Application: kactivitymanagerd (3.0)
KDE Platform Version: 4.14.13
Qt Version: 4.8.6
Operating System: Linux 3.13.0-92-generic x86_64
Distribution: Ubuntu 14.04.4 LTS

-- Information about the crash:
- Unusual behavior I noticed:
it crashes from time to time I have not noticed at what circumstance it crashes

The crash can be reproduced sometimes.

-- Backtrace:
Application: KDE Activity Manager (kactivitymanagerd), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7efeda2e57c0 (LWP 3205))]

Thread 6 (Thread 0x7efec93f1700 (LWP 3214)):
#0  0x00007efed6f827de in __pthread_mutex_unlock_usercnt (decr=1, mutex=0x7efec4000a60) at pthread_mutex_unlock.c:57
#1  __GI___pthread_mutex_unlock (mutex=0x7efec4000a60) at pthread_mutex_unlock.c:310
#2  0x00007efed4c759b1 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007efed4c33680 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007efed4c33f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007efed4c340ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007efed904e7be in QEventDispatcherGlib::processEvents (this=0x7efec40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#7  0x00007efed90200af in QEventLoop::processEvents (this=this@entry=0x7efec93f0e10, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007efed90203a5 in QEventLoop::exec (this=this@entry=0x7efec93f0e10, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007efed8f1cc5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#10 0x000000000040a06a in ?? ()
#11 0x00007efed8f1f32f in QThreadPrivate::start (arg=0x9eb9b0) at thread/qthread_unix.cpp:349
#12 0x00007efed6f7f184 in start_thread (arg=0x7efec93f1700) at pthread_create.c:312
#13 0x00007efed7c2237d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 5 (Thread 0x7efec8bf0700 (LWP 3230)):
#0  0x00007efed6f827de in __pthread_mutex_unlock_usercnt (decr=1, mutex=0x7efeb8000a60) at pthread_mutex_unlock.c:57
#1  __GI___pthread_mutex_unlock (mutex=0x7efeb8000a60) at pthread_mutex_unlock.c:310
#2  0x00007efed4c759b1 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007efed4c33a59 in g_main_context_check () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007efed4c33f7b in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007efed4c340ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#6  0x00007efed904e7be in QEventDispatcherGlib::processEvents (this=0x7efeb80008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#7  0x00007efed90200af in QEventLoop::processEvents (this=this@entry=0x7efec8befe10, flags=...) at kernel/qeventloop.cpp:149
#8  0x00007efed90203a5 in QEventLoop::exec (this=this@entry=0x7efec8befe10, flags=...) at kernel/qeventloop.cpp:204
#9  0x00007efed8f1cc5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#10 0x000000000040a09a in ?? ()
#11 0x00007efed8f1f32f in QThreadPrivate::start (arg=0xa41810) at thread/qthread_unix.cpp:349
#12 0x00007efed6f7f184 in start_thread (arg=0x7efec8bf0700) at pthread_create.c:312
#13 0x00007efed7c2237d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 4 (Thread 0x7efec3fff700 (LWP 3231)):
#0  0x00007efed4c759b1 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007efed4c330f0 in g_main_context_acquire () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007efed4c33ea5 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007efed4c340ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007efed904e7be in QEventDispatcherGlib::processEvents (this=0x7efebc0008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#5  0x00007efed90200af in QEventLoop::processEvents (this=this@entry=0x7efec3ffee10, flags=...) at kernel/qeventloop.cpp:149
#6  0x00007efed90203a5 in QEventLoop::exec (this=this@entry=0x7efec3ffee10, flags=...) at kernel/qeventloop.cpp:204
#7  0x00007efed8f1cc5f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:537
#8  0x000000000040a0ca in ?? ()
#9  0x00007efed8f1f32f in QThreadPrivate::start (arg=0x9f3d60) at thread/qthread_unix.cpp:349
#10 0x00007efed6f7f184 in start_thread (arg=0x7efec3fff700) at pthread_create.c:312
#11 0x00007efed7c2237d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 3 (Thread 0x7efec2cdf700 (LWP 3232)):
#0  0x00007efed4c7561a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007efed4c759a9 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007efed4c33718 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007efed4c33f03 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007efed4c340ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007efed904e7be in QEventDispatcherGlib::processEvents (this=0x7efeb40008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:436
#6  0x00007efed90200af in QEventLoop::processEvents (this=this@entry=0x7efec2cdede0, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007efed90203a5 in QEventLoop::exec (this=this@entry=0x7efec2cdede0, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007efed8f1cc5f in QThread::exec (this=this@entry=0x8a1c50) at thread/qthread.cpp:537
#9  0x00007efed9001823 in QInotifyFileSystemWatcherEngine::run (this=0x8a1c50) at io/qfilesystemwatcher_inotify.cpp:265
#10 0x00007efed8f1f32f in QThreadPrivate::start (arg=0x8a1c50) at thread/qthread_unix.cpp:349
#11 0x00007efed6f7f184 in start_thread (arg=0x7efec2cdf700) at pthread_create.c:312
#12 0x00007efed7c2237d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 2 (Thread 0x7efec24de700 (LWP 3480)):
#0  pthread_cond_timedwait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_timedwait.S:238
#1  0x00007efed8f1df4a in thread_sleep (ti=ti@entry=0x7efec24ddd50) at thread/qthread_unix.cpp:492
#2  0x00007efed8f1e6d6 in QThread::sleep (secs=<optimized out>) at thread/qthread_unix.cpp:506
#3  0x00007efec35f86da in ?? () from /usr/lib/kde4/activitymanager_plugin_sqlite.so
#4  0x00007efed8f1f32f in QThreadPrivate::start (arg=0xa20ce0) at thread/qthread_unix.cpp:349
#5  0x00007efed6f7f184 in start_thread (arg=0x7efec24de700) at pthread_create.c:312
#6  0x00007efed7c2237d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:111

Thread 1 (Thread 0x7efeda2e57c0 (LWP 3205)):
[KCrash Handler]
#5  __memmove_ssse3 () at ../sysdeps/x86_64/multiarch/memcpy-ssse3.S:2814
#6  0x00007efed8f3c799 in memmove (__len=<optimized out>, __src=<optimized out>, __dest=<optimized out>) at /usr/include/x86_64-linux-gnu/bits/string3.h:57
#7  QListData::remove (this=this@entry=0xb0d098, i=<optimized out>, i@entry=1) at tools/qlist.cpp:347
#8  0x00007efec2fa29de in removeAt (i=1, this=0xb0d098) at ../../../../include/QtCore/../../src/corelib/tools/qlist.h:482
#9  QList<QSQLiteResult*>::removeOne (this=0xb0d098, _t=@0x7ffc897c8ba8: 0xa91470) at ../../../../include/QtCore/../../src/corelib/tools/qlist.h:800
#10 0x00007efec2fa2105 in QSQLiteResult::~QSQLiteResult (this=0xa91470, __in_chrg=<optimized out>) at ../../../sql/drivers/sqlite/qsql_sqlite.cpp:322
#11 0x00007efec2fa2189 in QSQLiteResult::~QSQLiteResult (this=0xa91470, __in_chrg=<optimized out>) at ../../../sql/drivers/sqlite/qsql_sqlite.cpp:325
#12 0x00007efec33c065e in QSqlQuery::~QSqlQuery (this=0xde6ff0, __in_chrg=<optimized out>) at kernel/qsqlquery.cpp:245
#13 0x00007efec35f41ee in ?? () from /usr/lib/kde4/activitymanager_plugin_sqlite.so
#14 0x00007efec35f65af in ?? () from /usr/lib/kde4/activitymanager_plugin_sqlite.so
#15 0x00007efed9039c1e in QObject::event (this=0xa2b910, e=<optimized out>) at kernel/qobject.cpp:1194
#16 0x00007efed83bae2c in QApplicationPrivate::notify_helper (this=this@entry=0x8b0ed0, receiver=receiver@entry=0xa2b910, e=e@entry=0x7efeb0001a40) at kernel/qapplication.cpp:4567
#17 0x00007efed83c14a0 in QApplication::notify (this=0x894440, receiver=0xa2b910, e=0x7efeb0001a40) at kernel/qapplication.cpp:4353
#18 0x00007efed982580a in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#19 0x00007efed90214dd in QCoreApplication::notifyInternal (this=0x894440, receiver=receiver@entry=0xa2b910, event=event@entry=0x7efeb0001a40) at kernel/qcoreapplication.cpp:953
#20 0x00007efed9024b3d in sendEvent (event=0x7efeb0001a40, receiver=0xa2b910) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#21 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x87b150) at kernel/qcoreapplication.cpp:1577
#22 0x00007efed9024fe3 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1470
#23 0x00007efed904ef83 in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#24 postEventSourceDispatch (s=0x8b4e70) at kernel/qeventdispatcher_glib.cpp:287
#25 0x00007efed4c33e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#26 0x00007efed4c34048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#27 0x00007efed4c340ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#28 0x00007efed904e7a1 in QEventDispatcherGlib::processEvents (this=0x87c630, flags=...) at kernel/qeventdispatcher_glib.cpp:434
#29 0x00007efed845cbe6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#30 0x00007efed90200af in QEventLoop::processEvents (this=this@entry=0x7ffc897c93e0, flags=...) at kernel/qeventloop.cpp:149
#31 0x00007efed90203a5 in QEventLoop::exec (this=this@entry=0x7ffc897c93e0, flags=...) at kernel/qeventloop.cpp:204
#32 0x00007efed9025b79 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1225
#33 0x00000000004067fb in ?? ()
#34 0x00007efed7b49f45 in __libc_start_main (main=0x406680, argc=1, argv=0x7ffc897c9608, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffc897c95f8) at libc-start.c:287
#35 0x0000000000406942 in _start ()

Reported using DrKonqi