Application: lancelot (1.9.5)
KDE Platform Version: 4.7.2 (4.7.2) "release 5"
Qt Version: 4.7.4
Operating System: Linux 3.1.0-1.2-desktop x86_64
Distribution: "openSUSE 12.1 (x86_64)"

-- Information about the crash:
- What I was doing when the application crashed:
when I click on subtree of Applications (example: Graphics) and then I click its parent tree (in this case Applications), Lancelot always crash. I can keep entering into subtrees, but every time I return to its parent tree or any other "higher level" trees, crash happens. 

openSUSE 12.1
KDE 4.7.2 release 5

The crash can be reproduced every time.

-- Backtrace:
Application: Lancelot (lancelot), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f6594d8e7a0 (LWP 2436))]

Thread 2 (Thread 0x7f657a3a8700 (LWP 2464)):
#0  0x00007f658f79411f in __pthread_mutex_unlock_usercnt () from /lib64/libpthread.so.0
#1  0x00007f6588992a8c in ?? () from /usr/lib64/libglib-2.0.so.0
#2  0x00007f6588992f59 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x00007f65924b5576 in QEventDispatcherGlib::processEvents (this=0x9929f0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f6592489a22 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f6592489c1f in QEventLoop::exec (this=0x7f657a3a7cf0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f65923a15df in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f659246caef in QInotifyFileSystemWatcherEngine::run (this=0xaa5d90) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f65923a4025 in QThreadPrivate::start (arg=0xaa5d90) at thread/qthread_unix.cpp:331
#9  0x00007f658491a25a in ?? () from /usr/X11R6/lib64/libGL.so.1
#10 0x00007f658f790f05 in start_thread () from /lib64/libpthread.so.0
#11 0x00007f65910c953d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f6594d8e7a0 (LWP 2436)):
[KCrash Handler]
#6  0x00007f6593d6e9d9 in Plasma::KineticScrolling::eventFilter (this=0xf81ca0, watched=<optimized out>, event=0xf751c0) at /usr/src/debug/kdeplasma-addons-4.7.2/libs/lancelot/widgets/kineticscroll.cpp:394
#7  0x00007f659248a9a8 in QCoreApplicationPrivate::sendThroughObjectEventFilters (this=<optimized out>, receiver=0xf71b10, event=0xf751c0) at kernel/qcoreapplication.cpp:902
#8  0x00007f6591859baf in notify_helper (e=0xf751c0, receiver=0xf71b10, this=0x6cd250) at kernel/qapplication.cpp:4477
#9  QApplicationPrivate::notify_helper (this=0x6cd250, receiver=0xf71b10, e=0xf751c0) at kernel/qapplication.cpp:4453
#10 0x00007f659185ea71 in QApplication::notify (this=0x6affa0, receiver=0xf71b10, e=0xf751c0) at kernel/qapplication.cpp:4360
#11 0x00007f6593153e36 in KApplication::notify (this=0x6affa0, receiver=0xf71b10, event=0xf751c0) at /usr/src/debug/kdelibs-4.7.2/kdeui/kernel/kapplication.cpp:311
#12 0x00007f659248a81c in QCoreApplication::notifyInternal (this=0x6affa0, receiver=0xf71b10, event=0xf751c0) at kernel/qcoreapplication.cpp:787
#13 0x00007f659248dbf8 in sendEvent (event=0xf751c0, receiver=0xf71b10) at kernel/qcoreapplication.h:215
#14 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0x6310f0) at kernel/qcoreapplication.cpp:1428
#15 0x00007f65924b50b3 in sendPostedEvents () at kernel/qcoreapplication.h:220
#16 postEventSourceDispatch (s=<optimized out>) at kernel/qeventdispatcher_glib.cpp:277
#17 0x00007f658899258d in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#18 0x00007f6588992d88 in ?? () from /usr/lib64/libglib-2.0.so.0
#19 0x00007f6588992f59 in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#20 0x00007f65924b550f in QEventDispatcherGlib::processEvents (this=0x6308d0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#21 0x00007f65918fcf2e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#22 0x00007f6592489a22 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#23 0x00007f6592489c1f in QEventLoop::exec (this=0x7fff46e45ce0, flags=...) at kernel/qeventloop.cpp:201
#24 0x00007f659248dde7 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#25 0x000000000040d90d in LancelotApplication::main (argc=<optimized out>, argv=<optimized out>) at /usr/src/debug/kdeplasma-addons-4.7.2/applets/lancelot/application/LancelotApplication.cpp:113
#26 0x00007f659101123d in __libc_start_main () from /lib64/libc.so.6
#27 0x000000000040d941 in _start () at ../sysdeps/x86_64/elf/start.S:113

This bug may be a duplicate of or related to bug 278475.

Possible duplicates by query: bug 287042, bug 278475, bug 272764, bug 263901, bug 261035.

Reported using DrKonqi