debug.txt

debug.txt (text/plain), 29.67 KB, created by Martin Mokrejš on 2009-03-11 17:29:18 UTC

mmokrejs  1098   974  0 17:15 pts/1    00:00:00 /bin/sh /usr/bin/startx
mmokrejs  1114  1098  0 17:15 pts/1    00:00:00 xinit /home/mmokrejs/.xinitrc -- -nolisten tcp -br -auth /home/mmokrejs/.serverauth.1098 -def
root      1115  1114 35 17:15 tty8     00:00:01 X :0 -nolisten tcp -br -auth /home/mmokrejs/.serverauth.1098 -deferglyphs 16
mmokrejs  1137  1114  0 17:15 pts/1    00:00:00 fvwm2
mmokrejs  1138  1137  0 17:15 pts/1    00:00:00 /usr/lib/fvwm/2.5.26/FvwmPager 7 4 none 0 8 0 2
mmokrejs  1139  1137  0 17:15 pts/1    00:00:00 xterm -fa +ls +mb -rw -aw -fn -misc-fixed-medium-r-normal-*-20-*-*-*-*-*-iso8859-2 -e bash


# gdb -p 1115
GNU gdb 6.8
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 "i686-pc-linux-gnu".
Attaching to process 1115
Reading symbols from /usr/bin/Xorg...done.
Reading symbols from /usr/lib/libpciaccess.so.0...done.
Loaded symbols for /usr/lib/libpciaccess.so.0
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/libfreetype.so.6...Reading symbols from /usr/lib/debug/usr/lib/libfreetype.so.6.3.19.debug...done.
done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /lib/libbz2.so.1...done.
Loaded symbols for /lib/libbz2.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 /lib/libz.so.1...done.
Loaded symbols for /lib/libz.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...Reading symbols from /usr/lib/debug/usr/lib/libdbus-1.so.3.4.0.debug...done.
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 /usr/lib/libcrypto.so.0.9.8...done.
Loaded symbols for /usr/lib/libcrypto.so.0.9.8
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 /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1...done.
Loaded symbols for /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libpthread.so.0...done.
[Thread debugging using libthread_db enabled]
[New Thread 0xb7a40a40 (LWP 1115)]
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /usr/lib/xorg/modules/extensions/libxtrap.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libxtrap.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/libdri.so...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/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/librecord.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//librecord.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/xorg/modules/libvgahw.so...done.
Loaded symbols for /usr/lib/xorg/modules//libvgahw.so
Reading symbols from /usr/lib/xorg/modules/libint10.so...done.
Loaded symbols for /usr/lib/xorg/modules//libint10.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/libxaa.so...done.
Loaded symbols for /usr/lib/xorg/modules//libxaa.so
Reading symbols from /usr/lib/xorg/modules/multimedia/theatre_detect_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/multimedia//theatre_detect_drv.so
Reading symbols from /usr/lib/dri/radeon_dri.so...done.
Loaded symbols for /usr/lib/dri/radeon_dri.so
Reading symbols from /usr/lib/libexpat.so.1...done.
Loaded symbols for /usr/lib/libexpat.so.1
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 /usr/lib/xorg/modules/input/evdev_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input//evdev_drv.so
0xb7f3d424 in __kernel_vsyscall ()
(gdb) c
Continuing.


Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7a40a40 (LWP 1115)]
0x00000000 in ?? ()
(gdb) 
Continuing.

Program terminated with signal SIGSEGV, Segmentation fault.
The program no longer exists.
(gdb) where
No stack.
(gdb) 


# gdb /usr/bin/X ./core.X.1115
GNU gdb 6.8
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 "i686-pc-linux-gnu"...
Reading symbols from /usr/lib/libpciaccess.so.0...done.
Loaded symbols for /usr/lib/libpciaccess.so.0
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/libfreetype.so.6...Reading symbols from /usr/lib/debug/usr/lib/libfreetype.so.6.3.19.debug...done.
done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /lib/libbz2.so.1...done.
Loaded symbols for /lib/libbz2.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 /lib/libz.so.1...done.
Loaded symbols for /lib/libz.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...Reading symbols from /usr/lib/debug/usr/lib/libdbus-1.so.3.4.0.debug...done.
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 /usr/lib/libcrypto.so.0.9.8...done.
Loaded symbols for /usr/lib/libcrypto.so.0.9.8
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 /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1...done.
Loaded symbols for /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /usr/lib/xorg/modules/extensions/libxtrap.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libxtrap.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/libdri.so...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/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/librecord.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//librecord.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/xorg/modules/libvgahw.so...done.
Loaded symbols for /usr/lib/xorg/modules//libvgahw.so
Reading symbols from /usr/lib/xorg/modules/libint10.so...done.
Loaded symbols for /usr/lib/xorg/modules//libint10.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/libxaa.so...done.
Loaded symbols for /usr/lib/xorg/modules//libxaa.so
Reading symbols from /usr/lib/xorg/modules/multimedia/theatre_detect_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/multimedia//theatre_detect_drv.so
Reading symbols from /usr/lib/dri/radeon_dri.so...done.
Loaded symbols for /usr/lib/dri/radeon_dri.so
Reading symbols from /usr/lib/libexpat.so.1...done.
Loaded symbols for /usr/lib/libexpat.so.1
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 /usr/lib/xorg/modules/input/evdev_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input//evdev_drv.so
Core was generated by `X :0 -nolisten tcp -br -auth /home/mmokrejs/.serverauth.1098 -deferglyphs 16'.
Program terminated with signal 11, Segmentation fault.
[New process 1115]
#0  0x00000000 in ?? ()
(gdb) where
#0  0x00000000 in ?? ()
(gdb) bt full
#0  0x00000000 in ?? ()
No symbol table info available.
(gdb) 



To convince you I really have the debug symbols:

# ldd /usr/bin/X | awk '{print$3}' | grep -v '^$' | grep -v '(' | while read l; do file $l*; done
/usr/lib/libpciaccess.so.0:      symbolic link to `libpciaccess.so.0.10.2'
/usr/lib/libpciaccess.so.0.10.2: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/lib/libdl.so.2: symbolic link to `libdl-2.9.so'
/usr/lib/libXfont.so.1:     symbolic link to `libXfont.so.1.4.1'
/usr/lib/libXfont.so.1.4.1: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/usr/lib/libfreetype.so.6:      symbolic link to `libfreetype.so.6.3.19'
/usr/lib/libfreetype.so.6.3.19: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
/lib/libbz2.so.1:     symbolic link to `libbz2.so.1.0.5'
/lib/libbz2.so.1.0:   symbolic link to `libbz2.so.1.0.5'
/lib/libbz2.so.1.0.5: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
/usr/lib/libXau.so.6:     symbolic link to `libXau.so.6.0.0'
/usr/lib/libXau.so.6.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/usr/lib/libfontenc.so.1:     symbolic link to `libfontenc.so.1.0.0'
/usr/lib/libfontenc.so.1.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/lib/libz.so.1:     symbolic link to `libz.so.1.2.3'
/lib/libz.so.1.2.3: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
/usr/lib/libpixman-1.so.0:      symbolic link to `libpixman-1.so.0.14.0'
/usr/lib/libpixman-1.so.0.14.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/usr/lib/libhal.so.1:     symbolic link to `libhal.so.1.0.0'
/usr/lib/libhal.so.1.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/usr/lib/libdbus-1.so.3:     symbolic link to `libdbus-1.so.3.4.0'
/usr/lib/libdbus-1.so.3.4.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, stripped
/usr/lib/libXdmcp.so.6:     symbolic link to `libXdmcp.so.6.0.0'
/usr/lib/libXdmcp.so.6.0.0: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/usr/lib/libcrypto.so.0.9.8: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/lib/libm.so.6: symbolic link to `libm-2.9.so'
/lib/librt.so.1: symbolic link to `librt-2.9.so'
/usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1: ELF 32-bit LSB shared object, Intel 80386, version 1 (SYSV), dynamically linked, not stripped
/lib/libc.so.6: symbolic link to `libc-2.9.so'
/lib/libpthread.so.0: symbolic link to `libpthread-2.9.so'
#

# cd /var/dumps/
# ls -lat *X*
-rw------- 1 root mmokrejs 11448320 Mar 11 17:19 core.X.1115
-rw------- 1 root mmokrejs  6852608 Feb  1 12:51 core.X.28832
-rw------- 1 root mmokrejs  6545408 Feb  1 11:35 core.X.3725
#





In another attempt I tried:

# gdb /usr/bin/X
GNU gdb 6.8
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 "i686-pc-linux-gnu"...
(gdb) run
Starting program: /usr/bin/X 
[Thread debugging using libthread_db enabled]

X.Org X Server 1.5.3
Release Date: 5 November 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.29-rc7 i686 
Current Operating System: Linux vrapenec 2.6.29-rc7 #2 Wed Mar 4 14:15:54 MET 2009 i686
Build Date: 11 March 2009  01:02:53PM
 
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Wed Mar 11 17:35:03 2009
(==) Using config file: "/etc/X11/xorg.conf"
[New Thread 0xb7a71a40 (LWP 4188)]
[tcsetpgrp failed in terminal_inferior: Operation not permitted]
(EE) Failed to load module "freetype" (module does not exist, 0)
NTSC PAL 
  XRANDR name: VGA-0
  Connector: VGA
  CRT1: INTERNAL_DAC1
  DDC reg: 0x60
  XRANDR name: LVDS
  Connector: LVDS
  LCD1: INTERNAL_LVDS
  DDC reg: 0x0
  XRANDR name: S-video
  Connector: S-video
  TV1: INTERNAL_DAC2
  DDC reg: 0x0
finished output detect: 0
finished output detect: 1
finished output detect: 2
finished all detect
before xf86InitialConfiguration
after xf86InitialConfiguration
Entering TV Save
Save TV timing tables
saveTimingTables: reading timing tables
TV Save done
disable LVDS
disable primary dac
disable LVDS
disable TV
disable LVDS
init memmap
init common
init crtc1
init pll1
restore memmap
restore common
restore crtc1
restore pll1
set RMX
set LVDS
enable LVDS
disable primary dac
disable TV

disable LVDS
finished PLL2
Entering Restore TV
Restore TV PLL
Restore TVHV
Restore TV Restarts
Restore Timing Tables
Restore TV standard
Leaving Restore TV
error setting MTRR (base = 0xd8000000, size = 0x02000000, type = 1) Invalid argument (22)
Entering TV Save
Save TV timing tables
saveTimingTables: reading timing tables
TV Save done
disable LVDS
disable primary dac
disable LVDS
disable TV
disable LVDS
init memmap
init common
init crtc1
init pll1
restore memmap
restore common
restore crtc1
restore pll1
set RMX
set LVDS
enable LVDS
disable primary dac
disable TV
[config/dbus] couldn't register object path
disable LVDS
finished PLL2
Entering Restore TV
Restore TV PLL
Restore TVHV
Restore TV Restarts
Restore Timing Tables
Restore TV standard
Leaving Restore TV
error setting MTRR (base = 0xd8000000, size = 0x02000000, type = 1) Invalid argument (22)
Entering TV Save
Save TV timing tables
saveTimingTables: reading timing tables
TV Save done
disable LVDS
disable primary dac
disable LVDS
disable TV
disable LVDS
init memmap
init common
init crtc1
init pll1
restore memmap
restore common
restore crtc1
restore pll1
set RMX
set LVDS
enable LVDS
disable primary dac
disable TV
[config/dbus] couldn't register object path

^C


^C




^Z
[1]+  Stopped                 gdb /usr/bin/X
# killall X
# fg
gdb /usr/bin/X



Quit
(gdb) 
(gdb) where
#0  0xb7f70424 in __kernel_vsyscall ()
#1  0xb7b6f86d in ___newselect_nocancel () from /lib/libc.so.6
#2  0x081214fc in WaitForSomething (pClientsReady=0x85f0778) at WaitFor.c:236
#3  0x08087814 in Dispatch () at dispatch.c:375
#4  0x0806f17d in main (argc=1, argv=0xbff91374, envp=0x0) at main.c:438
(gdb) 


From the above you see that my apps incluing /usr/bin/X have debug symbols.
Please realize the very first object read by gdb was /usr/bin/Xorg and
the second is libpciaccess.so!









Lets go again and try to start Xserver using startx as a user:

$ startx &
[1] 4379
xauth:  creating new authority file /home/mmokrejs/.serverauth.4379


X.Org X Server 1.5.3
Release Date: 5 November 2008
X Protocol Version 11, Revision 0
Build Operating System: Linux 2.6.29-rc7 i686 
Current Operating System: Linux vrapenec 2.6.29-rc7 #2 Wed Mar 4 14:15:54 MET 2009 i686
Build Date: 11 March 2009  01:02:53PM
 
        Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
(==) Log file: "/var/log/Xorg.0.log", Time: Wed Mar 11 17:53:32 2009
(==) Using config file: "/etc/X11/xorg.conf"
(EE) Failed to load module "freetype" (module does not exist, 0)
NTSC PAL 
  XRANDR name: VGA-0
  Connector: VGA
  CRT1: INTERNAL_DAC1
  DDC reg: 0x60
  XRANDR name: LVDS
  Connector: LVDS
  LCD1: INTERNAL_LVDS
  DDC reg: 0x0
  XRANDR name: S-video
  Connector: S-video
  TV1: INTERNAL_DAC2
  DDC reg: 0x0
finished output detect: 0
finished output detect: 1
finished output detect: 2
finished all detect
before xf86InitialConfiguration
after xf86InitialConfiguration
Entering TV Save
Save TV timing tables
saveTimingTables: reading timing tables
TV Save done
disable LVDS
disable primary dac
disable LVDS
disable TV
disable LVDS
init memmap
init common
init crtc1
init pll1
restore memmap
restore common
restore crtc1
restore pll1
set RMX
set LVDS
enable LVDS
disable primary dac
disable TV
[FvwmPager][FlocaleGetFontSet]: (5x8) Missing font charsets:
JISX0208.1983-0, KSC5601.1987-0, GB2312.1980-0, JISX0201.1976-0, ISO10646-1


From an xterm on the local console I started the application and it killed X as usually:

xinit:  connection to X server lost.

waiting for X server to shut down xterm:  fatal IO error 32 (Broken pipe) or KillClient on X server ":0.0"




$ ls -lat /var/dumps/*X*
-rw------- 1 root mmokrejs  8851456 Mar 11 17:53 /var/dumps/core.X.4396
-rw------- 1 root mmokrejs 11448320 Mar 11 17:19 /var/dumps/core.X.1115
-rw------- 1 root mmokrejs  6852608 Feb  1 12:51 /var/dumps/core.X.28832
-rw------- 1 root mmokrejs  6545408 Feb  1 11:35 /var/dumps/core.X.3725
$

# gdb /usr/bin/X /var/dumps/core.X.4396
GNU gdb 6.8
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 "i686-pc-linux-gnu"...

warning: Can't read pathname for load map: Input/output error.
Reading symbols from /usr/lib/libpciaccess.so.0...done.
Loaded symbols for /usr/lib/libpciaccess.so.0
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/libfreetype.so.6...Reading symbols from /usr/lib/debug/usr/lib/libfreetype.so.6.3.19.debug...done.
done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /lib/libbz2.so.1...done.
Loaded symbols for /lib/libbz2.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 /lib/libz.so.1...done.
Loaded symbols for /lib/libz.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...Reading symbols from /usr/lib/debug/usr/lib/libdbus-1.so.3.4.0.debug...done.
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 /usr/lib/libcrypto.so.0.9.8...done.
Loaded symbols for /usr/lib/libcrypto.so.0.9.8
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 /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1...done.
Loaded symbols for /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /usr/lib/xorg/modules/extensions/libxtrap.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libxtrap.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/libdri.so...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/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/librecord.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//librecord.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/xorg/modules/libvgahw.so...done.
Loaded symbols for /usr/lib/xorg/modules//libvgahw.so
Reading symbols from /usr/lib/xorg/modules/libint10.so...done.
Loaded symbols for /usr/lib/xorg/modules//libint10.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/libxaa.so...done.
Loaded symbols for /usr/lib/xorg/modules//libxaa.so
Reading symbols from /usr/lib/xorg/modules/multimedia/theatre_detect_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/multimedia//theatre_detect_drv.so
Reading symbols from /usr/lib/dri/radeon_dri.so...done.
Loaded symbols for /usr/lib/dri/radeon_dri.so
Reading symbols from /usr/lib/libexpat.so.1...done.
Loaded symbols for /usr/lib/libexpat.so.1
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 /usr/lib/xorg/modules/input/evdev_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input//evdev_drv.so
Core was generated by `X :0 -nolisten tcp -br -auth /home/mmokrejs/.serverauth.4379 -deferglyphs 16'.
Program terminated with signal 11, Segmentation fault.
[New process 4396]
#0  0x00000000 in ?? ()
(gdb) where
#0  0x00000000 in ?? ()
(gdb)


Probably, the SUID application does not dump full dump. Please note the line

warning: Can't read pathname for load map: Input/output error.

I suspect that is the culprit. Probably /usr/bin/Xorg should have been in place.








So I have started startx as a user and attached gdb as root to it:

# gdb -p 4475
GNU gdb 6.8
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 "i686-pc-linux-gnu".
Attaching to process 4475
Reading symbols from /usr/bin/Xorg...done.
[cut]
0xb7fe8424 in __kernel_vsyscall ()
(gdb) c
Continuing.

Program received signal SIGSEGV, Segmentation fault.
[Switching to Thread 0xb7ae9a40 (LWP 4475)]
0xb000b398 in ?? ()
(gdb) where
#0  0xb000b398 in ?? ()
(gdb) 


Where are the debug symbols?


$ ls -lat /var/dumps/
total 128456
drwxrwxrwt  2 root     root          4096 Mar 11 18:04 .
-rw-------  1 root     mmokrejs   9408512 Mar 11 18:04 core.X.4475
-rw-------  1 root     mmokrejs   8851456 Mar 11 17:53 core.X.4396
-rw-------  1 root     mmokrejs  11448320 Mar 11 17:19 core.X.1115


# gdb /usr/bin/X /var/dumps/core.X.4475 
GNU gdb 6.8
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 "i686-pc-linux-gnu"...
Reading symbols from /usr/lib/libpciaccess.so.0...done.
Loaded symbols for /usr/lib/libpciaccess.so.0
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/libfreetype.so.6...Reading symbols from /usr/lib/debug/usr/lib/libfreetype.so.6.3.19.debug...done.
done.
Loaded symbols for /usr/lib/libfreetype.so.6
Reading symbols from /lib/libbz2.so.1...done.
Loaded symbols for /lib/libbz2.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 /lib/libz.so.1...done.
Loaded symbols for /lib/libz.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...Reading symbols from /usr/lib/debug/usr/lib/libdbus-1.so.3.4.0.debug...done.
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 /usr/lib/libcrypto.so.0.9.8...done.
Loaded symbols for /usr/lib/libcrypto.so.0.9.8
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 /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1...done.
Loaded symbols for /usr/lib/gcc/i686-pc-linux-gnu/4.3.3/libgcc_s.so.1
Reading symbols from /lib/libc.so.6...done.
Loaded symbols for /lib/libc.so.6
Reading symbols from /lib/ld-linux.so.2...done.
Loaded symbols for /lib/ld-linux.so.2
Reading symbols from /lib/libpthread.so.0...done.
Loaded symbols for /lib/libpthread.so.0
Reading symbols from /usr/lib/xorg/modules/extensions/libxtrap.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//libxtrap.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/libdri.so...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/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/librecord.so...done.
Loaded symbols for /usr/lib/xorg/modules/extensions//librecord.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/xorg/modules/libvgahw.so...done.
Loaded symbols for /usr/lib/xorg/modules//libvgahw.so
Reading symbols from /usr/lib/xorg/modules/libint10.so...done.
Loaded symbols for /usr/lib/xorg/modules//libint10.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/libxaa.so...done.
Loaded symbols for /usr/lib/xorg/modules//libxaa.so
Reading symbols from /usr/lib/xorg/modules/multimedia/theatre_detect_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/multimedia//theatre_detect_drv.so
Reading symbols from /usr/lib/dri/radeon_dri.so...done.
Loaded symbols for /usr/lib/dri/radeon_dri.so
Reading symbols from /usr/lib/libexpat.so.1...done.
Loaded symbols for /usr/lib/libexpat.so.1
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 /usr/lib/xorg/modules/input/evdev_drv.so...done.
Loaded symbols for /usr/lib/xorg/modules/input//evdev_drv.so
Core was generated by `X :0 -nolisten tcp -br -auth /home/mmokrejs/.serverauth.4458 -deferglyphs 16'.
Program terminated with signal 11, Segmentation fault.
[New process 4475]
#0  0xb000b398 in ?? ()
(gdb) where
#0  0xb000b398 in ?? ()
(gdb) quit
#

Again, no debug symbols accessible.