(no debugging symbols found) means that you do not have the debug symbols installed and therefore the crash reports are useless for developers. Please install the debug packages provided by your distributor.

Further details can be found at http://techbase.kde.org/Contribute/Bugsquad/How_to_create_useful_crash_reports

nwendung: KWin (kwin), Signal SIGABRT
[Thread debugging using libthread_db enabled]
[New Thread 0x7f6cc115e730 (LWP 3826)]
[KCrash handler]
#5  0x00007f6cc926cef5 in raise () from /lib/libc.so.6
#6  0x00007f6cc926e413 in abort () from /lib/libc.so.6
#7  0x00007f6cc98b2ce9 in ?? () from /usr/lib/libGL.so.1
#8  0x00007f6cc28ae38e in ?? () from /usr/lib/libGLcore.so.1
#9  0x00007f6cc28aef63 in ?? () from /usr/lib/libGLcore.so.1
#10 0x00007f6cc261a464 in ?? () from /usr/lib/libGLcore.so.1
#11 0x00007f6cc2363506 in ?? () from /usr/lib/libGLcore.so.1
#12 0x00007f6cc961d3a5 in KWin::SceneOpenGL::flushBuffer (this=0x9905a0,
    mask=<value optimized out>, damage=
        {d = 0x6641c0, static shared_empty = {ref = {_q_value = 51}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}})
    at /tmp/buildd/kdebase-workspace-4.1.2/kwin/scene_opengl.cpp:696
#13 0x00007f6cc961db5a in KWin::SceneOpenGL::paint (this=0x9905a0, damage=
        {d = 0x7fffd1a63460, static shared_empty = {ref = {_q_value = 51}, rgn = 0x0, xrectangles = 0x0, qt_rgn = 0x0}}, toplevels=<value optimized out>)
    at /tmp/buildd/kdebase-workspace-4.1.2/kwin/scene_opengl.cpp:628
#14 0x00007f6cc960fa34 in KWin::Workspace::performCompositing (this=0x664e20)
    at /tmp/buildd/kdebase-workspace-4.1.2/kwin/composite.cpp:357
#15 0x00007f6cc95b42e2 in KWin::Workspace::qt_metacall (this=0x664e20,
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>,
    _a=0x7fffd1a635d0)
    at /tmp/buildd/kdebase-workspace-4.1.2/obj-x86_64-linux-gnu/kwin/workspace.moc:433
#16 0x00007f6cc60c76d4 in QMetaObject::activate (sender=0x665218,
    from_signal_index=<value optimized out>, to_signal_index=4,
    argv=0xffffffffffffffff) at kernel/qobject.cpp:3031
#17 0x00007f6cc60c1fe3 in QObject::event (this=0x665218, e=0xef2)
    at kernel/qobject.cpp:1120
#18 0x00007f6cc8020a5d in QApplicationPrivate::notify_helper (this=0x623300,
    receiver=0x665218, e=0x7fffd1a63c80) at kernel/qapplication.cpp:3803
#19 0x00007f6cc80287da in QApplication::notify (this=0x7fffd1a63ff0,
    receiver=0x665218, e=0x7fffd1a63c80) at kernel/qapplication.cpp:3768
#20 0x00007f6cc7a7f41b in KApplication::notify (this=0x7fffd1a63ff0,
    receiver=0x665218, event=0x7fffd1a63c80)
    at /tmp/buildd/kde4libs-4.1.2/kdeui/kernel/kapplication.cpp:311
#21 0x00007f6cc60b3381 in QCoreApplication::notifyInternal (
    this=0x7fffd1a63ff0, receiver=0x665218, event=0x7fffd1a63c80)
    at kernel/qcoreapplication.cpp:587
#22 0x00007f6cc60df256 in QTimerInfoList::activateTimers (this=0x626990)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:209
#23 0x00007f6cc60db7ad in timerSourceDispatch (source=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:160
#24 0x00007f6cc4c5b78b in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#25 0x00007f6cc4c5ef5d in ?? () from /usr/lib/libglib-2.0.so.0
#26 0x00007f6cc4c5f11b in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#27 0x00007f6cc60db70f in QEventDispatcherGlib::processEvents (this=0x622f50,
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:319
#28 0x00007f6cc80b244f in QGuiEventDispatcherGlib::processEvents (this=0xef2,
    flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:198
#29 0x00007f6cc60b1ca2 in QEventLoop::processEvents (
    this=<value optimized out>, flags={i = -777634064})
    at kernel/qeventloop.cpp:143
#30 0x00007f6cc60b1e2d in QEventLoop::exec (this=0x7fffd1a63f30, flags=
      {i = -777633984}) at kernel/qeventloop.cpp:194
#31 0x00007f6cc60b42dd in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:845
#32 0x00007f6cc95cd161 in kdemain (argc=3, argv=0x7fffd1a64498)
    at /tmp/buildd/kdebase-workspace-4.1.2/kwin/main.cpp:511
#33 0x00007f6cc92591a6 in __libc_start_main () from /lib/libc.so.6
#34 0x0000000000400629 in _start ()
#0  0x00007f6cc92d90b0 in __nanosleep_nocancel () from /lib/libc.so.6

What is the matching error message in ~/.xsession-errors for the abort?

I've got plenty of these lines:
---
X Error: BadWindow (invalid Window parameter) 3
  Major opcode: 20 (X_GetProperty)
  Resource id:  0x1400026
---
But I'm not sure if that is what you are asking for.

Can you reproduce this with the latest nVidia drivers? If so please attach your full ~/.xsession-errors

KWin still crashes, even with the latest Nvidia drivers (180.06 on amd64) on KDE 4.1.3.

Here is the stacktrace. I'll provide the .xsession-errors file later.

Anwendung: KWin (kwin), Signal SIGSEGV
[Thread debugging using libthread_db enabled]
[New Thread 0x7f87896c6730 (LWP 3834)]
[KCrash handler]
#5  0x00007f8786b5a474 in ?? () from /usr/lib/libGL.so.1
#6  0x00007f8786b3a6f4 in ?? () from /usr/lib/libGL.so.1
#7  0x00007f8786b3ac33 in ?? () from /usr/lib/libGL.so.1
#8  0x00007f87824a9a43 in ?? () from /usr/lib/libGLcore.so.1
#9  0x00007f87824a9d3b in _nv000101gl () from /usr/lib/libGLcore.so.1
#10 0x00007f8782243dfc in ?? () from /usr/lib/libGLcore.so.1
#11 0x00007f878222c039 in ?? () from /usr/lib/libGLcore.so.1
#12 0x00007f87822193e4 in ?? () from /usr/lib/libGLcore.so.1
#13 0x00007f878223b243 in ?? () from /usr/lib/libGLcore.so.1
#14 0x00007f878223e4f3 in ?? () from /usr/lib/libGLcore.so.1
#15 0x00007f87821e81a5 in ?? () from /usr/lib/libGLcore.so.1
#16 0x00007f8781f2c16e in ?? () from /usr/lib/libGLcore.so.1
#17 0x00007f8781f88aa5 in ?? () from /usr/lib/libGLcore.so.1
#18 0x00007f87822f0566 in ?? () from /usr/lib/libGLcore.so.1
#19 0x00007f8781f28303 in ?? () from /usr/lib/libGLcore.so.1
#20 0x00007f8781f29c35 in ?? () from /usr/lib/libGLcore.so.1
#21 0x00007f8788bbc6f6 in KWin::GLRenderTarget::initFBO (this=0x8807f0)
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/lib/kwinglutils.cpp:936
#22 0x00007f8788bbc9f0 in GLRenderTarget (this=0x8807f0, 
    color=<value optimized out>)
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/lib/kwinglutils.cpp:888
#23 0x00007f877e3a9847 in KWin::BlurEffect::loadData (this=0x9b7850)
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/effects/blur.cpp:89
#24 0x00007f877e3a9d12 in BlurEffect (this=0x9b7850)
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/effects/blur.cpp:50
#25 0x00007f877e3a9e86 in effect_create_kwin4_effect_blur ()
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/effects/blur.cpp:34
#26 0x00007f87893ccef4 in KWin::EffectsHandlerImpl::loadEffect (
    this=0xa81930, name=@0x9ca5e0)
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/effects.cpp:848
#27 0x00007f87893cd7f1 in KWin::EffectsHandlerImpl::reconfigure (
    this=0xa81930) at /tmp/buildd/kdebase-workspace-4.1.3/kwin/effects.cpp:93
#28 0x00007f87893b42e7 in KWin::Workspace::setupCompositing (this=0x6f79f0)
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/composite.cpp:194
#29 0x00007f878935a2f2 in KWin::Workspace::qt_metacall (this=0x6f79f0, 
    _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, 
    _a=0x7fff91809350)
    at /tmp/buildd/kdebase-workspace-4.1.3/obj-x86_64-linux-gnu/kwin/workspace.moc:432
#30 0x00007f8785d816d4 in QMetaObject::activate (sender=0xa50120, 
    from_signal_index=<value optimized out>, to_signal_index=4, 
    argv=0x8932fa40) at kernel/qobject.cpp:3031
#31 0x00007f8785d8793f in QSingleShotTimer::timerEvent (this=0xa50120)
    at kernel/qtimer.cpp:294
#32 0x00007f8785d7bfe3 in QObject::event (this=0xa50120, e=0x945b28)
    at kernel/qobject.cpp:1120
#33 0x00007f8787dc6a5d in QApplicationPrivate::notify_helper (this=0x626580, 
    receiver=0xa50120, e=0x7fff91809a10) at kernel/qapplication.cpp:3803
#34 0x00007f8787dce7da in QApplication::notify (this=0x7fff91809d80, 
    receiver=0xa50120, e=0x7fff91809a10) at kernel/qapplication.cpp:3768
#35 0x00007f878782585b in KApplication::notify (this=0x7fff91809d80, 
    receiver=0xa50120, event=0x7fff91809a10)
    at /tmp/buildd/kde4libs-4.1.3/kdeui/kernel/kapplication.cpp:311
#36 0x00007f8785d6d381 in QCoreApplication::notifyInternal (
    this=0x7fff91809d80, receiver=0xa50120, event=0x7fff91809a10)
    at kernel/qcoreapplication.cpp:587
#37 0x00007f8785d99256 in QTimerInfoList::activateTimers (this=0x629c30)
    at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:209
#38 0x00007f8785d957ad in timerSourceDispatch (source=<value optimized out>)
    at kernel/qeventdispatcher_glib.cpp:160
#39 0x00007f878491478b in g_main_context_dispatch ()
   from /usr/lib/libglib-2.0.so.0
#40 0x00007f8784917f5d in ?? () from /usr/lib/libglib-2.0.so.0
#41 0x00007f878491811b in g_main_context_iteration ()
   from /usr/lib/libglib-2.0.so.0
#42 0x00007f8785d9570f in QEventDispatcherGlib::processEvents (this=0x6261d0, 
    flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:319
#43 0x00007f8787e5844f in QGuiEventDispatcherGlib::processEvents (
    this=0x7f87, flags=<value optimized out>)
    at kernel/qguieventdispatcher_glib.cpp:198
#44 0x00007f8785d6bca2 in QEventLoop::processEvents (
    this=<value optimized out>, flags={i = -1853842304})
    at kernel/qeventloop.cpp:143
#45 0x00007f8785d6be2d in QEventLoop::exec (this=0x7fff91809cc0, flags=
      {i = -1853842224}) at kernel/qeventloop.cpp:194
#46 0x00007f8785d6e2dd in QCoreApplication::exec ()
    at kernel/qcoreapplication.cpp:845
#47 0x00007f8789373191 in kdemain (argc=3, argv=0x7fff9180a228)
    at /tmp/buildd/kdebase-workspace-4.1.3/kwin/main.cpp:511
#48 0x00007f8788fff1a6 in __libc_start_main () from /lib/libc.so.6
#49 0x0000000000400629 in _start ()
#0  0x00007f878907efc0 in __nanosleep_nocancel () from /lib/libc.so.6

64-bit and blur were the missing parts. Disable blur and it will no longer crash.

*** This bug has been marked as a duplicate of bug 164889 ***