Application that crashed: plasma-desktop
Version of the application: 0.3
KDE Version: 4.3.00 (KDE 4.3.0)
Qt Version: 4.5.2
Operating System: Linux 2.6.28-15-generic x86_64
Distribution: Ubuntu 9.04

What I was doing when the application crashed:
Adding plasmoids as folder view, eyes, and finally gmail-plasmoid, causes the crash by segmentation fault. The bug doesn't occur each time I add the same plasmoïds, and occurs sometimes I add other plasmoïds.

 -- Backtrace:
Application: Plasma Workspace (kdeinit4), signal: Segmentation fault
[Current thread is 0 (LWP 4811)]

Thread 2 (Thread 0x7f4d537ea950 (LWP 4814)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:261
#1  0x00007f4d73b3ed19 in QWaitCondition::wait (this=0x20747a0, mutex=0x2074798, time=18446744073709551615) at thread/qwaitcondition_unix.cpp:87
#2  0x00007f4d729c881c in QHostInfoAgent::run (this=0x2074780) at kernel/qhostinfo.cpp:260
#3  0x00007f4d73b3dd35 in QThreadPrivate::start (arg=0x2074780) at thread/qthread_unix.cpp:188
#4  0x00007f4d6fa373ba in start_thread (arg=<value optimized out>) at pthread_create.c:297
#5  0x00007f4d7061bfcd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#6  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f4d74102750 (LWP 4811)):
[KCrash Handler]
#5  QCoreApplication::postEvent (receiver=0x2b90180, event=0x3f9b930, priority=0) at kernel/qcoreapplication.cpp:1012
#6  0x00007f4d71276523 in QX11Data::xdndHandleFinished (this=<value optimized out>, xe=0x7fff7c1389b0, passive=false) at kernel/qdnd_x11.cpp:1244
#7  0x00007f4d7124fe26 in QApplication::x11ClientMessage (this=<value optimized out>, w=0x36d5820, event=0x7fff7c1389b0, passive_only=false) at kernel/qapplication_x11.cpp:3126
#8  0x00007f4d712631f7 in QApplication::x11ProcessEvent (this=0x1923580, event=0x7fff7c1389b0) at kernel/qapplication_x11.cpp:3682
#9  0x00007f4d7128c454 in x11EventSourceDispatch (s=0x192fd20, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:146
#10 0x00007f4d6fc8620a in IA__g_main_context_dispatch (context=0x192ed30) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:1814
#11 0x00007f4d6fc898e0 in g_main_context_iterate (context=0x192ed30, block=1, dispatch=1, self=<value optimized out>) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2448
#12 0x00007f4d6fc89a7c in IA__g_main_context_iteration (context=0x192ed30, may_block=1) at /build/buildd/glib2.0-2.20.1/glib/gmain.c:2511
#13 0x00007f4d73c50a8f in QEventDispatcherGlib::processEvents (this=0x192c1e0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#14 0x00007f4d7128bbdf in QGuiEventDispatcherGlib::processEvents (this=0x2b90180, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#15 0x00007f4d73c25f42 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 2081655968}) at kernel/qeventloop.cpp:149
#16 0x00007f4d73c26314 in QEventLoop::exec (this=0x7fff7c138ce0, flags={i = 2081656048}) at kernel/qeventloop.cpp:201
#17 0x00007f4d73c285e4 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#18 0x00007f4d67b6b1eb in kdemain () from /usr/lib/libkdeinit4_plasma-desktop.so
#19 0x0000000000407215 in launch (argc=1, _name=0x18df0e8 "/usr/bin/plasma-desktop", args=<value optimized out>, cwd=0x0, envc=0, envs=0x18df108 "", reset_env=false, tty=0x0, avoid_loops=false, 
    startup_id_str=0x40a3a1 "0") at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:676
#20 0x0000000000407a38 in handle_launcher_request (sock=7, who=<value optimized out>) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1168
#21 0x0000000000407fe5 in handle_requests (waitForPid=0) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1361
#22 0x0000000000408b26 in main (argc=2, argv=0x7fff7c139b88, envp=0x7fff7c139ba0) at /build/buildd/kde4libs-4.3.0/kinit/kinit.cpp:1788

Reported using DrKonqi