Need help with gdb - trying to provide a backtrace for kwin

[drbenway]

Hi.

I am trying to give the KDE developers a backtrace for a nasty (crashing) bug in kde4. - see bug :-

http://bugs.kde.org/show_bug.cgi?id=157282

I am unable to use gdb to provide a backtrace, i'm nearly there but must be doing something wrong..



This is what i am doing

From console in kde (as root)

# ps aux | grep kwin (to find kwin pid)

# gdb kwin (pid)

- at this point i am unable to click on anything (as kwin is frozen..)

I turn logging on by

# set logging on

I then try to debug by using

# continue

- after using continue I can start to use kde (kwin) again, however no more output is created.

Can someone please point me in the right direction I must be doing something wrong, or even better provide example lines that they would use....


Cheers

i.e - here is (one of many) attempts

-------------------------------------------------------------

suse64:/home/morgan # cat /home/kde4user/gdb-kwin.txt
GNU gdb 6.6.50.20070726-cvs
Copyright (C) 2007 Free Software Foundation, Inc.
GDB is free software, covered by the GNU General Public License, and you are
welcome to change it and/or distribute copies of it under certain conditions.
Type "show copying" to see the conditions.
There is absolutely no warranty for GDB. Type "show warranty" for details.
This GDB was configured as "x86_64-suse-linux".
(gdb) attach 13394
Attaching to process 13394
Reading symbols from /usr/bin/kwin...Reading symbols from /usr/lib/debug/usr/bin/kwin.debug...done.
Using host libthread_db library "/lib64/libthread_db.so.1".
done.
Reading symbols from /usr/lib64/libkdeinit4_kwin.so...Reading symbols from /usr/lib/debug/usr/lib64/libkdeinit4_kwin.so.debug...done.
done.
Loaded symbols for /usr/lib64/libkdeinit4_kwin.so
Reading symbols from /usr/lib64/libSM.so.6...done.
Loaded symbols for /usr/lib64/libSM.so.6
Reading symbols from /usr/lib64/libICE.so.6...done.
Loaded symbols for /usr/lib64/libICE.so.6
Reading symbols from /usr/lib64/libX11.so.6...done.
Loaded symbols for /usr/lib64/libX11.so.6
Reading symbols from /usr/lib64/libXext.so.6...done.
Loaded symbols for /usr/lib64/libXext.so.6
Reading symbols from /usr/lib64/libXft.so.2...done.
Loaded symbols for /usr/lib64/libXft.so.2
Reading symbols from /usr/lib64/libXau.so.6...done.
Loaded symbols for /usr/lib64/libXau.so.6
Reading symbols from /usr/lib64/libXdmcp.so.6...done.
Loaded symbols for /usr/lib64/libXdmcp.so.6
Reading symbols from /usr/lib64/libXpm.so.4...done.
Loaded symbols for /usr/lib64/libXpm.so.4
Reading symbols from /usr/lib64/libXfixes.so.3...done.
Loaded symbols for /usr/lib64/libXfixes.so.3
Reading symbols from /usr/lib64/libXrender.so.1...done.
Loaded symbols for /usr/lib64/libXrender.so.1
Reading symbols from /usr/lib64/libkdecorations.so.4...Reading symbols from /usr/lib/debug/usr/lib64/libkdecorations.so.4.0.0.debug...done.
done.
Loaded symbols for /usr/lib64/libkdecorations.so.4
Reading symbols from /usr/lib64/libkwineffects.so.1...Reading symbols from /usr/lib/debug/usr/lib64/libkwineffects.so.1.0.0.debug...done.
done.
Loaded symbols for /usr/lib64/libkwineffects.so.1
Reading symbols from /usr/lib64/libQtSvg.so.4...done.
Loaded symbols for /usr/lib64/libQtSvg.so.4
Reading symbols from /usr/lib64/libkdecore.so.5...Reading symbols from /usr/lib/debug/usr/lib64/libkdecore.so.5.0.0.debug...done.
done.
Loaded symbols for /usr/lib64/libkdecore.so.5
Reading symbols from /usr/lib64/libQtCore.so.4...done.
Loaded symbols for /usr/lib64/libQtCore.so.4
Reading symbols from /lib64/libpthread.so.0...done.
[Thread debugging using libthread_db enabled]
[New Thread 0x2b7009a99ec0 (LWP 13394)]
Loaded symbols for /lib64/libpthread.so.0
Reading symbols from /usr/lib64/libQtNetwork.so.4...done.
Loaded symbols for /usr/lib64/libQtNetwork.so.4
Reading symbols from /usr/lib64/libQtDBus.so.4...done.
Loaded symbols for /usr/lib64/libQtDBus.so.4
Reading symbols from /lib64/libz.so.1...done.
Loaded symbols for /lib64/libz.so.1
Reading symbols from /lib64/libbz2.so.1...done.
Loaded symbols for /lib64/libbz2.so.1
Reading symbols from /lib64/libresolv.so.2...done.
Loaded symbols for /lib64/libresolv.so.2
Reading symbols from /usr/lib64/libQtGui.so.4...done.
Loaded symbols for /usr/lib64/libQtGui.so.4
Reading symbols from /usr/lib64/libQtXml.so.4...done.
Loaded symbols for /usr/lib64/libQtXml.so.4
Reading symbols from /usr/lib64/libXtst.so.6...done.
Loaded symbols for /usr/lib64/libXtst.so.6
Reading symbols from /usr/lib64/libXcursor.so.1...done.
Loaded symbols for /usr/lib64/libXcursor.so.1
Reading symbols from /usr/lib64/libkdeui.so.5...Reading symbols from /usr/lib/debug/usr/lib64/libkdeui.so.5.0.0.debug...done.
done.
Loaded symbols for /usr/lib64/libkdeui.so.5
Reading symbols from /usr/lib64/libGL.so.1...done.
Loaded symbols for /usr/lib64/libGL.so.1
Reading symbols from /lib64/libdl.so.2...done.
Loaded symbols for /lib64/libdl.so.2
Reading symbols from /usr/lib64/libkwinnvidiahack.so.4...Reading symbols from /usr/lib/debug/usr/lib64/libkwinnvidiahack.so.4.0.0.debug...done.
done.
Loaded symbols for /usr/lib64/libkwinnvidiahack.so.4
Reading symbols from /usr/lib64/libXrandr.so.2...done.
Loaded symbols for /usr/lib64/libXrandr.so.2
Reading symbols from /usr/lib64/libXcomposite.so.1...done.
Loaded symbols for /usr/lib64/libXcomposite.so.1
Reading symbols from /usr/lib64/libXdamage.so.1...done.
Loaded symbols for /usr/lib64/libXdamage.so.1
Reading symbols from /usr/lib64/libstdc++.so.6...done.
Loaded symbols for /usr/lib64/libstdc++.so.6
Reading symbols from /lib64/libm.so.6...done.
Loaded symbols for /lib64/libm.so.6
Reading symbols from /lib64/libgcc_s.so.1...done.
Loaded symbols for /lib64/libgcc_s.so.1
Reading symbols from /lib64/libc.so.6...done.
Loaded symbols for /lib64/libc.so.6
Reading symbols from /usr/lib64/libxcb-xlib.so.0...done.
Loaded symbols for /usr/lib64/libxcb-xlib.so.0
Reading symbols from /usr/lib64/libxcb.so.1...done.
Loaded symbols for /usr/lib64/libxcb.so.1
Reading symbols from /usr/lib64/libfontconfig.so.1...done.
Loaded symbols for /usr/lib64/libfontconfig.so.1
Reading symbols from /usr/lib64/libfreetype.so.6...done.
Loaded symbols for /usr/lib64/libfreetype.so.6
Reading symbols from /usr/lib64/libpng12.so.0...done.
Loaded symbols for /usr/lib64/libpng12.so.0
Reading symbols from /usr/lib64/libXi.so.6...done.
Loaded symbols for /usr/lib64/libXi.so.6
Reading symbols from /usr/lib64/libXinerama.so.1...done.
Loaded symbols for /usr/lib64/libXinerama.so.1
Reading symbols from /usr/lib64/libgthread-2.0.so.0...done.
Loaded symbols for /usr/lib64/libgthread-2.0.so.0
Reading symbols from /lib64/librt.so.1...done.
Loaded symbols for /lib64/librt.so.1
Reading symbols from /usr/lib64/libglib-2.0.so.0...done.
Loaded symbols for /usr/lib64/libglib-2.0.so.0
Reading symbols from /lib64/ld-linux-x86-64.so.2...done.
Loaded symbols for /lib64/ld-linux-x86-64.so.2
Reading symbols from /lib64/libdbus-1.so.3...done.
Loaded symbols for /lib64/libdbus-1.so.3
Reading symbols from /usr/lib64/libGLcore.so.1...done.
Loaded symbols for /usr/lib64/libGLcore.so.1
Reading symbols from /usr/lib64/tls/libnvidia-tls.so.1...done.
Loaded symbols for /usr/lib64/tls/libnvidia-tls.so.1
Reading symbols from /lib64/libexpat.so.1...done.
Loaded symbols for /lib64/libexpat.so.1
Reading symbols from /usr/lib64/libpcre.so.0...done.
Loaded symbols for /usr/lib64/libpcre.so.0
Reading symbols from /usr/lib64/gconv/UTF-16.so...done.
Loaded symbols for /usr/lib64/gconv/UTF-16.so
Reading symbols from /usr/lib64/kde4/plugins/styles/oxygen.so...done.
Loaded symbols for /usr/lib64/kde4/plugins/styles/oxygen.so
Reading symbols from /usr/lib64/kde4/kwin3_oxygen.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/kwin3_oxygen.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/kwin3_oxygen.so
Reading symbols from /usr/lib64/kde4/kwin4_effect_builtins.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/kwin4_effect_builtins.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/kwin4_effect_builtins.so
Reading symbols from /usr/lib64/qt4/plugins/imageformats/libqgif.so...done.
Loaded symbols for /usr/lib64/qt4/plugins/imageformats/libqgif.so
Reading symbols from /usr/lib64/qt4/plugins/imageformats/libqjpeg.so...done.
Loaded symbols for /usr/lib64/qt4/plugins/imageformats/libqjpeg.so
Reading symbols from /usr/lib64/libjpeg.so.62...done.
Loaded symbols for /usr/lib64/libjpeg.so.62
Reading symbols from /usr/lib64/qt4/plugins/imageformats/libqmng.so...done.
Loaded symbols for /usr/lib64/qt4/plugins/imageformats/libqmng.so
Reading symbols from /usr/lib64/libmng.so.1...done.
Loaded symbols for /usr/lib64/libmng.so.1
Reading symbols from /usr/lib64/liblcms.so.1...done.
Loaded symbols for /usr/lib64/liblcms.so.1
Reading symbols from /usr/lib64/qt4/plugins/imageformats/libqsvg.so...done.
Loaded symbols for /usr/lib64/qt4/plugins/imageformats/libqsvg.so
Reading symbols from /usr/lib64/qt4/plugins/imageformats/libqtiff.so...done.
Loaded symbols for /usr/lib64/qt4/plugins/imageformats/libqtiff.so
Reading symbols from /usr/lib64/libtiff.so.3...done.
Loaded symbols for /usr/lib64/libtiff.so.3
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_dds.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_dds.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_dds.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_eps.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_eps.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_eps.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_exr.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_exr.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_exr.so
Reading symbols from /usr/lib64/libImath.so.4...done.
Loaded symbols for /usr/lib64/libImath.so.4
Reading symbols from /usr/lib64/libIlmImf.so.4...done.
Loaded symbols for /usr/lib64/libIlmImf.so.4
Reading symbols from /usr/lib64/libIex.so.4...done.
Loaded symbols for /usr/lib64/libIex.so.4
Reading symbols from /usr/lib64/libHalf.so.4...done.
Loaded symbols for /usr/lib64/libHalf.so.4
Reading symbols from /usr/lib64/libIlmThread.so.4...done.
Loaded symbols for /usr/lib64/libIlmThread.so.4
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_ico.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_ico.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_ico.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_jp2.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_jp2.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_jp2.so
Reading symbols from /usr/lib64/libjasper.so.1...done.
Loaded symbols for /usr/lib64/libjasper.so.1
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_pcx.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_pcx.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_pcx.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_psd.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_psd.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_psd.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_rgb.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_rgb.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_rgb.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_tga.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_tga.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_tga.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_xcf.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_xcf.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_xcf.so
Reading symbols from /usr/lib64/kde4/plugins/imageformats/kimg_xview.so...Reading symbols from /usr/lib/debug/usr/lib64/kde4/plugins/imageformats/kimg_xview.so.debug...done.
done.
Loaded symbols for /usr/lib64/kde4/plugins/imageformats/kimg_xview.so
0x00002b7006f0d9af in poll () from /lib64/libc.so.6
(gdb) continue
Continuing.

--------------------------------

No more output is produced - even when it does crash X/kwin....

- also are you meant to use CTRL+C to get out of continue mode ?
_________________
Studies show that 9 out of 10 paedophiles use Windows ...
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[drbenway]

As this bug is still present any help would be really welcomed - and help to solve this nasty bug....
_________________
Studies show that 9 out of 10 paedophiles use Windows ...
------------------------------------------------------------------------------------------------