Application: plasma-desktop (0.4)
KDE Platform Version: 4.5.80 (4.6 Beta1)
Qt Version: 4.7.1
Operating System: Linux 2.6.37-7-generic x86_64
Distribution: Ubuntu natty (development branch)

-- Information about the crash:
- What I was doing when the application crashed:

plasma-desktop crashed adding/removing new/old activities

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f8e58c0f7a0 (LWP 4049))]

Thread 5 (Thread 0x7f8e33934700 (LWP 4053)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007f8e33933a90 in ?? ()
#2  0x00007fff393567b2 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 4 (Thread 0x7f8e33133700 (LWP 4054)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007f8e33132aa0 in ?? ()
#2  0x00007fff393567b2 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 3 (Thread 0x7f8e2f9ea700 (LWP 4056)):
#0  0xffffffffff60017b in ?? ()
#1  0x00007f8e2f9e9a90 in ?? ()
#2  0x00007fff393567b2 in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 2 (Thread 0x7f8e2bfbf700 (LWP 4221)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f8e523a72d2 in QTWTF::TCMalloc_PageHeap::scavengerThread (this=0x7f8e526c0180) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:2359
#2  0x00007f8e523a7309 in QTWTF::TCMalloc_PageHeap::runScavengerThread (context=0x7f8e526ce254) at ../3rdparty/javascriptcore/JavaScriptCore/wtf/FastMalloc.cpp:1464
#3  0x00007f8e53ff0971 in start_thread (arg=<value optimized out>) at pthread_create.c:304
#4  0x00007f8e5832992d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f8e58c0f7a0 (LWP 4049)):
[KCrash Handler]
#6  0x00007f8e378b2159 in TaskManager::GroupManagerPrivate::currentActivityChanged (this=0x159cb40, newActivity=<value optimized out>) at ../../../libs/taskmanager/groupmanager.cpp:412
#7  0x00007f8e378b5c29 in TaskManager::GroupManager::qt_metacall (this=0x14f2640, _c=QMetaObject::InvokeMetaMethod, _id=5, _a=0x7fff391feb50) at ./groupmanager.moc:107
#8  0x00007f8e55538098 in QMetaObject::activate (sender=0x15984c0, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff391feb50) at kernel/qobject.cpp:3280
#9  0x00007f8e378c8035 in TaskManager::TaskManager::activityChanged (this=<value optimized out>, _t1=<value optimized out>) at ./taskmanager.moc:207
#10 0x00007f8e378c999d in TaskManager::TaskManager::qt_metacall (this=0x15984c0, _c=QMetaObject::InvokeMetaMethod, _id=12, _a=0x7fff391fed20) at ./taskmanager.moc:128
#11 0x00007f8e55538098 in QMetaObject::activate (sender=0x1563090, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff391fed20) at kernel/qobject.cpp:3280
#12 0x00007f8e57232d32 in KActivityConsumer::currentActivityChanged (this=<value optimized out>, _t1=<value optimized out>) at moc_kactivityconsumer.cpp:126
#13 0x00007f8e5723300d in KActivityConsumer::qt_metacall (this=0x1563090, _c=QMetaObject::InvokeMetaMethod, _id=0, _a=0x7fff391fee40) at moc_kactivityconsumer.cpp:87
#14 0x00007f8e55538098 in QMetaObject::activate (sender=0xf63f20, m=<value optimized out>, local_signal_index=<value optimized out>, argv=0x7fff391fee40) at kernel/qobject.cpp:3280
#15 0x00007f8e57252015 in OrgKdeActivityManagerInterface::CurrentActivityChanged (this=<value optimized out>, _t1=<value optimized out>) at activitymanager_interface.moc:249
#16 0x00007f8e57252413 in OrgKdeActivityManagerInterface::qt_metacall (this=0xf63f20, _c=QMetaObject::InvokeMetaMethod, _id=6, _a=0x7fff391ff6e0) at activitymanager_interface.moc:145
#17 0x00007f8e57232de0 in KActivityManager::qt_metacall (this=0xf63f20, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=0x7fff391ff6e0) at moc_kactivitymanager_p.cpp:75
#18 0x00007f8e5587705a in QDBusConnectionPrivate::deliverCall (this=0xc59b20, object=0xf63f20, msg=..., metaTypes=..., slotIdx=11) at qdbusintegrator.cpp:919
#19 0x00007f8e5588201f in QDBusCallDeliveryEvent::placeMetaCall (this=<value optimized out>, object=<value optimized out>) at qdbusintegrator_p.h:103
#20 0x00007f8e55536f2a in QObject::event (this=0xf63f20, e=<value optimized out>) at kernel/qobject.cpp:1219
#21 0x00007f8e548d1b04 in QApplicationPrivate::notify_helper (this=0xc86d40, receiver=0xf63f20, e=0x28eb4a0) at kernel/qapplication.cpp:4445
#22 0x00007f8e548d643a in QApplication::notify (this=<value optimized out>, receiver=0xf63f20, e=0x28eb4a0) at kernel/qapplication.cpp:4324
#23 0x00007f8e561d3906 in KApplication::notify (this=0xc58ef0, receiver=0xf63f20, event=0x28eb4a0) at ../../kdeui/kernel/kapplication.cpp:311
#24 0x00007f8e55522f7c in QCoreApplication::notifyInternal (this=0xc58ef0, receiver=0xf63f20, event=0x28eb4a0) at kernel/qcoreapplication.cpp:732
#25 0x00007f8e55526715 in sendEvent (receiver=0x0, event_type=0, data=0xc1d800) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:215
#26 QCoreApplicationPrivate::sendPostedEvents (receiver=0x0, event_type=0, data=0xc1d800) at kernel/qcoreapplication.cpp:1373
#27 0x00007f8e5554dd33 in sendPostedEvents (s=0xc89570) at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:220
#28 postEventSourceDispatch (s=0xc89570) at kernel/qeventdispatcher_glib.cpp:277
#29 0x00007f8e4c8b7add in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#30 0x00007f8e4c8b82c8 in ?? () from /lib/libglib-2.0.so.0
#31 0x00007f8e4c8b8559 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#32 0x00007f8e5554decf in QEventDispatcherGlib::processEvents (this=0xc1d2d0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:415
#33 0x00007f8e549779ae in QGuiEventDispatcherGlib::processEvents (this=<value optimized out>, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:204
#34 0x00007f8e55522362 in QEventLoop::processEvents (this=<value optimized out>, flags=...) at kernel/qeventloop.cpp:149
#35 0x00007f8e5552259c in QEventLoop::exec (this=0x7fff392000c0, flags=...) at kernel/qeventloop.cpp:201
#36 0x00007f8e555269bb in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1009
#37 0x00007f8e58603dd7 in kdemain (argc=1, argv=0x7fff39200488) at ../../../../plasma/desktop/shell/main.cpp:118
#38 0x00007f8e58261d8e in __libc_start_main (main=<value optimized out>, argc=<value optimized out>, ubp_av=<value optimized out>, init=<value optimized out>, fini=<value optimized out>, rtld_fini=<value optimized out>, stack_end=0x7fff39200478) at libc-start.c:226
#39 0x0000000000400669 in _start ()

Reported using DrKonqi