The backtrace doesn't provide enough information. Please install matching debuginfo packages and try to run kwin in valgrind (valgrind --tool=memcheck --num-callers=40 kwin --replace).

where can I find debuginfo files? I have arch linux.
Thank you.

I trace the crash with valgrind, and this is the output:


[arch@arch ~]$ valgrind --tool=memcheck --num-callers=40 kwin --replace
==3684== Memcheck, a memory error detector.
==3684== Copyright (C) 2002-2007, and GNU GPL'd, by Julian Seward et al.
==3684== Using LibVEX rev 1732, a library for dynamic binary translation.
==3684== Copyright (C) 2004-2007, and GNU GPL'd, by OpenWorks LLP.
==3684== Using valgrind-3.2.3, a dynamic binary instrumentation framework.
==3684== Copyright (C) 2000-2007, and GNU GPL'd, by Julian Seward et al.
==3684== For more details, rerun with: -v
==3684==
--3684-- VALGRIND INTERNAL ERROR: Valgrind received a signal 11 (SIGSEGV) - exit
ing
--3684-- si_code=1;  Faulting address: 0xCA46DBEC;  sp: 0x6220CEB4

valgrind: the 'impossible' happened:
   Killed by fatal signal
==3684==    at 0x3801F9BD: vgPlain_arena_free (in /usr/lib/valgrind/x86-linux/me
mcheck)
==3684==    by 0x3801FB55: vgPlain_free (in /usr/lib/valgrind/x86-linux/memcheck
)
==3684==    by 0x38001967: die_and_free_mem (in /usr/lib/valgrind/x86-linux/memc
heck)
==3684==    by 0x3803728F: vgPlain_scheduler (in /usr/lib/valgrind/x86-linux/mem
check)
==3684==    by 0x38057B91: run_a_thread_NORETURN (in /usr/lib/valgrind/x86-linux
/memcheck)

sched status:
  running_tid=1

Thread 1: status = VgTs_Runnable
==3684==    at 0x4020D18: operator delete[](void*) (in /usr/lib/valgrind/x86-lin
ux/vgpreload_memcheck.so)
==3684==    by 0x4BA7C7C: QStringData::deleteSelf() (in /opt/qt/lib/libqt-mt.so.
3.3.8)
==3684==    by 0x4474679: KIconThemeDir::iconPath(QString const&) const (in /opt
/kde/lib/libkdecore.so.4.2.0)
==3684==    by 0x44747B7: KIconTheme::iconPath(QString const&, int, KIcon::Match
Type) const (in /opt/kde/lib/libkdecore.so.4.2.0)
==3684==    by 0x4474CB1: KIconLoader::findMatchingIcon(QString const&, int) con
st (in /opt/kde/lib/libkdecore.so.4.2.0)
==3684==    by 0x449AD15: KIconLoader::loadIcon(QString const&, KIcon::Group, in
t, int, QString*, bool) const (in /opt/kde/lib/libkdecore.so.4.2.0)
==3684==    by 0x44F7118: KWin::icon(unsigned long, int, int, bool, int) (in /op
t/kde/lib/libkdecore.so.4.2.0)
==3684==    by 0x404EF25: KWinInternal::Client::getIcons() (in /opt/kde/lib/libk
deinit_kwin.so)
==3684==    by 0x4085805: KWinInternal::Client::manage(unsigned long, bool) (in
/opt/kde/lib/libkdeinit_kwin.so)
==3684==    by 0x4087675: KWinInternal::Workspace::createClient(unsigned long, b
ool) (in /opt/kde/lib/libkdeinit_kwin.so)
==3684==    by 0x408ACCC: KWinInternal::Workspace::workspaceEvent(_XEvent*) (in
/opt/kde/lib/libkdeinit_kwin.so)
==3684==    by 0x408ADCD: KWinInternal::Application::x11EventFilter(_XEvent*) (i
n /opt/kde/lib/libkdeinit_kwin.so)
==3684==    by 0x481B574: (within /opt/qt/lib/libqt-mt.so.3.3.8)
==3684==    by 0x482A547: QApplication::x11ProcessEvent(_XEvent*) (in /opt/qt/li                                                              b/libqt-mt.so.3.3.8)
==3684==    by 0x483B3AC: QEventLoop::processEvents(unsigned) (in /opt/qt/lib/li                                                              bqt-mt.so.3.3.8)
==3684==    by 0x48A217F: QEventLoop::enterLoop() (in /opt/qt/lib/libqt-mt.so.3.                                                              3.8)
==3684==    by 0x48A2015: QEventLoop::exec() (in /opt/qt/lib/libqt-mt.so.3.3.8)
==3684==    by 0x488B6FE: QApplication::exec() (in /opt/qt/lib/libqt-mt.so.3.3.8                                                              )
==3684==    by 0x4088F42: kdemain (in /opt/kde/lib/libkdeinit_kwin.so)
==3684==    by 0x80485D1: _init (in /opt/kde/bin/kwin)
==3684==    by 0x4FE1F8F: (below main) (in /lib/libc-2.6.1.so)


Note: see also the FAQ.txt in the source distribution.
It contains workarounds to several common problems.

If that doesn't help, please report this bug to: www.valgrind.org

In the bug report, send all the above text, the valgrind
version, and what Linux distro you are using.  Thanks.

[arch@arch ~]$

I have no idea, you need to ask on your distribution-specific list/newsgroup/forum/whatever.

ok recompiled the glibc, I get this output:

(no debugging symbols found)
Using host libthread_db library "/lib/libthread_db.so.1".
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
(no debugging symbols found)
[Thread debugging using libthread_db enabled]
[New Thread -1231751456 (LWP 2910)]
[KCrash handler]
#6  0xb774d637 in NETWinInfo::windowType () from /opt/kde/lib/libkdecore.so.4
#7  0xb670e186 in KWinInternal::Client::windowType ()
   from /opt/kde/lib/libkdeinit_kwin.so
#8  0xb670ea91 in KWinInternal::Client::isDesktop ()
   from /opt/kde/lib/libkdeinit_kwin.so
#9  0xb670f2b2 in KWinInternal::Client::isSpecialWindow ()
   from /opt/kde/lib/libkdeinit_kwin.so
#10 0xb67577fd in KWinInternal::findClientInList<KWinInternal::FetchNameInternalPredicate> () from /opt/kde/lib/libkdeinit_kwin.so
#11 0xb6732ace in KWinInternal::Client::setCaption ()
   from /opt/kde/lib/libkdeinit_kwin.so
#12 0xb674c7b0 in KWinInternal::Client::manage ()
   from /opt/kde/lib/libkdeinit_kwin.so
#13 0xb674e676 in KWinInternal::Workspace::createClient ()
   from /opt/kde/lib/libkdeinit_kwin.so
#14 0xb6751ccd in KWinInternal::Workspace::workspaceEvent ()
   from /opt/kde/lib/libkdeinit_kwin.so
#15 0xb6751dce in KWinInternal::Application::x11EventFilter ()
   from /opt/kde/lib/libkdeinit_kwin.so
#16 0xb70b0575 in ?? () from /opt/qt/lib/libqt-mt.so.3
#17 0xbffba0b0 in ?? ()
#18 0xbffb9f88 in ?? ()
#19 0x00100000 in ?? ()
#20 0xb75c7dd0 in ?? () from /opt/qt/lib/libqt-mt.so.3
#21 0xb75c7dd0 in ?? () from /opt/qt/lib/libqt-mt.so.3
#22 0x0000000c in ?? ()
#23 0xbffb9e98 in ?? ()
#24 0xb70bf548 in QApplication::x11ProcessEvent ()
   from /opt/qt/lib/libqt-mt.so.3
Backtrace stopped: frame did not save the PC

Sorry, but this is still without any debugging information.

hi, this is the correct trace:

Using host libthread_db library "/lib/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1232169232 (LWP 2930)]
[KCrash handler]
#6  0xb77fbb5a in NETWinInfo::windowType (this=0x911da80, supported_types=959)
    at netwm.cpp:4394
#7  0xb65eb686 in KWinInternal::Client::windowType (this=0x81df920, 
    direct=false, supported_types=959) at client.cpp:1723
#8  0xb65ee931 in KWinInternal::Client::isDesktop (this=0x81df920)
    at client.cpp:1671
#9  0xb65f0352 in KWinInternal::Client::isSpecialWindow (this=0x81df920)
    at client.cpp:1718
#10 0xb65f0855 in KWinInternal::Client::isMovable (this=0x81df920)
    at geometry.cpp:1608
#11 0xb660b4f9 in KWinInternal::Client::handleMoveResize (this=0x81df920, 
    x=44, y=0, x_root=297, y_root=29) at geometry.cpp:2396
#12 0xb660ca1d in KWinInternal::Client::motionNotifyEvent (this=0x81df920, 
    w=14735385, x=44, y=0, x_root=297, y_root=29) at events.cpp:1356
#13 0xb6617bce in KWinInternal::Client::windowEvent (this=0x81df920, 
    e=0xbf868928) at events.cpp:594
#14 0xb66180e4 in KWinInternal::Workspace::workspaceEvent (this=0x8124bf8, 
    e=0xbf868928) at events.cpp:279
#15 0xb66185fb in KWinInternal::Application::x11EventFilter (this=0xbf868a30, 
    e=0xbf868928) at main.cpp:155
#16 0xb704ce15 in ?? () from /opt/qt/lib/libqt-mt.so.3
#17 0xbf868a30 in ?? ()
#18 0xbf868928 in ?? ()
#19 0x00003fc0 in ?? ()
#20 0xb756cf3c in ?? () from /opt/qt/lib/libqt-mt.so.3
#21 0xb756cf3c in ?? () from /opt/qt/lib/libqt-mt.so.3
#22 0x00000000 in ?? ()

I cannot tell much from the backtraces, only that the code is most probably accessing already deleted data. Can you please try again with valgrind, maybe you will manage to get a proper trace without valgrind internal error?

Waiting for a response.

Hi, sorry for the absence.
I couldn't manage to do what you asked, but I'm realizing that these errors are caused by ram problems (mem86 faults on test 8 and gcc often crashes on segmentation faults).

Thank you for your attention.
KKnull