
0x00007fc65131f5f1 in writev () from /lib/libc.so.6
(gdb) q
A debugging session is active.

        Inferior 1 [process 3699] will be detached.

Quit anyway? (y or n) Detaching from program: /usr/bin/Xorg, process
3699

-- 
Xorg crash with SIGPIPE after successful login
https://bugs.launchpad.net/bugs/546525
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