please install the debug package for kdebase-workspace  and paste the new crash log

Let me know if you need anything else.  This is new in 4.4.4 also.

 
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fdb879a0760 (LWP 29768))]

Thread 2 (Thread 0x7fdb60bec710 (LWP 29772)):
#0  0x00007fdb84990f53 in *__GI___poll (fds=<value optimized out>, nfds=<value optimized out>, timeout=-1) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fdb813554a9 in ?? () from /lib/libglib-2.0.so.0
#2  0x00007fdb813558fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#3  0x00007fdb85f98566 in QEventDispatcherGlib::processEvents (this=0x13fecc0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:414
#4  0x00007fdb85f6d992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#5  0x00007fdb85f6dd6c in QEventLoop::exec (this=0x7fdb60bebdb0, flags=) at kernel/qeventloop.cpp:201
#6  0x00007fdb85e77d59 in QThread::exec (this=<value optimized out>) at thread/qthread.cpp:487
#7  0x00007fdb85f4e178 in QInotifyFileSystemWatcherEngine::run (this=0x13fe690) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fdb85e7a775 in QThreadPrivate::start (arg=0x13fe690) at thread/qthread_unix.cpp:248
#9  0x00007fdb85bea9ca in start_thread (arg=<value optimized out>) at pthread_create.c:300
#10 0x00007fdb8499d6cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fdb879a0760 (LWP 29768)):
[KCrash Handler]
#5  QGraphicsLinearLayout::d_func (this=0x0, item=0x19bd710) at graphicsview/qgraphicslinearlayout.h:109
#6  QGraphicsLinearLayout::removeItem (this=0x0, item=0x19bd710) at graphicsview/qgraphicslinearlayout.cpp:311
#7  0x00007fdb799be93a in PanelAppletOverlay::mouseMoveEvent (this=0x1b53510, event=0x7fff1b5b75d0) at ../../../../plasma/desktop/shell/panelappletoverlay.cpp:331
#8  0x00007fdb851611df in QWidget::event (this=0x1b53510, event=0x7fff1b5b75d0) at kernel/qwidget.cpp:7983
#9  0x00007fdb8510b22c in QApplicationPrivate::notify_helper (this=0xb79d50, receiver=0x1b53510, e=0x7fff1b5b75d0) at kernel/qapplication.cpp:4300
#10 0x00007fdb85111ecb in QApplication::notify (this=0xb70610, receiver=0x1b53510, e=0x7fff1b5b75d0) at kernel/qapplication.cpp:3865
#11 0x00007fdb864b6606 in KApplication::notify (this=0xb70610, receiver=0x1b53510, event=0x7fff1b5b75d0) at ../../kdeui/kernel/kapplication.cpp:302
#12 0x00007fdb85f6f06c in QCoreApplication::notifyInternal (this=0xb70610, receiver=0x1b53510, event=0x7fff1b5b75d0) at kernel/qcoreapplication.cpp:704
#13 0x00007fdb851110ae in QCoreApplication::sendEvent (receiver=0x1b53510, event=0x7fff1b5b75d0, alienWidget=0x0, nativeWidget=0x16b8f80, buttonDown=<value optimized out>, 
    lastMouseReceiver=<value optimized out>, spontaneous=true) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#14 QApplicationPrivate::sendMouseEvent (receiver=0x1b53510, event=0x7fff1b5b75d0, alienWidget=0x0, nativeWidget=0x16b8f80, buttonDown=<value optimized out>, lastMouseReceiver=<value optimized out>, 
    spontaneous=true) at kernel/qapplication.cpp:2965
#15 0x00007fdb85190f65 in QETWidget::translateMouseEvent (this=0x16b8f80, event=<value optimized out>) at kernel/qapplication_x11.cpp:4368
#16 0x00007fdb8518f8ac in QApplication::x11ProcessEvent (this=<value optimized out>, event=0x7fff1b5b7ef0) at kernel/qapplication_x11.cpp:3501
#17 0x00007fdb851bb882 in x11EventSourceDispatch (s=0xb7b380, callback=<value optimized out>, user_data=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:146
#18 0x00007fdb813518c2 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#19 0x00007fdb81355748 in ?? () from /lib/libglib-2.0.so.0
#20 0x00007fdb813558fc in g_main_context_iteration () from /lib/libglib-2.0.so.0
#21 0x00007fdb85f98513 in QEventDispatcherGlib::processEvents (this=0xb79560, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:412
#22 0x00007fdb851bb46e in QGuiEventDispatcherGlib::processEvents (this=0x0, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#23 0x00007fdb85f6d992 in QEventLoop::processEvents (this=<value optimized out>, flags=) at kernel/qeventloop.cpp:149
#24 0x00007fdb85f6dd6c in QEventLoop::exec (this=0x7fff1b5b8220, flags=) at kernel/qeventloop.cpp:201
#25 0x00007fdb85f71aab in QCoreApplication::exec () at kernel/qcoreapplication.cpp:981
#26 0x00007fdb799adfb2 in kdemain (argc=<value optimized out>, argv=<value optimized out>) at ../../../../plasma/desktop/shell/main.cpp:112
#27 0x00000000004070f3 in launch (argc=1, _name=<value optimized out>, args=<value optimized out>, cwd=<value optimized out>, envc=0, envs=<value optimized out>, reset_env=false, tty=0x0, 
    avoid_loops=false, startup_id_str=0x40a4f9 "0") at ../../kinit/kinit.cpp:717
#28 0x0000000000407cb0 in handle_launcher_request (sock=8, who=<value optimized out>) at ../../kinit/kinit.cpp:1209
#29 0x000000000040823a in handle_requests (waitForPid=0) at ../../kinit/kinit.cpp:1402
#30 0x0000000000408e22 in main (argc=4, argv=<value optimized out>, envp=<value optimized out>) at ../../kinit/kinit.cpp:1845

is it OK ?

Index: plasma/desktop/shell/panelappletoverlay.cpp
===================================================================
--- plasma/desktop/shell/panelappletoverlay.cpp (révision 1132806)
+++ plasma/desktop/shell/panelappletoverlay.cpp (copie de travail)
@@ -328,8 +328,10 @@
         m_spacer = new AppletMoveSpacer(m_applet);
         m_spacer->setMinimumSize(m_applet->geometry().size());
         m_spacer->setMaximumSize(m_applet->geometry().size());
-        m_layout->removeItem(m_applet);
-        m_layout->insertItem(m_index, m_spacer);
+        if (m_layout) {
+            m_layout->removeItem(m_applet);
+            m_layout->insertItem(m_index, m_spacer);
+       }
     }
 
     QPoint p = mapToParent(event->pos());

SVN commit 1133542 by nlecureuil:

Fix crash when moving widget from panel to desktop
FIXED-IN: 4.4.5
BUG:240399


 M  +2 -0      panelappletoverlay.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1133542

Thanks for the patch Nicolas.  I don't have a test environment set up right now, but it appears this is probably the cause of the problem.

Thanks for the speedy reply.

SVN commit 1133543 by nlecureuil:

forward port commit 1133541
CCBUG: 240399


 M  +2 -0      panelappletoverlay.cpp  


WebSVN link: http://websvn.kde.org/?view=rev&revision=1133543

*** Bug 241546 has been marked as a duplicate of this bug. ***

Created attachment 48327 [details]
New crash information added by DrKonqi

Plasma desktop è andato in crash dopo che volevo aggiungere/spostare nuovi oggetti al pannello..

*** Bug 242831 has been marked as a duplicate of this bug. ***

*** Bug 246091 has been marked as a duplicate of this bug. ***

*** Bug 249240 has been marked as a duplicate of this bug. ***

*** Bug 253945 has been marked as a duplicate of this bug. ***

*** Bug 257048 has been marked as a duplicate of this bug. ***

*** Bug 259011 has been marked as a duplicate of this bug. ***

*** Bug 259464 has been marked as a duplicate of this bug. ***

*** Bug 261352 has been marked as a duplicate of this bug. ***

Created attachment 55737 [details]
New crash information added by DrKonqi

I was trying to move a panel from the bottom of the screen and the crash occured.

*** Bug 264870 has been marked as a duplicate of this bug. ***