Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.2 (KDE 4.3.2)
Qt Version: 4.5.2
Operating System: Linux 2.6.31-14-generic i686
Distribution: Ubuntu 9.10

What I was doing when the application crashed:
I updated a plasmoid (smooth-tasks) from source, then removed an instance of the plasmoid from my panel in order to replace it with the new version, resulting in plasma-desktop crashing.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Aborted
[Current thread is 1 (Thread 0xb7802700 (LWP 1802))]

Thread 3 (Thread 0xab7a4b70 (LWP 1805)):
#0  0x00357422 in __kernel_vsyscall ()
#1  0x00377e15 in pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/pthread_cond_wait.S:122
#2  0x009f978d in __pthread_cond_wait (cond=0x9360368, mutex=0x9360350) at forward.c:139
#3  0x0015fe67 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib/libQtCore.so.4
#4  0x02061922 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0x0015ee32 in ?? () from /usr/lib/libQtCore.so.4
#6  0x0037380e in start_thread (arg=0xab7a4b70) at pthread_create.c:300
#7  0x009ec7ee in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 2 (Thread 0xa98e2b70 (LWP 1806)):
#0  0x00357422 in __kernel_vsyscall ()
#1  0x009f9ae3 in __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/i386/i686/../i486/lowlevellock.S:95
#2  0x00990f07 in _L_lock_9496 () from /lib/tls/i686/cmov/libc.so.6
#3  0x0098f796 in *__GI___libc_free (mem=0x95c8f30) at malloc.c:3714
#4  0x03937186 in g_free () from /lib/libglib-2.0.so.0
#5  0x0027ac28 in QEventDispatcherGlib::~QEventDispatcherGlib() () from /usr/lib/libQtCore.so.4
#6  0x0015efb8 in ?? () from /usr/lib/libQtCore.so.4
#7  0x0015ee3a in ?? () from /usr/lib/libQtCore.so.4
#8  0x0037380e in start_thread (arg=0xa98e2b70) at pthread_create.c:300
#9  0x009ec7ee in clone () at ../sysdeps/unix/sysv/linux/i386/clone.S:130

Thread 1 (Thread 0xb7802700 (LWP 1802)):
[KCrash Handler]
#6  0x00357422 in __kernel_vsyscall ()
#7  0x0094a4d1 in *__GI_raise (sig=6) at ../nptl/sysdeps/unix/sysv/linux/raise.c:64
#8  0x0094d932 in *__GI_abort () at abort.c:92
#9  0x00980ee5 in __libc_message (do_abort=2, fmt=0xa44438 "*** glibc detected *** %s: %s: 0x%s ***\n") at ../sysdeps/unix/sysv/linux/libc_fatal.c:189
#10 0x0098aff1 in malloc_printerr (action=<value optimized out>, str=0x6 <Address 0x6 out of bounds>, ptr=0x93cb570) at malloc.c:6217
#11 0x0098c6f2 in _int_free (av=<value optimized out>, p=<value optimized out>) at malloc.c:4750
#12 0x0098f79d in *__GI___libc_free (mem=0x93cb570) at malloc.c:3716
#13 0x008e66f1 in operator delete(void*) () from /usr/lib/libstdc++.so.6
#14 0x050f7231 in ?? () from /usr/lib/libtaskmanager.so.4
#15 0x050ee303 in TaskManager::GroupManager::~GroupManager() () from /usr/lib/libtaskmanager.so.4
#16 0x04c049ef in QString (this=0x9006ba0) at /usr/include/qt4/QtCore/qstring.h:413
#17 SmoothTasks::Applet::init (this=0x9006ba0) at /home/steven/Programs/smooth-tasks-src-wip-2009-11-11/applet/SmoothTasks/Applet.cpp:150
#18 0x0025e135 in qDeleteInEventHandler(QObject*) () from /usr/lib/libQtCore.so.4
#19 0x0025f62b in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4
#20 0x01831b64 in QGraphicsWidget::event(QEvent*) () from /usr/lib/libQtGui.so.4
#21 0x011d8f54 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#22 0x011e067c in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4
#23 0x00ef8bfa in KApplication::notify(QObject*, QEvent*) () from /usr/lib/libkdeui.so.5
#24 0x0024f6cb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4
#25 0x002502b2 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4
#26 0x0025047d in QCoreApplication::sendPostedEvents(QObject*, int) () from /usr/lib/libQtCore.so.4
#27 0x0027a3ff in ?? () from /usr/lib/libQtCore.so.4
#28 0x0392ee78 in g_main_context_dispatch () from /lib/libglib-2.0.so.0
#29 0x03932720 in ?? () from /lib/libglib-2.0.so.0
#30 0x03932853 in g_main_context_iteration () from /lib/libglib-2.0.so.0
#31 0x0027a02c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#32 0x01279be5 in ?? () from /usr/lib/libQtGui.so.4
#33 0x0024dc79 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#34 0x0024e0ca in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4
#35 0x0025053f in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4
#36 0x011d8dd7 in QApplication::exec() () from /usr/lib/libQtGui.so.4
#37 0x0833780d in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#38 0x0804dde1 in _start ()

Reported using DrKonqi