Application: plasma-desktop (4.11.13)
KDE Platform Version: 4.14.2
Qt Version: 4.8.6
Operating System: Linux 3.16.7-200.fc20.x86_64 x86_64
Distribution (Platform): Fedora RPMs

-- Information about the crash:
Occurred immediately after entering credentials in login prompt.
Fails similarly in 'failsafe' environment.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
Using host libthread_db library "/lib64/libthread_db.so.1".
81	T_PSEUDO (SYSCALL_SYMBOL, SYSCALL_NAME, SYSCALL_NARGS)
[Current thread is 1 (Thread 0x7f436e688940 (LWP 2491))]

Thread 3 (Thread 0x7f435252a700 (LWP 2538)):
#0  0x000000382a8ea71d in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x000000382d0495b4 in g_main_context_poll (priority=2147483647, n_fds=1, fds=0x7f43440029b0, timeout=-1, context=0x7f43440009a0) at gmain.c:4007
#2  g_main_context_iterate (context=context@entry=0x7f43440009a0, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3708
#3  0x000000382d0496dc in g_main_context_iteration (context=0x7f43440009a0, may_block=1) at gmain.c:3774
#4  0x00000038359b543e in QEventDispatcherGlib::processEvents (this=0x7f43440008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:452
#5  0x000000383598538f in QEventLoop::processEvents (this=this@entry=0x7f4352529c40, flags=...) at kernel/qeventloop.cpp:149
#6  0x00000038359856dd in QEventLoop::exec (this=this@entry=0x7f4352529c40, flags=...) at kernel/qeventloop.cpp:204
#7  0x0000003835879e5f in QThread::exec (this=this@entry=0x3873990) at thread/qthread.cpp:538
#8  0x0000003835965de3 in QInotifyFileSystemWatcherEngine::run (this=0x3873990) at io/qfilesystemwatcher_inotify.cpp:265
#9  0x000000383587c69f in QThreadPrivate::start (arg=0x3873990) at thread/qthread_unix.cpp:349
#10 0x000000382b407ee5 in start_thread (arg=0x7f435252a700) at pthread_create.c:309
#11 0x000000382a8f4b8d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7f435131c700 (LWP 2540)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x0000003844d8ef1b in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x384508df00 <QTWTF::pageheap_memory>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x0000003844d8ef59 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=<optimized out>) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x000000382b407ee5 in start_thread (arg=0x7f435131c700) at pthread_create.c:309
#4  0x000000382a8f4b8d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7f436e688940 (LWP 2491)):
[KCrash Handler]
#6  findChar (str=0x100000000000000, len=<optimized out>, ch=..., from=0, cs=cs@entry=Qt::CaseSensitive) at tools/qstring.cpp:342
#7  0x00000038358c299a in QString::indexOf (this=this@entry=0x7fff01f56cd0, ch=..., ch@entry=..., from=<optimized out>, cs=cs@entry=Qt::CaseSensitive) at tools/qstring.cpp:2626
#8  0x0000003837df08ab in QKeySequence::mnemonic (text=...) at kernel/qkeysequence.cpp:1093
#9  0x0000003838238b54 in QTabBar::insertTab (this=0x2502b70, index=2, index@entry=-1, icon=..., text=...) at widgets/qtabbar.cpp:848
#10 0x0000003b9541fe2b in Plasma::TabBar::insertTab (this=this@entry=0x24a0890, index=index@entry=-1, icon=..., label=..., content=content@entry=0x2658310) at /usr/src/debug/kdelibs-4.14.2/plasma/widgets/tabbar.cpp:310
#11 0x0000003b95420034 in Plasma::TabBar::insertTab (this=0x24a0890, index=index@entry=-1, label=..., content=content@entry=0x2658310) at /usr/src/debug/kdelibs-4.14.2/plasma/widgets/tabbar.cpp:319
#12 0x00007f435ee20337 in TabbingGroup::restoreChildGroupInfo (this=0x24c7c10, child=0x26582f0, group=...) at /usr/src/debug/kdeplasma-addons-4.14.2/containments/groupingdesktop/lib/groups/tabbinggroup.cpp:154
#13 0x00007f435ee053f1 in AbstractGroup::restoreChildren (this=this@entry=0x24c7c10) at /usr/src/debug/kdeplasma-addons-4.14.2/containments/groupingdesktop/lib/abstractgroup.cpp:615
#14 0x00007f435ee20e9d in TabbingGroup::restoreChildren (this=0x24c7c10) at /usr/src/debug/kdeplasma-addons-4.14.2/containments/groupingdesktop/lib/groups/tabbinggroup.cpp:140
#15 0x00007f435ee02424 in AbstractGroupPrivate::restoreChildren (this=0x2515700) at /usr/src/debug/kdeplasma-addons-4.14.2/containments/groupingdesktop/lib/abstractgroup.cpp:187
#16 0x00007f435ee0b964 in GroupingContainmentPrivate::restoreGroups (this=<optimized out>) at /usr/src/debug/kdeplasma-addons-4.14.2/containments/groupingdesktop/lib/groupingcontainment.cpp:508
#17 0x000000383599f90e in QObject::event (this=this@entry=0x249d630, e=e@entry=0x2631a60) at kernel/qobject.cpp:1222
#18 0x00000038383fbedb in QGraphicsWidget::event (this=0x249d630, event=0x2631a60) at graphicsview/qgraphicswidget.cpp:1461
#19 0x0000003837dcae5c in QApplicationPrivate::notify_helper (this=0x20d52f0, receiver=0x249d630, e=0x2631a60) at kernel/qapplication.cpp:4565
#20 0x0000003837dd17b5 in QApplication::notify (this=this@entry=0x20c7fe0, receiver=receiver@entry=0x249d630, e=e@entry=0x2631a60) at kernel/qapplication.cpp:4351
#21 0x0000003d8b84a53a in KApplication::notify (this=0x20c7fe0, receiver=0x249d630, event=0x2631a60) at /usr/src/debug/kdelibs-4.14.2/kdeui/kernel/kapplication.cpp:311
#22 0x00000038359868fd in QCoreApplication::notifyInternal (this=0x20c7fe0, receiver=receiver@entry=0x249d630, event=event@entry=0x2631a60) at kernel/qcoreapplication.cpp:953
#23 0x0000003835989ae5 in sendEvent (event=0x2631a60, receiver=0x249d630) at kernel/qcoreapplication.h:231
#24 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x20578e0) at kernel/qcoreapplication.cpp:1577
#25 0x0000003835989f83 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1470
#26 0x00000038359b5c9e in sendPostedEvents () at kernel/qcoreapplication.h:236
#27 postEventSourceDispatch (s=s@entry=0x20cecd0) at kernel/qeventdispatcher_glib.cpp:300
#28 0x000000382d0492a6 in g_main_dispatch (context=0x20d5690) at gmain.c:3066
#29 g_main_context_dispatch (context=context@entry=0x20d5690) at gmain.c:3642
#30 0x000000382d049628 in g_main_context_iterate (context=context@entry=0x20d5690, block=block@entry=1, dispatch=dispatch@entry=1, self=<optimized out>) at gmain.c:3713
#31 0x000000382d0496dc in g_main_context_iteration (context=0x20d5690, may_block=1) at gmain.c:3774
#32 0x00000038359b541e in QEventDispatcherGlib::processEvents (this=0x2059260, flags=...) at kernel/qeventdispatcher_glib.cpp:450
#33 0x0000003837e6cc46 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:207
#34 0x000000383598538f in QEventLoop::processEvents (this=this@entry=0x7fff01f57690, flags=...) at kernel/qeventloop.cpp:149
#35 0x00000038359856dd in QEventLoop::exec (this=this@entry=0x7fff01f57690, flags=...) at kernel/qeventloop.cpp:204
#36 0x000000383598ada9 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#37 0x0000003837dc94dc in QApplication::exec () at kernel/qapplication.cpp:3823
#38 0x0000003b9603d974 in kdemain (argc=1, argv=0x7fff01f57908) at /usr/src/debug/kde-workspace-4.11.13/plasma/desktop/shell/main.cpp:126
#39 0x000000382a821d65 in __libc_start_main (main=0x400940 <main(int, char**)>, argc=1, argv=0x7fff01f57908, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff01f578f8) at libc-start.c:285
#40 0x0000000000400971 in _start ()

Reported using DrKonqi