Bug 272764

Summary: Sometimes Lancelot Segmentation Fault with LibQtCore4.
Product: [Unmaintained] plasma4 Reporter: margueritesu <i>
Component: widget-lancelotAssignee: Ivan Čukić <ivan.cukic>
Status: RESOLVED UNMAINTAINED    
Severity: crash CC: basosergiou, dva.lider, hrvoje.senjan, milovan.krivokapic, obo2, smo1704, Sroka.Steven, thefugetive, timkhan85
Priority: NOR    
Version: 4.11.3   
Target Milestone: ---   
Platform: openSUSE   
OS: Linux   
Latest Commit: Version Fixed In:
Sentry Crash Report:
Attachments: New crash information added by DrKonqi
New crash information added by DrKonqi

Description margueritesu 2011-05-08 10:57:34 UTC 
Application: lancelot (1.9.5)
KDE Platform Version: 4.6.41 (4.7 >= 20110106) "release 1"
Qt Version: 4.7.2
Operating System: Linux 2.6.37.3-16-desktop x86_64
Distribution: "openSUSE 11.5 Milestone 0 (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:
Lancelot has a feature allows you to open application without click. just hover the mouse on the arrow before application icon. here is the problem.
Sometimes I did this, Lancelot crashes, sometimes it can be restarted automatically, sometimes It freezes and causes CPU useage 30% or more, you have to mannually  terminate the PID.

About Custom Settings
I am truly not sure if it is corralated with custom settings, for I have used this machine for about a year. 
Today I installed Adobe AIR 2 rpm and crash starts by entering 'Application' - 'Utilities' - ' More Programs', just starts the minute when father menu switch to child menu, when maybe the mouse accidently hovers on the arrow but then hovers out in a flash.
But I am sure it is not AIR problem, for I saw crashes long before it is installed. Just raise an example to make clear the way it crashes.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Lancelot (lancelot), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f458df5b7a0 (LWP 24517))]

Thread 6 (Thread 0x7f45730cb700 (LWP 24518)):
#0  0x00007f4586f7a0a4 in pthread_mutex_lock () from /lib64/libpthread.so.0
#1  0x00007f45807805a8 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#2  0x00007f458b6e5286 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#3  0x00007f458b6b98d2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#4  0x00007f458b6b9ae5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#5  0x00007f458b5ce7a4 in QThread::exec() () from /usr/lib64/libQtCore.so.4
#6  0x00007f458b69b008 in ?? () from /usr/lib64/libQtCore.so.4
#7  0x00007f458b5d1095 in ?? () from /usr/lib64/libQtCore.so.4
#8  0x00007f4586f77a3f in start_thread () from /lib64/libpthread.so.0
#9  0x00007f458a31567d in clone () from /lib64/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 5 (Thread 0x7f456c4b3700 (LWP 24542)):
#0  0x00007f4586f7c38c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f458b5d177b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x00007f45842fdf64 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0xb66590, th=0x10f1010) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WeaverImpl.cpp:365
#3  0x00007f4584300663 in ThreadWeaver::WorkingHardState::applyForWork (this=0xa5e8f0, th=0x10f1010) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WorkingHardState.cpp:71
#4  0x00007f45842ff43f in ThreadWeaver::ThreadRunHelper::run (this=0x7f456c4b2df0, parent=0xb66590, th=0x10f1010) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:87
#5  0x00007f45842ff4c8 in ThreadWeaver::Thread::run (this=0x10f1010) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:142
#6  0x00007f458b5d1095 in ?? () from /usr/lib64/libQtCore.so.4
#7  0x00007f4586f77a3f in start_thread () from /lib64/libpthread.so.0
#8  0x00007f458a31567d in clone () from /lib64/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f455eda6700 (LWP 24543)):
#0  0x00007f4586f7c38c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f458b5d177b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x00007f45842fdf64 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0xb66590, th=0x10f0d20) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WeaverImpl.cpp:365
#3  0x00007f4584300663 in ThreadWeaver::WorkingHardState::applyForWork (this=0xa5e8f0, th=0x10f0d20) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WorkingHardState.cpp:71
#4  0x00007f458430067c in ThreadWeaver::WorkingHardState::applyForWork (this=0xa5e8f0, th=0x10f0d20) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WorkingHardState.cpp:74
#5  0x00007f45842ff43f in ThreadWeaver::ThreadRunHelper::run (this=0x7f455eda5df0, parent=0xb66590, th=0x10f0d20) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:87
#6  0x00007f45842ff4c8 in ThreadWeaver::Thread::run (this=0x10f0d20) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:142
#7  0x00007f458b5d1095 in ?? () from /usr/lib64/libQtCore.so.4
#8  0x00007f4586f77a3f in start_thread () from /lib64/libpthread.so.0
#9  0x00007f458a31567d in clone () from /lib64/libc.so.6
#10 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f455e5a5700 (LWP 24544)):
#0  0x00007f4586f7c38c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f458b5d177b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x00007f45842fdf64 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0xb66590, th=0x10f0700) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WeaverImpl.cpp:365
#3  0x00007f4584300663 in ThreadWeaver::WorkingHardState::applyForWork (this=0xa5e8f0, th=0x10f0700) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WorkingHardState.cpp:71
#4  0x00007f45842ff43f in ThreadWeaver::ThreadRunHelper::run (this=0x7f455e5a4df0, parent=0xb66590, th=0x10f0700) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:87
#5  0x00007f45842ff4c8 in ThreadWeaver::Thread::run (this=0x10f0700) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:142
#6  0x00007f458b5d1095 in ?? () from /usr/lib64/libQtCore.so.4
#7  0x00007f4586f77a3f in start_thread () from /lib64/libpthread.so.0
#8  0x00007f458a31567d in clone () from /lib64/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f455dda4700 (LWP 24545)):
#0  0x00007f4586f7c38c in pthread_cond_wait@@GLIBC_2.3.2 () from /lib64/libpthread.so.0
#1  0x00007f458b5d177b in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/libQtCore.so.4
#2  0x00007f45842fdf64 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned (this=0xb66590, th=0x10effe0) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WeaverImpl.cpp:365
#3  0x00007f4584300663 in ThreadWeaver::WorkingHardState::applyForWork (this=0xa5e8f0, th=0x10effe0) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/WorkingHardState.cpp:71
#4  0x00007f45842ff43f in ThreadWeaver::ThreadRunHelper::run (this=0x7f455dda3df0, parent=0xb66590, th=0x10effe0) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:87
#5  0x00007f45842ff4c8 in ThreadWeaver::Thread::run (this=0x10effe0) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/threadweaver/Weaver/Thread.cpp:142
#6  0x00007f458b5d1095 in ?? () from /usr/lib64/libQtCore.so.4
#7  0x00007f4586f77a3f in start_thread () from /lib64/libpthread.so.0
#8  0x00007f458a31567d in clone () from /lib64/libc.so.6
#9  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f458df5b7a0 (LWP 24517)):
[KCrash Handler]
#6  0x00007f458d574959 in Plasma::KineticScrolling::eventFilter (this=0x10b0ac0, watched=<optimized out>, event=0x110a330) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/plasma/private/kineticscroll.cpp:394
#7  0x00007f458b6ba607 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#8  0x00007f458aa82111 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#9  0x00007f458aa8a6fa in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#10 0x00007f458c365a26 in KApplication::notify (this=0x663160, receiver=0xfebf30, event=0x110a330) at /usr/src/packages/BUILD/kdelibs-4.6.41_20110423/kdeui/kernel/kapplication.cpp:311
#11 0x00007f458b6ba47c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#12 0x00007f458b6bdc75 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQtCore.so.4
#13 0x00007f458b6e5093 in ?? () from /usr/lib64/libQtCore.so.4
#14 0x00007f458077fb43 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#15 0x00007f4580780320 in ?? () from /lib64/libglib-2.0.so.0
#16 0x00007f45807805c0 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#17 0x00007f458b6e522f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#18 0x00007f458ab27bae in ?? () from /usr/lib64/libQtGui.so.4
#19 0x00007f458b6b98d2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#20 0x00007f458b6b9ae5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#21 0x00007f458b6bdf2b in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#22 0x000000000040e336 in _start ()

Possible duplicates by query: bug 263901, bug 261035, bug 258283, bug 253524, bug 252553.

Reported using DrKonqi
Comment 1 Ivan Čukić 2011-05-08 14:22:11 UTC 
It should have been fixed in libplasma.

Please try with the next pre-release and if it persists, confirm the bug.
Comment 2 Beat Wolf 2011-11-20 21:06:16 UTC 
*** Bug 278475 has been marked as a duplicate of this bug. ***
Comment 3 Beat Wolf 2011-11-20 21:06:20 UTC 
*** Bug 287042 has been marked as a duplicate of this bug. ***
Comment 4 Vas 2011-11-20 22:41:51 UTC 
Ok, when will this be released? I do not like using the default KDE launcher at all?
Comment 5 Aaron J. Seigo 2011-11-22 20:21:46 UTC 
*** Bug 287142 has been marked as a duplicate of this bug. ***
Comment 6 Aaron J. Seigo 2011-12-02 12:14:27 UTC 
*** Bug 287765 has been marked as a duplicate of this bug. ***
Comment 7 margueritesu 2012-03-10 03:12:41 UTC 
Upstream fixed in libplasma. It has been so long, I can't remember which version. just mark it fixed.
Comment 8 Jekyll Wu 2012-03-14 05:37:21 UTC 
*** Bug 295976 has been marked as a duplicate of this bug. ***
Comment 9 Hrvoje Senjan 2013-07-19 20:16:37 UTC 
Created attachment 81205 [details]
New crash information added by DrKonqi

lancelot (1.9.5) on KDE Platform 4.10.95 using Qt 4.8.5

- What I was doing when the application crashed:

Added lancelot to desktop, scrolled a bit, removed the applet -> crash

-- Backtrace (Reduced):
#6  0x00007f090d3e8c96 in Plasma::KineticScrolling::eventFilter (this=0x1c8d170, watched=<optimized out>, event=0x19e8240) at /usr/src/debug/kdeplasma-addons-4.10.95/libs/lancelot/widgets/kineticscroll.cpp:394
#7  0x00007f090ae3d706 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0x17e7700, event=0x19e8240) at kernel/qcoreapplication.cpp:1059
#8  0x00007f090b5fe8dc in QApplicationPrivate::notify_helper (this=this@entry=0x109f2c0, receiver=receiver@entry=0x17e7700, e=e@entry=0x19e8240) at kernel/qapplication.cpp:4558
#9  0x00007f090b604ec0 in QApplication::notify (this=0x1067040, receiver=0x17e7700, e=0x19e8240) at kernel/qapplication.cpp:4348
#10 0x00007f090c7e30ca in KApplication::notify (this=0x1067040, receiver=0x17e7700, event=0x19e8240) at /usr/src/debug/kdelibs-4.10.95/kdeui/kernel/kapplication.cpp:311
Comment 10 Jekyll Wu 2013-12-12 09:28:58 UTC 
*** Bug 328707 has been marked as a duplicate of this bug. ***
Comment 11 dva.lider 2014-01-18 07:56:45 UTC 
Created attachment 84713 [details]
New crash information added by DrKonqi

lancelot (1.9.5) on KDE Platform 4.12.0 using Qt 4.8.4

Application: Lancelot (lancelot), signal: Segmentation fault
Using host libthread_db library "/lib/i386-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0xaf10c980 (LWP 1894))]

Thread 3 (Thread 0xac7fdb40 (LWP 1895)):
#0  0xb2448ddf in __GI___pthread_mutex_lock (mutex=0xabe00570) at pthread_mutex_lock.c:95
#1  0xb5999bc4 in pthread_mutex_lock (mutex=0xabe00570) at forward.c:192
#2  0xb236bbb0 in g_mutex_lock () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2328c91 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb5cdd8df in QEventDispatcherGlib::processEvents (this=0xabe00480, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#5  0xb5cac9f3 in QEventLoop::processEvents (this=this@entry=0xac7fd228, flags=...) at kernel/qeventloop.cpp:149
#6  0xb5cacd19 in QEventLoop::exec (this=this@entry=0xac7fd228, flags=...) at kernel/qeventloop.cpp:204
#7  0xb5b9be3d in QThread::exec (this=this@entry=0x8816100) at thread/qthread.cpp:542
#8  0xb5c8ce14 in QInotifyFileSystemWatcherEngine::run (this=0x8816100) at io/qfilesystemwatcher_inotify.cpp:265
#9  0xb5b9e72f in QThreadPrivate::start (arg=0x8816100) at thread/qthread_unix.cpp:338
#10 0xb2446d78 in start_thread (arg=0xac7fdb40) at pthread_create.c:311
#11 0xb598c01e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131

Thread 2 (Thread 0xabaedb40 (LWP 1896)):
#0  0xb236b86e in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#1  0xb236bba8 in g_mutex_lock () from /lib/i386-linux-gnu/libglib-2.0.so.0
#2  0xb2327cd6 in g_main_context_release () from /lib/i386-linux-gnu/libglib-2.0.so.0
#3  0xb2328b10 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#4  0xb2328ca8 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#5  0xb5cdd8df in QEventDispatcherGlib::processEvents (this=0xab100480, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#6  0xb5cac9f3 in QEventLoop::processEvents (this=this@entry=0xabaed228, flags=...) at kernel/qeventloop.cpp:149
#7  0xb5cacd19 in QEventLoop::exec (this=this@entry=0xabaed228, flags=...) at kernel/qeventloop.cpp:204
#8  0xb5b9be3d in QThread::exec (this=this@entry=0x8a0f418) at thread/qthread.cpp:542
#9  0xb5c8ce14 in QInotifyFileSystemWatcherEngine::run (this=0x8a0f418) at io/qfilesystemwatcher_inotify.cpp:265
#10 0xb5b9e72f in QThreadPrivate::start (arg=0x8a0f418) at thread/qthread_unix.cpp:338
#11 0xb2446d78 in start_thread (arg=0xabaedb40) at pthread_create.c:311
#12 0xb598c01e in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:131

Thread 1 (Thread 0xaf10c980 (LWP 1894)):
[KCrash Handler]
#7  0xb71d2d22 in Plasma::KineticScrolling::eventFilter (this=0x8b52f78, watched=0x93a6898, event=0x93ea0c8) at ../../../libs/lancelot/widgets/kineticscroll.cpp:394
#8  0xb5cae04e in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x86ac178, receiver=receiver@entry=0x93a6898, event=event@entry=0x93ea0c8) at kernel/qcoreapplication.cpp:1056
#9  0xb5fd2721 in QApplicationPrivate::notify_helper (this=0x86ac178, receiver=0x93a6898, e=0x93ea0c8) at kernel/qapplication.cpp:4563
#10 0xb5fd9223 in QApplication::notify (this=0x86761b0, receiver=receiver@entry=0x93a6898, e=e@entry=0x93ea0c8) at kernel/qapplication.cpp:4353
#11 0xb6dd3164 in KApplication::notify (this=0x86761b0, receiver=0x93a6898, event=0x93ea0c8) at ../../kdeui/kernel/kapplication.cpp:311
#12 0xb5cadeda in QCoreApplication::notifyInternal (this=0x86761b0, receiver=receiver@entry=0x93a6898, event=event@entry=0x93ea0c8) at kernel/qcoreapplication.cpp:946
#13 0xb5cb16ad in sendEvent (event=0x93ea0c8, receiver=0x93a6898) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:231
#14 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, data=0x85f2130) at kernel/qcoreapplication.cpp:1570
#15 0xb5cb1bbc in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1463
#16 0xb5cddf6e in sendPostedEvents () at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:236
#17 postEventSourceDispatch (s=0x86abe48) at kernel/qeventdispatcher_glib.cpp:279
#18 0xb232883e in g_main_context_dispatch () from /lib/i386-linux-gnu/libglib-2.0.so.0
#19 0xb2328be8 in ?? () from /lib/i386-linux-gnu/libglib-2.0.so.0
#20 0xb2328ca8 in g_main_context_iteration () from /lib/i386-linux-gnu/libglib-2.0.so.0
#21 0xb5cdd8bf in QEventDispatcherGlib::processEvents (this=this@entry=0x85f2ec0, flags=...) at kernel/qeventdispatcher_glib.cpp:424
#22 0xb608732e in QGuiEventDispatcherGlib::processEvents (this=0x85f2ec0, flags=...) at kernel/qguieventdispatcher_glib.cpp:204
#23 0xb5cac9f3 in QEventLoop::processEvents (this=this@entry=0xbfc78558, flags=...) at kernel/qeventloop.cpp:149
#24 0xb5cacd19 in QEventLoop::exec (this=this@entry=0xbfc78558, flags=...) at kernel/qeventloop.cpp:204
#25 0xb5cb289e in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1218
#26 0xb5fd0974 in QApplication::exec () at kernel/qapplication.cpp:3828
#27 0x08052084 in LancelotApplication::main (argc=argc@entry=1, argv=argv@entry=0xbfc786a4) at ../../../../applets/lancelot/application/LancelotApplication.cpp:113
#28 0x08051f0b in main (argc=1, argv=0xbfc786a4) at ../../../../applets/lancelot/application/main.cpp:24

-- Backtrace (Reduced):
#7  0xb71d2d22 in Plasma::KineticScrolling::eventFilter (this=0x8b52f78, watched=0x93a6898, event=0x93ea0c8) at ../../../libs/lancelot/widgets/kineticscroll.cpp:394
#8  0xb5cae04e in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=this@entry=0x86ac178, receiver=receiver@entry=0x93a6898, event=event@entry=0x93ea0c8) at kernel/qcoreapplication.cpp:1056
#9  0xb5fd2721 in QApplicationPrivate::notify_helper (this=0x86ac178, receiver=0x93a6898, e=0x93ea0c8) at kernel/qapplication.cpp:4563
#10 0xb5fd9223 in QApplication::notify (this=0x86761b0, receiver=receiver@entry=0x93a6898, e=e@entry=0x93ea0c8) at kernel/qapplication.cpp:4353
#11 0xb6dd3164 in KApplication::notify (this=0x86761b0, receiver=0x93a6898, event=0x93ea0c8) at ../../kdeui/kernel/kapplication.cpp:311
Comment 12 Ivan Čukić 2014-05-22 20:51:43 UTC 
Can you update to 4.13?
Comment 13 Ivan Čukić 2014-05-22 20:52:12 UTC 
(the crash is in kinetic scrolling of plasma)
Comment 14 Christoph Feck 2015-01-14 15:48:43 UTC 
We are still getting crashes from recent versions.
Comment 15 Christoph Feck 2015-01-14 15:49:05 UTC 
*** Bug 342805 has been marked as a duplicate of this bug. ***
Comment 16 Ivan Čukić 2015-05-02 13:23:30 UTC 
Lancelot for Plasma 4 is unmaintained.