Application: lancelot (1.9.5)
KDE Platform Version: 4.11.5
Qt Version: 4.8.4
Operating System: Linux 3.11.0-18-generic x86_64
Distribution: Ubuntu 13.10

-- Information about the crash:
After searching lightscan, press return and Lancelot crash

The crash can be reproduced sometimes.

-- Backtrace:
Application: Lancelot (lancelot), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fcd2bd557c0 (LWP 3177))]

Thread 7 (Thread 0x7fcd0fe55700 (LWP 3178)):
#0  __GI___pthread_mutex_lock (mutex=0x7fcd08000a60) at pthread_mutex_lock.c:116
#1  0x00007fcd1f8eb3a1 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcd1f8aad59 in g_main_context_prepare () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcd1f8ab5c3 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007fcd1f8ab7ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fcd28845a76 in QEventDispatcherGlib::processEvents (this=0x7fcd080008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0x00007fcd288175ef in QEventLoop::processEvents (this=this@entry=0x7fcd0fe54d70, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007fcd288178e5 in QEventLoop::exec (this=this@entry=0x7fcd0fe54d70, flags=...) at kernel/qeventloop.cpp:204
#8  0x00007fcd2871688f in QThread::exec (this=this@entry=0x103e140) at thread/qthread.cpp:542
#9  0x00007fcd287f8d13 in QInotifyFileSystemWatcherEngine::run (this=0x103e140) at io/qfilesystemwatcher_inotify.cpp:265
#10 0x00007fcd28718f2f in QThreadPrivate::start (arg=0x103e140) at thread/qthread_unix.cpp:338
#11 0x00007fcd201c4f6e in start_thread (arg=0x7fcd0fe55700) at pthread_create.c:311
#12 0x00007fcd280cc9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 6 (Thread 0x7fcd0f3b5700 (LWP 3179)):
#0  0x00007fcd1f8eb0ea in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fcd1f8eb399 in g_mutex_lock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcd1f8ab798 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcd28845a76 in QEventDispatcherGlib::processEvents (this=0x7fcd000008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fcd288175ef in QEventLoop::processEvents (this=this@entry=0x7fcd0f3b4d70, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fcd288178e5 in QEventLoop::exec (this=this@entry=0x7fcd0f3b4d70, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fcd2871688f in QThread::exec (this=this@entry=0x11b90b0) at thread/qthread.cpp:542
#7  0x00007fcd287f8d13 in QInotifyFileSystemWatcherEngine::run (this=0x11b90b0) at io/qfilesystemwatcher_inotify.cpp:265
#8  0x00007fcd28718f2f in QThreadPrivate::start (arg=0x11b90b0) at thread/qthread_unix.cpp:338
#9  0x00007fcd201c4f6e in start_thread (arg=0x7fcd0f3b5700) at pthread_create.c:311
#10 0x00007fcd280cc9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 5 (Thread 0x7fccedbc7700 (LWP 5298)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fcd28719406 in wait (time=18446744073709551615, this=0x137eeb0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x14a5818, mutex=0x13a61d0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fcd23437e6c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x14a57f0, th=0x11cece0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x00007fcd2343a903 in ThreadWeaver::WorkingHardState::applyForWork (this=0x137cd70, th=0x11cece0, previous=0x1a55630) at ../../../threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x00007fcd2343961f in ThreadWeaver::Thread::run (this=0x11cece0) at ../../../threadweaver/Weaver/Thread.cpp:98
#6  0x00007fcd28718f2f in QThreadPrivate::start (arg=0x11cece0) at thread/qthread_unix.cpp:338
#7  0x00007fcd201c4f6e in start_thread (arg=0x7fccedbc7700) at pthread_create.c:311
#8  0x00007fcd280cc9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 4 (Thread 0x7fcce53c6700 (LWP 5299)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fcd28719406 in wait (time=18446744073709551615, this=0x137eeb0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x14a5818, mutex=0x13a61d0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fcd23437e6c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x14a57f0, th=0x1a66b90) at ../../../threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x00007fcd2343a903 in ThreadWeaver::WorkingHardState::applyForWork (this=0x137cd70, th=0x1a66b90, previous=0x1532610) at ../../../threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x00007fcd2343961f in ThreadWeaver::Thread::run (this=0x1a66b90) at ../../../threadweaver/Weaver/Thread.cpp:98
#6  0x00007fcd28718f2f in QThreadPrivate::start (arg=0x1a66b90) at thread/qthread_unix.cpp:338
#7  0x00007fcd201c4f6e in start_thread (arg=0x7fcce53c6700) at pthread_create.c:311
#8  0x00007fcd280cc9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7fcced3c6700 (LWP 5300)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fcd28719406 in wait (time=18446744073709551615, this=0x137eeb0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x14a5818, mutex=0x13a61d0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fcd23437e6c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x14a57f0, th=0x17088b0) at ../../../threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x00007fcd2343a903 in ThreadWeaver::WorkingHardState::applyForWork (this=0x137cd70, th=0x17088b0, previous=0x1a5ac90) at ../../../threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x00007fcd2343961f in ThreadWeaver::Thread::run (this=0x17088b0) at ../../../threadweaver/Weaver/Thread.cpp:98
#6  0x00007fcd28718f2f in QThreadPrivate::start (arg=0x17088b0) at thread/qthread_unix.cpp:338
#7  0x00007fcd201c4f6e in start_thread (arg=0x7fcced3c6700) at pthread_create.c:311
#8  0x00007fcd280cc9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fccecbc5700 (LWP 5301)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fcd28719406 in wait (time=18446744073709551615, this=0x137eeb0) at thread/qwaitcondition_unix.cpp:86
#2  QWaitCondition::wait (this=this@entry=0x14a5818, mutex=0x13a61d0, time=time@entry=18446744073709551615) at thread/qwaitcondition_unix.cpp:158
#3  0x00007fcd23437e6c in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0x14a57f0, th=0xe82c20) at ../../../threadweaver/Weaver/WeaverImpl.cpp:370
#4  0x00007fcd2343a903 in ThreadWeaver::WorkingHardState::applyForWork (this=0x137cd70, th=0xe82c20, previous=0x1a5c650) at ../../../threadweaver/Weaver/WorkingHardState.cpp:68
#5  0x00007fcd2343961f in ThreadWeaver::Thread::run (this=0xe82c20) at ../../../threadweaver/Weaver/Thread.cpp:98
#6  0x00007fcd28718f2f in QThreadPrivate::start (arg=0xe82c20) at thread/qthread_unix.cpp:338
#7  0x00007fcd201c4f6e in start_thread (arg=0x7fccecbc5700) at pthread_create.c:311
#8  0x00007fcd280cc9cd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7fcd2bd557c0 (LWP 3177)):
[KCrash Handler]
#6  QReadWriteLock::~QReadWriteLock (this=0x25, __in_chrg=<optimized out>) at thread/qreadwritelock.cpp:137
#7  0x00007fcd2b36957d in ~QueryMatchPrivate (this=<optimized out>, __in_chrg=<optimized out>) at ../../plasma/querymatch.cpp:72
#8  ~QSharedDataPointer (this=<optimized out>, __in_chrg=<optimized out>) at /usr/include/qt4/QtCore/qshareddata.h:90
#9  Plasma::QueryMatch::~QueryMatch (this=0x25, __in_chrg=<optimized out>) at ../../plasma/querymatch.cpp:100
#10 0x00007fcd2b378c7f in Plasma::RunnerManager::run (this=0x1374970, id=...) at ../../plasma/runnermanager.cpp:598
#11 0x00007fcd2ab2709f in Lancelot::Models::Runner::activate (this=0x12e01b0, index=<optimized out>) at ../../../libs/lancelot-datamodels/Runner.cpp:210
#12 0x00007fcd2ad9ce84 in Lancelot::ActionListModel::activated (this=0x12e01b0, index=index@entry=0) at ../../../libs/lancelot/models/ActionListModel.cpp:86
#13 0x00007fcd2ad861db in Lancelot::ActionListViewItemFactory::activate (this=0x1162940, index=0) at ../../../libs/lancelot/widgets/ActionListView.cpp:381
#14 0x00007fcd2ad88f85 in Lancelot::ActionListView::keyPressEvent (this=0x1081a50, event=<optimized out>) at ../../../libs/lancelot/widgets/ActionListView.cpp:1132
#15 0x000000000041612e in sendKeyEvent (event=0x7fff2c304870, this=0xf540d0) at /usr/include/qt4/QtCore/qstring.h:880
#16 LancelotWindow::eventFilter (this=0xf540d0, object=0xf540d0, event=0x7fff2c304870) at ../../../../applets/lancelot/application/LancelotWindow.cpp:832
#17 0x00007fcd28818a26 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0xeab260, receiver=receiver@entry=0xf540d0, event=event@entry=0x7fff2c304870) at kernel/qcoreapplication.cpp:1056
#18 0x00007fcd28fc3ddc in QApplicationPrivate::notify_helper (this=this@entry=0xeab260, receiver=receiver@entry=0xf540d0, e=e@entry=0x7fff2c304870) at kernel/qapplication.cpp:4563
#19 0x00007fcd28fcb6c1 in QApplication::notify (this=this@entry=0xe7e1d0, receiver=receiver@entry=0xf540d0, e=e@entry=0x7fff2c304870) at kernel/qapplication.cpp:4008
#20 0x00007fcd2a18ea6a in KApplication::notify (this=0xe7e1d0, receiver=0xf540d0, event=0x7fff2c304870) at ../../kdeui/kernel/kapplication.cpp:311
#21 0x00007fcd288188bd in QCoreApplication::notifyInternal (this=0xe7e1d0, receiver=receiver@entry=0xf540d0, event=event@entry=0x7fff2c304870) at kernel/qcoreapplication.cpp:946
#22 0x00007fcd28fc2526 in sendSpontaneousEvent (event=event@entry=0x7fff2c304870, receiver=receiver@entry=0xf540d0) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:234
#23 qt_sendSpontaneousEvent (receiver=receiver@entry=0xf540d0, event=event@entry=0x7fff2c304870) at kernel/qapplication.cpp:5565
#24 0x00007fcd29062e19 in QKeyMapper::sendKeyEvent (keyWidget=keyWidget@entry=0xf540d0, grab=grab@entry=false, type=QEvent::KeyPress, code=16777220, modifiers=..., text=..., autorepeat=autorepeat@entry=false, count=1, nativeScanCode=36, nativeVirtualKey=65293, nativeModifiers=16) at kernel/qkeymapper_x11.cpp:1866
#25 0x00007fcd290631b9 in QKeyMapperPrivate::translateKeyEvent (this=0xee67c0, keyWidget=keyWidget@entry=0xf540d0, event=event@entry=0x7fff2c304e00, grab=grab@entry=false) at kernel/qkeymapper_x11.cpp:1836
#26 0x00007fcd2903d207 in QApplication::x11ProcessEvent (this=0xe7e1d0, event=event@entry=0x7fff2c304e00) at kernel/qapplication_x11.cpp:3639
#27 0x00007fcd29065922 in x11EventSourceDispatch (s=0xea9480, callback=0x0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#28 0x00007fcd1f8ab3b6 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#29 0x00007fcd1f8ab708 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#30 0x00007fcd1f8ab7ac in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#31 0x00007fcd28845a55 in QEventDispatcherGlib::processEvents (this=0xe3fad0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#32 0x00007fcd290659d6 in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#33 0x00007fcd288175ef in QEventLoop::processEvents (this=this@entry=0x7fff2c3051e0, flags=...) at kernel/qeventloop.cpp:149
#34 0x00007fcd288178e5 in QEventLoop::exec (this=this@entry=0x7fff2c3051e0, flags=...) at kernel/qeventloop.cpp:204
#35 0x00007fcd2881ce5b in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#36 0x00007fcd28fc234c in QApplication::exec () at kernel/qapplication.cpp:3828
#37 0x000000000040cde3 in LancelotApplication::main (argc=<optimized out>, argv=<optimized out>) at ../../../../applets/lancelot/application/LancelotApplication.cpp:113
#38 0x00007fcd27ff3de5 in __libc_start_main (main=0x40cc90 <main(int, char**)>, argc=1, ubp_av=0x7fff2c305348, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff2c305338) at libc-start.c:260
#39 0x000000000040ce17 in _start ()

The reporter indicates this bug may be a duplicate of or related to bug 295033.

Possible duplicates by query: bug 330712, bug 326349, bug 324833, bug 324369, bug 320173.

Reported using DrKonqi