Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.3 (4.7.3)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-14-generic x86_64
Distribution: Ubuntu 11.10

-- Information about the crash:
- What I was doing when the application crashed:
I downloaded a file, once it finished and moved to the Downloads folder, Rekonq crashed and Drkonqi popped up.

- Unusual behavior I noticed:
Just prior to the crash, desktop, panels and widgets are forced to refresh, which happens every time a download finishes.
This happens even if the file is saved to a folder that does not involve the desktop nor any of the widgets.
I also tried turning widgets off. Did not help. Rekonq still crashes when a downloads finishes (With the forced refresh of the desktop and panels).

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7fcfe089c7c0 (LWP 1886))]

Thread 4 (Thread 0x7fcfbc90d700 (LWP 1887)):
#0  0x00007fcfe016e773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fcfd46f8f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcfd46f9429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcfdd35ff3e in QEventDispatcherGlib::processEvents (this=0x1719200, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fcfdd333cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fcfdd333ef7 in QEventLoop::exec (this=0x7fcfbc90ccd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fcfdd24b27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fcfdd316cbf in QInotifyFileSystemWatcherEngine::run (this=0x1715e80) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fcfdd24dd05 in QThreadPrivate::start (arg=0x1715e80) at thread/qthread_unix.cpp:331
#9  0x00007fcfd1a1256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fcfd5205efc in start_thread (arg=0x7fcfbc90d700) at pthread_create.c:304
#11 0x00007fcfe017a89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7fcfb5fcb700 (LWP 1888)):
#0  0x00007fcfe016e773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fcfd46f8f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcfd46f9429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcfdd35ff3e in QEventDispatcherGlib::processEvents (this=0x192ed90, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007fcfdd333cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fcfdd333ef7 in QEventLoop::exec (this=0x7fcfb5fcacd0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007fcfdd24b27f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007fcfdd316cbf in QInotifyFileSystemWatcherEngine::run (this=0x192e150) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007fcfdd24dd05 in QThreadPrivate::start (arg=0x192e150) at thread/qthread_unix.cpp:331
#9  0x00007fcfd1a1256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#10 0x00007fcfd5205efc in start_thread (arg=0x7fcfb5fcb700) at pthread_create.c:304
#11 0x00007fcfe017a89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7fcfb2d7c700 (LWP 1894)):
#0  0x00007fcfe016e773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007fcfd46f8f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fcfd46f9792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fcfb385a516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007fcfd471e2b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007fcfd1a1256c in ?? () from /usr/lib/nvidia-current/libGL.so.1
#6  0x00007fcfd5205efc in start_thread (arg=0x7fcfb2d7c700) at pthread_create.c:304
#7  0x00007fcfe017a89d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#8  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fcfe089c7c0 (LWP 1886)):
[KCrash Handler]
#6  isNull (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:568
#7  operator! (this=0x0) at /usr/include/qt4/QtCore/qsharedpointer_impl.h:574
#8  TaskManager::TaskItem::task (this=0x2b5b940) at ../../../libs/taskmanager/taskitem.cpp:113
#9  0x00007fcfc5273112 in WindowTaskItem::publishIconGeometry (this=0x1a694b0) at ../../../../../plasma/desktop/applets/tasks/windowtaskitem.cpp:120
#10 0x00007fcfc5281b7c in AbstractTaskItem::timerEvent (this=0x1a694b0, event=<optimized out>) at ../../../../../plasma/desktop/applets/tasks/abstracttaskitem.cpp:439
#11 0x00007fcfdd34b789 in QObject::event (this=0x1a694b0, e=<optimized out>) at kernel/qobject.cpp:1181
#12 0x00007fcfdcd0389b in QGraphicsWidget::event (this=0x1a694b0, event=0x7ffff923cb50) at graphicsview/qgraphicswidget.cpp:1455
#13 0x00007fcfdc6e5424 in notify_helper (e=0x7ffff923cb50, receiver=0x1a694b0, this=0xcf9b10) at kernel/qapplication.cpp:4486
#14 QApplicationPrivate::notify_helper (this=0xcf9b10, receiver=0x1a694b0, e=0x7ffff923cb50) at kernel/qapplication.cpp:4458
#15 0x00007fcfdc6ea291 in QApplication::notify (this=0xceb010, receiver=0x1a694b0, e=0x7ffff923cb50) at kernel/qapplication.cpp:4365
#16 0x00007fcfddfe3126 in KApplication::notify (this=0xceb010, receiver=0x1a694b0, event=0x7ffff923cb50) at ../../kdeui/kernel/kapplication.cpp:311
#17 0x00007fcfdd334afc in QCoreApplication::notifyInternal (this=0xceb010, receiver=0x1a694b0, event=0x7ffff923cb50) at kernel/qcoreapplication.cpp:787
#18 0x00007fcfdd361d62 in sendEvent (event=0x7ffff923cb50, receiver=<optimized out>) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#19 QTimerInfoList::activateTimers (this=0xcfc950) at kernel/qeventdispatcher_unix.cpp:603
#20 0x00007fcfdd35f514 in timerSourceDispatch (source=<optimized out>) at kernel/qeventdispatcher_glib.cpp:184
#21 0x00007fcfd46f8a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#22 0x00007fcfd46f9258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#23 0x00007fcfd46f9429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#24 0x00007fcfdd35fed6 in QEventDispatcherGlib::processEvents (this=0xc43f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#25 0x00007fcfdc78d07e in QGuiEventDispatcherGlib::processEvents (this=<optimized out>, flags=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#26 0x00007fcfdd333cf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#27 0x00007fcfdd333ef7 in QEventLoop::exec (this=0x7ffff923cde0, flags=...) at kernel/qeventloop.cpp:201
#28 0x00007fcfdd338789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#29 0x00007fcfe04791a3 in kdemain (argc=1, argv=0x7ffff923d1c8) at ../../../../plasma/desktop/shell/main.cpp:120
#30 0x00007fcfe00ba30d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7ffff923d1c8, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7ffff923d1b8) at libc-start.c:226
#31 0x0000000000400671 in _start ()

Possible duplicates by query: bug 290881, bug 290870, bug 290859, bug 290813, bug 290810.

Reported using DrKonqi