Application: plasma-desktop (0.4)
KDE Platform Version: 4.8.3 (4.8.3)
Qt Version: 4.8.1
Operating System: Linux 3.2.0-24-generic x86_64
Distribution: Ubuntu 12.04 LTS

-- Information about the crash:
- What I was doing when the application crashed:
I wrote words in Japanese using uim(Japanese IME)
- Unusual behavior I noticed:
Plasma Workspases is Crash
- Custom settings of the application:
I use two Desktops (dual display). But the Crash is happen in only one desktop. it is not occured    in another one.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma デスクトップシェル (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7f98740de780 (LWP 2228))]

Thread 4 (Thread 0x7f9847e67700 (LWP 2295)):
#0  0x00007f9870ab4bdc in qt_gettime () at tools/qelapsedtimer_unix.cpp:146
#1  0x00007f9870b8cb8d in QTimerInfoList::updateCurrentTime (this=0x7f9840002860) at kernel/qeventdispatcher_unix.cpp:343
#2  0x00007f9870b8cec3 in QTimerInfoList::timerWait (this=0x7f9840002860, tm=...) at kernel/qeventdispatcher_unix.cpp:450
#3  0x00007f9870b8b97c in timerSourcePrepareHelper (src=<optimized out>, timeout=0x7f9847e66c6c) at kernel/qeventdispatcher_glib.cpp:136
#4  0x00007f9870b8ba25 in timerSourcePrepare (source=<optimized out>, timeout=<optimized out>) at kernel/qeventdispatcher_glib.cpp:169
#5  0x00007f9867b6871e in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007f9867b68f1b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#7  0x00007f9867b69124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#8  0x00007f9870b8c426 in QEventDispatcherGlib::processEvents (this=0x7f98400008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#9  0x00007f9870b5bc82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#10 0x00007f9870b5bed7 in QEventLoop::exec (this=0x7f9847e66dd0, flags=...) at kernel/qeventloop.cpp:204
#11 0x00007f9870a5afa7 in QThread::exec (this=<optimized out>) at thread/qthread.cpp:501
#12 0x00007f9870b3b9ff in QInotifyFileSystemWatcherEngine::run (this=0x412dc30) at io/qfilesystemwatcher_inotify.cpp:248
#13 0x00007f9870a5dfcb in QThreadPrivate::start (arg=0x412dc30) at thread/qthread_unix.cpp:298
#14 0x00007f986846de9a in start_thread (arg=0x7f9847e67700) at pthread_create.c:308
#15 0x00007f98739bb4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#16 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f9844f99700 (LWP 2297)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f986d940222 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f986d940259 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f986846de9a in start_thread (arg=0x7f9844f99700) at pthread_create.c:308
#4  0x00007f98739bb4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f983e621700 (LWP 2299)):
#0  0x00007f98739afb03 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f9867b68ff6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f9867b6945a in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f983f10b2c6 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f9867b8a9a5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f986846de9a in start_thread (arg=0x7f983e621700) at pthread_create.c:308
#6  0x00007f98739bb4bd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f98740de780 (LWP 2228)):
[KCrash Handler]
#6  size (this=<error reading variable: Cannot access memory at address 0x0>) at ../../include/QtCore/../../src/corelib/tools/qvector.h:137
#7  QTextLayout::lineCount (this=0x0) at text/qtextlayout.cpp:841
#8  0x00007f9870190c4c in QTextCursorPrivate::blockLayout (this=0x814c940, block=...) at text/qtextcursor.cpp:880
#9  0x00007f9870191ce7 in setX (this=0x814c940) at text/qtextcursor.cpp:141
#10 QTextCursorPrivate::setX (this=0x814c940) at text/qtextcursor.cpp:133
#11 0x00007f9870197ae4 in QTextCursorPrivate::movePosition (this=0x814c940, op=QTextCursor::EndOfLine, mode=QTextCursor::KeepAnchor) at text/qtextcursor.cpp:673
#12 0x00007f987019893c in movePosition (n=1, mode=QTextCursor::KeepAnchor, op=QTextCursor::EndOfLine, this=0x7fffd434a780) at text/qtextcursor.cpp:1251
#13 QTextCursor::movePosition (this=0x7fffd434a780, op=QTextCursor::EndOfLine, mode=QTextCursor::KeepAnchor, n=<optimized out>) at text/qtextcursor.cpp:1235
#14 0x00007f9850c040f8 in NotesTextEdit::leaveEvent (this=0x39cc4c0, event=<optimized out>) at ../../../applets/notes/textedit.cpp:193
#15 0x00007f986ff300dc in QWidget::event (this=0x39cc4c0, event=0x7fffd434b140) at kernel/qwidget.cpp:8496
#16 0x00007f98702f03b6 in QFrame::event (this=0x39cc4c0, e=0x7fffd434b140) at widgets/qframe.cpp:557
#17 0x00007f98703724c3 in QAbstractScrollArea::event (this=0x39cc4c0, e=0x7fffd434b140) at widgets/qabstractscrollarea.cpp:996
#18 0x00007f987035ee30 in QTextEdit::event (this=0x39cc4c0, e=0x7fffd434b140) at widgets/qtextedit.cpp:1070
#19 0x00007f986fedf894 in notify_helper (e=0x7fffd434b140, receiver=0x39cc4c0, this=0x1dc7420) at kernel/qapplication.cpp:4559
#20 QApplicationPrivate::notify_helper (this=0x1dc7420, receiver=0x39cc4c0, e=0x7fffd434b140) at kernel/qapplication.cpp:4531
#21 0x00007f986fee4713 in QApplication::notify (this=0x1db1040, receiver=0x39cc4c0, e=0x7fffd434b140) at kernel/qapplication.cpp:4420
#22 0x00007f987183abb6 in KApplication::notify (this=0x1db1040, receiver=0x39cc4c0, event=0x7fffd434b140) at ../../kdeui/kernel/kapplication.cpp:311
#23 0x00007f9870b5ce9c in QCoreApplication::notifyInternal (this=0x1db1040, receiver=0x39cc4c0, event=0x7fffd434b140) at kernel/qcoreapplication.cpp:876
#24 0x00007f986fedfe5b in sendEvent (event=0x7fffd434b140, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#25 QApplicationPrivate::dispatchEnterLeave (enter=0x0, leave=<optimized out>) at kernel/qapplication.cpp:2810
#26 0x00007f98704e0e28 in QGraphicsProxyWidget::hoverLeaveEvent (this=<optimized out>, event=<optimized out>) at graphicsview/qgraphicsproxywidget.cpp:1187
#27 0x00007f98704c53e3 in QGraphicsItem::sceneEvent (this=0x39f05e0, event=0x7fffd434b2b0) at graphicsview/qgraphicsitem.cpp:6732
#28 0x00007f98704ede4c in QGraphicsScenePrivate::sendHoverEvent (this=0x1f848d0, type=<optimized out>, item=0x39f05e0, hoverEvent=0x7fffd434b3a0) at graphicsview/qgraphicsscene.cpp:1268
#29 0x00007f98704ee07b in QGraphicsScenePrivate::leaveScene (this=0x1f848d0, viewport=<optimized out>) at graphicsview/qgraphicsscene.cpp:3979
#30 0x00007f98704fca4c in QGraphicsScene::event (this=0x1e806e0, event=0x7fffd434c030) at graphicsview/qgraphicsscene.cpp:3483
#31 0x00007f986fedf894 in notify_helper (e=0x7fffd434c030, receiver=0x1e806e0, this=0x1dc7420) at kernel/qapplication.cpp:4559
#32 QApplicationPrivate::notify_helper (this=0x1dc7420, receiver=0x1e806e0, e=0x7fffd434c030) at kernel/qapplication.cpp:4531
#33 0x00007f986fee4713 in QApplication::notify (this=0x1db1040, receiver=0x1e806e0, e=0x7fffd434c030) at kernel/qapplication.cpp:4420
#34 0x00007f987183abb6 in KApplication::notify (this=0x1db1040, receiver=0x1e806e0, event=0x7fffd434c030) at ../../kdeui/kernel/kapplication.cpp:311
#35 0x00007f9870b5ce9c in QCoreApplication::notifyInternal (this=0x1db1040, receiver=0x1e806e0, event=0x7fffd434c030) at kernel/qcoreapplication.cpp:876
#36 0x00007f987051acc7 in sendEvent (event=0x7fffd434c030, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#37 QGraphicsView::viewportEvent (this=0x313d7a0, event=0x7fffd434c030) at graphicsview/qgraphicsview.cpp:2795
#38 0x00007f9870b5d028 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0x3152ad0, event=0x7fffd434c030) at kernel/qcoreapplication.cpp:986
#39 0x00007f986fedf85f in notify_helper (e=0x7fffd434c030, receiver=0x3152ad0, this=0x1dc7420) at kernel/qapplication.cpp:4555
#40 QApplicationPrivate::notify_helper (this=0x1dc7420, receiver=0x3152ad0, e=0x7fffd434c030) at kernel/qapplication.cpp:4531
#41 0x00007f986fee4713 in QApplication::notify (this=0x1db1040, receiver=0x3152ad0, e=0x7fffd434c030) at kernel/qapplication.cpp:4420
#42 0x00007f987183abb6 in KApplication::notify (this=0x1db1040, receiver=0x3152ad0, event=0x7fffd434c030) at ../../kdeui/kernel/kapplication.cpp:311
#43 0x00007f9870b5ce9c in QCoreApplication::notifyInternal (this=0x1db1040, receiver=0x3152ad0, event=0x7fffd434c030) at kernel/qcoreapplication.cpp:876
#44 0x00007f986fedfe5b in sendEvent (event=0x7fffd434c030, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#45 QApplicationPrivate::dispatchEnterLeave (enter=0x4714da0, leave=<optimized out>) at kernel/qapplication.cpp:2810
#46 0x00007f986ff5e9f1 in QApplication::x11ProcessEvent (this=0x1db1040, event=0x7fffd434c690) at kernel/qapplication_x11.cpp:3805
#47 0x00007f986ff880d2 in x11EventSourceDispatch (s=0x1dd26b0, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#48 0x00007f9867b68c9a in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#49 0x00007f9867b69060 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#50 0x00007f9867b69124 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#51 0x00007f9870b8c3bf in QEventDispatcherGlib::processEvents (this=0x1d3ab10, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#52 0x00007f986ff87d5e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#53 0x00007f9870b5bc82 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#54 0x00007f9870b5bed7 in QEventLoop::exec (this=0x7fffd434ca30, flags=...) at kernel/qeventloop.cpp:204
#55 0x00007f9870b60f67 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1148
#56 0x00007f9873cc7a13 in kdemain (argc=1, argv=0x7fffd434ce18) at ../../../../plasma/desktop/shell/main.cpp:120
#57 0x00007f98738ea76d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffd434ce18, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffd434ce08) at libc-start.c:226
#58 0x0000000000400671 in _start ()

Possible duplicates by query: bug 299074, bug 298582, bug 293202.

Reported using DrKonqi