Version:            (using KDE 4.2.4)
OS:                Linux
Installed from:    Ubuntu Packages

When loading a link in FireFox with a flash applet in it, Plasma crashed and all applications loaded in the system tray disappeared.

The following is the output from the crash handler:

Application: Plasma Workspace (plasma), signal SIGSEGV
[Current thread is 0 (LWP 17767)]

Thread 3 (Thread 0xa93e7b90 (LWP 17775)):
#0  0xb7fe5430 in __kernel_vsyscall ()
#1  0xb517a0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63322ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb651e9b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xb799f152 in ?? () from /usr/lib/libQtNetwork.so.4
#5  0xb651d96e in ?? () from /usr/lib/libQtCore.so.4
#6  0xb51764ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb632349e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 2 (Thread 0xa8bb0b90 (LWP 17776)):
#0  0xb7fe5430 in __kernel_vsyscall ()
#1  0xb517a0e5 in pthread_cond_wait@@GLIBC_2.3.2 () from /lib/tls/i686/cmov/libpthread.so.0
#2  0xb63322ed in pthread_cond_wait () from /lib/tls/i686/cmov/libc.so.6
#3  0xb651e9b2 in QWaitCondition::wait () from /usr/lib/libQtCore.so.4
#4  0xa9774b9a in ?? () from /usr/lib/kde4/plasma_wallpaper_image.so
#5  0xb651d96e in ?? () from /usr/lib/libQtCore.so.4
#6  0xb51764ff in start_thread () from /lib/tls/i686/cmov/libpthread.so.0
#7  0xb632349e in clone () from /lib/tls/i686/cmov/libc.so.6

Thread 1 (Thread 0xb4c67710 (LWP 17767)):
[KCrash Handler]
#6  0xb6628951 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#7  0xa96010d3 in TaskManager::AbstractGroupingStrategy::groupRemoved () from /usr/lib/libtaskmanager.so.4
#8  0xa96027d1 in TaskManager::AbstractGroupingStrategy::closeGroup () from /usr/lib/libtaskmanager.so.4
#9  0xa9609597 in ?? () from /usr/lib/libtaskmanager.so.4
#10 0xa960a23b in ?? () from /usr/lib/libtaskmanager.so.4
#11 0xb6627ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#12 0xb6628932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#13 0xa961ba63 in TaskManager::TaskGroup::itemRemoved () from /usr/lib/libtaskmanager.so.4
#14 0xa961c0b0 in TaskManager::TaskGroup::remove () from /usr/lib/libtaskmanager.so.4
#15 0xa9604f10 in TaskManager::GroupManager::remove () from /usr/lib/libtaskmanager.so.4
#16 0xa9606c47 in TaskManager::GroupManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#17 0xb6627ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#18 0xb6628932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#19 0xa961f483 in TaskManager::TaskManager::taskRemoved () from /usr/lib/libtaskmanager.so.4
#20 0xa9620baf in TaskManager::TaskManager::windowRemoved () from /usr/lib/libtaskmanager.so.4
#21 0xa9622a14 in TaskManager::TaskManager::qt_metacall () from /usr/lib/libtaskmanager.so.4
#22 0xb6627ca8 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#23 0xb6628932 in QMetaObject::activate () from /usr/lib/libQtCore.so.4
#24 0xb7860473 in KWindowSystem::windowRemoved () from /usr/lib/libkdeui.so.5
#25 0xb7862cf6 in ?? () from /usr/lib/libkdeui.so.5
#26 0xb78721d3 in NETRootInfo::update () from /usr/lib/libkdeui.so.5
#27 0xb78725bf in NETRootInfo::event () from /usr/lib/libkdeui.so.5
#28 0xb7862f8d in ?? () from /usr/lib/libkdeui.so.5
#29 0xb7715c69 in KApplication::x11EventFilter () from /usr/lib/libkdeui.so.5
#30 0xb7f9f4d7 in ?? () from /usr/lib/libkdeinit4_plasma.so
#31 0xb6921f3e in ?? () from /usr/lib/libQtGui.so.4
#32 0xb69346a8 in QApplication::x11ProcessEvent () from /usr/lib/libQtGui.so.4
#33 0xb6960c6a in ?? () from /usr/lib/libQtGui.so.4
#34 0xb4f74b88 in g_main_context_dispatch () from /usr/lib/libglib-2.0.so.0
#35 0xb4f780eb in ?? () from /usr/lib/libglib-2.0.so.0
#36 0xb4f78268 in g_main_context_iteration () from /usr/lib/libglib-2.0.so.0
#37 0xb663d438 in QEventDispatcherGlib::processEvents () from /usr/lib/libQtCore.so.4
#38 0xb6960365 in ?? () from /usr/lib/libQtGui.so.4
#39 0xb661006a in QEventLoop::processEvents () from /usr/lib/libQtCore.so.4
#40 0xb66104aa in QEventLoop::exec () from /usr/lib/libQtCore.so.4
#41 0xb6612959 in QCoreApplication::exec () from /usr/lib/libQtCore.so.4
#42 0xb68bed17 in QApplication::exec () from /usr/lib/libQtGui.so.4
#43 0xb7f8cb56 in kdemain () from /usr/lib/libkdeinit4_plasma.so
#44 0x08048712 in _start ()