Application: plasma-desktop (4.11.7)
KDE Platform Version: 4.12.3 (Compiled from sources)
Qt Version: 4.8.5
Operating System: Linux 3.13.6-gentoo x86_64
Distribution: "Gentoo Base System release 2.2"

-- Information about the crash:
I closed several applications (Firefox, Thunderbird, Konsole) via right-click -> close, none of them were grouped. Other reports of similar crashes show a stack trace that is quite different from the one I'm seeing so I guess that it's not a duplicate. I'm using Gentoo x64 as my distribution of choice. Everything was compiled only with "-O2 -march=native" as Cflags.

-- Backtrace:
Application: Plasma-Desktop-Umgebung (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fbc118b2780 (LWP 5013))]

Thread 3 (Thread 0x7fbbef1eb700 (LWP 5017)):
#0  pthread_cond_wait () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fbc0454ea6b in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7fbc0484cf00 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007fbc0454eaa9 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007fbc0f5a2073 in start_thread (arg=0x7fbbef1eb700) at pthread_create.c:309
#4  0x00007fbc0f2dcdcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7fbb6a19b700 (LWP 5018)):
#0  0x00007fbc0f2d364d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fbc0c40beb4 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7fbb64002bb0, timeout=-1, context=0x7fbb640009a0) at /var/tmp/portage/dev-libs/glib-2.38.2-r1/work/glib-2.38.2/glib/gmain.c:4007
#2  g_main_context_iterate (context=context@entry=0x7fbb640009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.38.2-r1/work/glib-2.38.2/glib/gmain.c:3708
#3  0x00007fbc0c40bfbc in g_main_context_iteration (context=0x7fbb640009a0, may_block=1) at /var/tmp/portage/dev-libs/glib-2.38.2-r1/work/glib-2.38.2/glib/gmain.c:3774
#4  0x00007fbc10906846 in QEventDispatcherGlib::processEvents (this=0x7fbb640008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:427
#5  0x00007fbc108d894f in QEventLoop::processEvents (this=this@entry=0x7fbb6a19ae20, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007fbc108d8c45 in QEventLoop::exec (this=this@entry=0x7fbb6a19ae20, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007fbc107d873f in QThread::exec (this=this@entry=0xdd5cf0) at thread/qthread.cpp:536
#8  0x00007fbc108ba313 in QInotifyFileSystemWatcherEngine::run (this=0xdd5cf0) at io/qfilesystemwatcher_inotify.cpp:256
#9  0x00007fbc107dad7f in QThreadPrivate::start (arg=0xdd5cf0) at thread/qthread_unix.cpp:338
#10 0x00007fbc0f5a2073 in start_thread (arg=0x7fbb6a19b700) at pthread_create.c:309
#11 0x00007fbc0f2dcdcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7fbc118b2780 (LWP 5013)):
[KCrash Handler]
#6  0x00007fbc108eaf14 in QObject::killTimer (this=0x2007765, id=-268435329) at kernel/qobject.cpp:1602
#7  0x00007fbc108f67f1 in QTimer::stop (this=this@entry=0x2007765) at kernel/qtimer.cpp:266
#8  0x00007fbc108f687f in QTimer::start (this=0x2007765) at kernel/qtimer.cpp:216
#9  0x00007fbc108f68b8 in QTimer::start (this=<optimized out>, msec=msec@entry=800) at kernel/qtimer.cpp:234
#10 0x00007fbb6de277b3 in MouseEventListener::sceneEventFilter (this=0x3403890, item=0x2bda3f0, event=0x7ffff01d0b90) at /var/tmp/portage/kde-base/plasma-runtime-4.12.3/work/plasma-runtime-4.12.3/plasma/declarativeimports/qtextracomponents/mouseeventlistener.cpp:184
#11 0x00007fbc10246315 in QGraphicsScenePrivate::filterDescendantEvent (this=this@entry=0x103d850, item=item@entry=0x2bda3f0, event=event@entry=0x7ffff01d0b90) at graphicsview/qgraphicsscene.cpp:1159
#12 0x00007fbc1024a93e in QGraphicsScenePrivate::sendEvent (this=0x103d850, item=0x2bda3f0, event=0x7ffff01d0b90) at graphicsview/qgraphicsscene.cpp:1211
#13 0x00007fbc1024ae3f in QGraphicsScenePrivate::sendMouseEvent (this=0x103d850, mouseEvent=0x7ffff01d0b90) at graphicsview/qgraphicsscene.cpp:1295
#14 0x00007fbc10256d66 in QGraphicsScenePrivate::mousePressEventHandler (this=this@entry=0x103d850, mouseEvent=mouseEvent@entry=0x7ffff01d0b90) at graphicsview/qgraphicsscene.cpp:1422
#15 0x00007fbc102571f9 in QGraphicsScene::mousePressEvent (this=<optimized out>, mouseEvent=0x7ffff01d0b90) at graphicsview/qgraphicsscene.cpp:4074
#16 0x00007fbc10260050 in QGraphicsScene::event (this=0xee8df0, event=0x7ffff01d0b90) at graphicsview/qgraphicsscene.cpp:3455
#17 0x00007fbc0fc8246c in QApplicationPrivate::notify_helper (this=this@entry=0xe0b020, receiver=receiver@entry=0xee8df0, e=e@entry=0x7ffff01d0b90) at kernel/qapplication.cpp:4562
#18 0x00007fbc0fc88a30 in QApplication::notify (this=this@entry=0xddff40, receiver=receiver@entry=0xee8df0, e=e@entry=0x7ffff01d0b90) at kernel/qapplication.cpp:4348
#19 0x00007fbc114aebca in KApplication::notify (this=0xddff40, receiver=0xee8df0, event=0x7ffff01d0b90) at /var/tmp/portage/kde-base/kdelibs-4.12.3/work/kdelibs-4.12.3/kdeui/kernel/kapplication.cpp:311
#20 0x00007fbc108d9ced in QCoreApplication::notifyInternal (this=0xddff40, receiver=0xee8df0, event=event@entry=0x7ffff01d0b90) at kernel/qcoreapplication.cpp:949
#21 0x00007fbc0fc80e06 in sendSpontaneousEvent (event=event@entry=0x7ffff01d0b90, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#22 qt_sendSpontaneousEvent (receiver=<optimized out>, event=event@entry=0x7ffff01d0b90) at kernel/qapplication.cpp:5560
#23 0x00007fbc1027681f in QGraphicsView::mousePressEvent (this=0x1ea5dd0, event=0x7ffff01d1100) at graphicsview/qgraphicsview.cpp:3164
#24 0x00007fbc0fcd17a1 in QWidget::event (this=this@entry=0x1ea5dd0, event=event@entry=0x7ffff01d1100) at kernel/qwidget.cpp:8372
#25 0x00007fbc1006bbbe in QFrame::event (this=0x1ea5dd0, e=0x7ffff01d1100) at widgets/qframe.cpp:557
#26 0x00007fbc10277569 in QGraphicsView::viewportEvent (this=0x1ea5dd0, event=0x7ffff01d1100) at graphicsview/qgraphicsview.cpp:2866
#27 0x00007fbc108d9e56 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0xe0b020, receiver=receiver@entry=0x1e31210, event=event@entry=0x7ffff01d1100) at kernel/qcoreapplication.cpp:1059
#28 0x00007fbc0fc8244c in QApplicationPrivate::notify_helper (this=this@entry=0xe0b020, receiver=receiver@entry=0x1e31210, e=e@entry=0x7ffff01d1100) at kernel/qapplication.cpp:4558
#29 0x00007fbc0fc88b6d in QApplication::notify (this=this@entry=0xddff40, receiver=receiver@entry=0x1e31210, e=e@entry=0x7ffff01d1100) at kernel/qapplication.cpp:4105
#30 0x00007fbc114aebca in KApplication::notify (this=0xddff40, receiver=0x1e31210, event=0x7ffff01d1100) at /var/tmp/portage/kde-base/kdelibs-4.12.3/work/kdelibs-4.12.3/kdeui/kernel/kapplication.cpp:311
#31 0x00007fbc108d9ced in QCoreApplication::notifyInternal (this=0xddff40, receiver=receiver@entry=0x1e31210, event=event@entry=0x7ffff01d1100) at kernel/qcoreapplication.cpp:949
#32 0x00007fbc0fc88323 in sendEvent (event=<optimized out>, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#33 QApplicationPrivate::sendMouseEvent (receiver=receiver@entry=0x1e31210, event=event@entry=0x7ffff01d1100, alienWidget=alienWidget@entry=0x1e31210, nativeWidget=nativeWidget@entry=0x1ea5dd0, buttonDown=buttonDown@entry=0x7fbc1075c278 <qt_button_down>, lastMouseReceiver=..., spontaneous=spontaneous@entry=true) at kernel/qapplication.cpp:3173
#34 0x00007fbc0fcf9cf0 in QETWidget::translateMouseEvent (this=this@entry=0x1ea5dd0, event=event@entry=0x7ffff01d1430) at kernel/qapplication_x11.cpp:4517
#35 0x00007fbc0fcf808c in QApplication::x11ProcessEvent (this=0xddff40, event=event@entry=0x7ffff01d1430) at kernel/qapplication_x11.cpp:3640
#36 0x00007fbc0fd1e722 in x11EventSourceDispatch (s=s@entry=0xe0af40, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#37 0x00007fbc0c40bbc6 in g_main_dispatch (context=0xe0b3b0) at /var/tmp/portage/dev-libs/glib-2.38.2-r1/work/glib-2.38.2/glib/gmain.c:3066
#38 g_main_context_dispatch (context=context@entry=0xe0b3b0) at /var/tmp/portage/dev-libs/glib-2.38.2-r1/work/glib-2.38.2/glib/gmain.c:3642
#39 0x00007fbc0c40bf18 in g_main_context_iterate (context=context@entry=0xe0b3b0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at /var/tmp/portage/dev-libs/glib-2.38.2-r1/work/glib-2.38.2/glib/gmain.c:3713
#40 0x00007fbc0c40bfbc in g_main_context_iteration (context=0xe0b3b0, may_block=1) at /var/tmp/portage/dev-libs/glib-2.38.2-r1/work/glib-2.38.2/glib/gmain.c:3774
#41 0x00007fbc10906825 in QEventDispatcherGlib::processEvents (this=0xdfab90, flags=...) at kernel/qeventdispatcher_glib.cpp:425
#42 0x00007fbc0fd1e7c6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#43 0x00007fbc108d894f in QEventLoop::processEvents (this=this@entry=0x7ffff01d1800, flags=...) at kernel/qeventloop.cpp:149
#44 0x00007fbc108d8c45 in QEventLoop::exec (this=this@entry=0x7ffff01d1800, flags=...) at kernel/qeventloop.cpp:204
#45 0x00007fbc108ddd5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1221
#46 0x00007fbc0fc80c2c in QApplication::exec () at kernel/qapplication.cpp:3823
#47 0x00007fbc00d0055c in kdemain (argc=1, argv=0xd265b0) at /var/tmp/portage/kde-base/plasma-workspace-4.11.7/work/plasma-workspace-4.11.7/plasma/desktop/shell/main.cpp:126
#48 0x0000000000407eee in launch (argc=argc@entry=1, _name=_name@entry=0xd249d8 "/usr/bin/plasma-desktop", args=<optimized out>, args@entry=0xd249f0 "", cwd=cwd@entry=0x0, envc=envc@entry=0, envs=<optimized out>, envs@entry=0xd249f8 "", reset_env=false, tty=tty@entry=0x0, avoid_loops=false, startup_id_str=startup_id_str@entry=0x40a744 "0") at /var/tmp/portage/kde-base/kdelibs-4.12.3/work/kdelibs-4.12.3/kinit/kinit.cpp:726
#49 0x0000000000408d6b in handle_launcher_request (sock=7, who=<optimized out>) at /var/tmp/portage/kde-base/kdelibs-4.12.3/work/kdelibs-4.12.3/kinit/kinit.cpp:1218
#50 0x00000000004093c7 in handle_requests (waitForPid=waitForPid@entry=0) at /var/tmp/portage/kde-base/kdelibs-4.12.3/work/kdelibs-4.12.3/kinit/kinit.cpp:1411
#51 0x00000000004051c8 in main (argc=2, argv=<optimized out>, envp=0x7ffff01d21a0) at /var/tmp/portage/kde-base/kdelibs-4.12.3/work/kdelibs-4.12.3/kinit/kinit.cpp:1899

Possible duplicates by query: bug 331658, bug 331115, bug 330766, bug 330109, bug 327435.

Reported using DrKonqi