Application: kactivitymanagerd (3.0)
KDE Platform Version: 4.10.95 (Compiled from sources)
Qt Version: 4.8.4
Operating System: Linux 3.10.0-2-generic x86_64
Distribution: Ubuntu Saucy Salamander (development branch)

-- Information about the crash:
- What I was doing when the application crashed:

Just change any activity name to null ( empty ) from show activity manager widget
and the  KDE Activity Manager  will crash. I think we need to check whether the input is empty or not before setting it as activity name

The crash can be reproduced every time.

-- Backtrace:
Application: KDE Activity Manager (kactivitymanagerd), signal: Aborted
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fbb4b9f27c0 (LWP 2144))]

Thread 6 (Thread 0x7fbb3a426700 (LWP 2153)):
#0  0x00007fbb45d75a1b in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fbb45d762b3 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb45d7649c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb4a5c1a76 in QEventDispatcherGlib::processEvents (this=0x7fbb340008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fbb4a5935ef in QEventLoop::processEvents (this=this@entry=0x7fbb3a425d80, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fbb4a5938e5 in QEventLoop::exec (this=this@entry=0x7fbb3a425d80, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fbb4a49288f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542
#7  0x000000000040d877 in Resources* runInQThread<Resources>()::Thread::run() (this=0xa71b60) at /home/usta/kde/src/kactivities/src/service/Application.cpp:68
#8  0x00007fbb4a494f2f in QThreadPrivate::start (arg=0xa71b60) at thread/qthread_unix.cpp:338
#9  0x00007fbb48e86f8e in start_thread (arg=0x7fbb3a426700) at pthread_create.c:311
#10 0x00007fbb49195e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7fbb39c25700 (LWP 2154)):
#0  0x00007fbb49187b0d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fbb45db5080 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb45d75ebc in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb45d7632b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fbb45d7649c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fbb4a5c1a76 in QEventDispatcherGlib::processEvents (this=0x7fbb2c0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fbb4a5935ef in QEventLoop::processEvents (this=this@entry=0x7fbb39c24d80, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fbb4a5938e5 in QEventLoop::exec (this=this@entry=0x7fbb39c24d80, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fbb4a49288f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542
#9  0x000000000040d97d in Activities* runInQThread<Activities>()::Thread::run() (this=0xae15b0) at /home/usta/kde/src/kactivities/src/service/Application.cpp:68
#10 0x00007fbb4a494f2f in QThreadPrivate::start (arg=0xae15b0) at thread/qthread_unix.cpp:338
#11 0x00007fbb48e86f8e in start_thread (arg=0x7fbb39c25700) at pthread_create.c:311
#12 0x00007fbb49195e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7fbb39424700 (LWP 2155)):
#0  0x00007fbb49187b0d in read () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fbb45db5080 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb45d75ebc in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb45d7632b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fbb45d7649c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fbb4a5c1a76 in QEventDispatcherGlib::processEvents (this=0x7fbb300008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fbb4a5935ef in QEventLoop::processEvents (this=this@entry=0x7fbb39423d80, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fbb4a5938e5 in QEventLoop::exec (this=this@entry=0x7fbb39423d80, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fbb4a49288f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542
#9  0x000000000040da83 in Features* runInQThread<Features>()::Thread::run() (this=0xae3240) at /home/usta/kde/src/kactivities/src/service/Application.cpp:68
#10 0x00007fbb4a494f2f in QThreadPrivate::start (arg=0xae3240) at thread/qthread_unix.cpp:338
#11 0x00007fbb48e86f8e in start_thread (arg=0x7fbb39424700) at pthread_create.c:311
#12 0x00007fbb49195e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7fbb257a2700 (LWP 2159)):
#0  0x00007fbb45db5afa in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fbb45db5da9 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb45d76488 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb4a5c1a76 in QEventDispatcherGlib::processEvents (this=0x7fbb200008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fbb4a5935ef in QEventLoop::processEvents (this=this@entry=0x7fbb257a1d80, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fbb4a5938e5 in QEventLoop::exec (this=this@entry=0x7fbb257a1d80, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fbb4a49288f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:542
#7  0x00007fbb2bbe2bbd in ActivityRankingPlugin::Thread::run (this=0xb399e0) at /home/usta/kde/src/kactivities/src/service/plugins/activityranking/ActivityRankingPlugin.cpp:54
#8  0x00007fbb4a494f2f in QThreadPrivate::start (arg=0xb399e0) at thread/qthread_unix.cpp:338
#9  0x00007fbb48e86f8e in start_thread (arg=0x7fbb257a2700) at pthread_create.c:311
#10 0x00007fbb49195e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fbb24fa1700 (LWP 2160)):
#0  0x00007fbb491893cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fbb45d76394 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fbb45d7649c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fbb4a5c1a76 in QEventDispatcherGlib::processEvents (this=0x7fbb180008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fbb4a5935ef in QEventLoop::processEvents (this=this@entry=0x7fbb24fa0d70, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fbb4a5938e5 in QEventLoop::exec (this=this@entry=0x7fbb24fa0d70, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fbb4a49288f in QThread::exec (this=this@entry=0xb40cc0) at thread/qthread.cpp:542
#7  0x00007fbb4a574d13 in QInotifyFileSystemWatcherEngine::run (this=0xb40cc0) at io/qfilesystemwatcher_inotify.cpp:256
#8  0x00007fbb4a494f2f in QThreadPrivate::start (arg=0xb40cc0) at thread/qthread_unix.cpp:338
#9  0x00007fbb48e86f8e in start_thread (arg=0x7fbb24fa1700) at pthread_create.c:311
#10 0x00007fbb49195e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7fbb4b9f27c0 (LWP 2144)):
[KCrash Handler]
#6  0x00007fbb490d3037 in __GI_raise (sig=sig@entry=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:56
#7  0x00007fbb490d6698 in __GI_abort () at abort.c:90
#8  0x00007fbb4a48a912 in qt_message_output (msgType=msgType@entry=QtFatalMsg, buf=0xae8678 "ASSERT: \"!name.isEmpty()\" in file /home/usta/kde/src/kactivities/src/service/plugins/nepomuk/NepomukPlugin.cpp, line 188") at global/qglobal.cpp:2347
#9  0x00007fbb4a48ac79 in qt_message(QtMsgType, const char *, typedef __va_list_tag __va_list_tag *) (msgType=msgType@entry=QtFatalMsg, msg=0x7fbb4a5f5a80 "ASSERT: \"%s\" in file %s, line %d", ap=ap@entry=0x7fffbee0dfd8) at global/qglobal.cpp:2393
#10 0x00007fbb4a48b484 in qFatal (msg=<optimized out>) at global/qglobal.cpp:2576
#11 0x00007fbb38684bf3 in NepomukPlugin::setActivityName (this=0xb20e10, activity=..., name=...) at /home/usta/kde/src/kactivities/src/service/plugins/nepomuk/NepomukPlugin.cpp:188
#12 0x00007fbb38683d8a in NepomukPlugin::qt_static_metacall (_o=0xb20e10, _c=QMetaObject::InvokeMetaMethod, _id=8, _a=0x7fbb2c005440) at /home/usta/kde/build/kactivities/src/service/plugins/nepomuk/moc_NepomukPlugin.cpp:101
#13 0x00007fbb4a5acdce in QObject::event (this=0xb20e10, e=<optimized out>) at kernel/qobject.cpp:1194
#14 0x00007fbb49931dfc in QApplicationPrivate::notify_helper (this=this@entry=0x986780, receiver=receiver@entry=0xb20e10, e=e@entry=0x7fbb2c0048a0) at kernel/qapplication.cpp:4567
#15 0x00007fbb49938470 in QApplication::notify (this=0x9703b0, receiver=0xb20e10, e=0x7fbb2c0048a0) at kernel/qapplication.cpp:4353
#16 0x00007fbb4adedf15 in KApplication::notify (this=0x9703b0, receiver=0xb20e10, event=0x7fbb2c0048a0) at /home/usta/kde/src/kdelibs/kdeui/kernel/kapplication.cpp:311
#17 0x00007fbb4a5948bd in QCoreApplication::notifyInternal (this=0x9703b0, receiver=receiver@entry=0xb20e10, event=event@entry=0x7fbb2c0048a0) at kernel/qcoreapplication.cpp:946
#18 0x00007fbb4a597e1f in sendEvent (event=0x7fbb2c0048a0, receiver=0xb20e10) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#19 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x957150) at kernel/qcoreapplication.cpp:1570
#20 0x00007fbb4a5982c3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1463
#21 0x00007fbb4a5c2073 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#22 postEventSourceDispatch (s=0x97e200) at kernel/qeventdispatcher_glib.cpp:279
#23 0x00007fbb45d760a6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fbb45d763f8 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#25 0x00007fbb45d7649c in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007fbb4a5c1a76 in QEventDispatcherGlib::processEvents (this=0x958610, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#27 0x00007fbb499d39d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#28 0x00007fbb4a5935ef in QEventLoop::processEvents (this=this@entry=0x7fffbee0e7a0, flags=...) at kernel/qeventloop.cpp:149
#29 0x00007fbb4a5938e5 in QEventLoop::exec (this=this@entry=0x7fffbee0e7a0, flags=...) at kernel/qeventloop.cpp:204
#30 0x00007fbb4a598e5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#31 0x000000000040cae9 in main (argc=1, argv=0x7fffbee0e9b8) at /home/usta/kde/src/kactivities/src/service/Application.cpp:236

Reported using DrKonqi