Application: plasma-desktop (0.4)
KDE Platform Version: 4.7.4 (4.7.4)
Qt Version: 4.7.4
Operating System: Linux 3.0.0-15-generic x86_64
Distribution: Linux Mint 12 KDE

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

I accidentally removed the "Messsage Indicator" Appl second time, but didn't et and was trying to add it back, when KDS crashed. It did not crash the second time I tried, but did not add it either. 

THis is on Mint 12 KDE.

The crash can be reproduced some of the time.

-- Backtrace:
Application: Plasma Desktop Shell (plasma-desktop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f78c916e7a0 (LWP 1868))]

Thread 5 (Thread 0x7f78b0508700 (LWP 1869)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:162
#1  0x00007f78c2c3efe2 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007f78c2c3f019 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007f78bd89fefc in start_thread (arg=0x7f78b0508700) at pthread_create.c:304
#4  0x00007f78c8a5989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#5  0x0000000000000000 in ?? ()

Thread 4 (Thread 0x7f78ac8de700 (LWP 1870)):
#0  0x00007f78bd8a31fd in __pthread_mutex_unlock_usercnt (mutex=<optimized out>, decr=<optimized out>) at pthread_mutex_unlock.c:52
#1  __pthread_mutex_unlock (mutex=0x7f78a80009a8) at pthread_mutex_unlock.c:290
#2  0x00007f78bcd923f5 in g_main_context_query () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f78bcd92e6a in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#4  0x00007f78bcd93429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f78c5c39f3e in QEventDispatcherGlib::processEvents (this=0x7f78a80008b0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#6  0x00007f78c5c0dcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#7  0x00007f78c5c0def7 in QEventLoop::exec (this=0x7f78ac8dddb0, flags=...) at kernel/qeventloop.cpp:201
#8  0x00007f78c5b2527f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#9  0x00007f78c5bf0cbf in QInotifyFileSystemWatcherEngine::run (this=0x16b2f10) at io/qfilesystemwatcher_inotify.cpp:248
#10 0x00007f78c5b27d05 in QThreadPrivate::start (arg=0x16b2f10) at thread/qthread_unix.cpp:331
#11 0x00007f78bd89fefc in start_thread (arg=0x7f78ac8de700) at pthread_create.c:304
#12 0x00007f78c8a5989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#13 0x0000000000000000 in ?? ()

Thread 3 (Thread 0x7f78a2b0b700 (LWP 1871)):
#0  0x00007f78bd8a2034 in __pthread_mutex_lock (mutex=0x1bede48) at pthread_mutex_lock.c:61
#1  0x00007f78bcd92f2f in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f78bcd93429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f78c5c39f3e in QEventDispatcherGlib::processEvents (this=0x1be4ab0, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:424
#4  0x00007f78c5c0dcf2 in QEventLoop::processEvents (this=<optimized out>, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007f78c5c0def7 in QEventLoop::exec (this=0x7f78a2b0adb0, flags=...) at kernel/qeventloop.cpp:201
#6  0x00007f78c5b2527f in QThread::exec (this=<optimized out>) at thread/qthread.cpp:498
#7  0x00007f78c5bf0cbf in QInotifyFileSystemWatcherEngine::run (this=0x1be4280) at io/qfilesystemwatcher_inotify.cpp:248
#8  0x00007f78c5b27d05 in QThreadPrivate::start (arg=0x1be4280) at thread/qthread_unix.cpp:331
#9  0x00007f78bd89fefc in start_thread (arg=0x7f78a2b0b700) at pthread_create.c:304
#10 0x00007f78c8a5989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f7899cfd700 (LWP 1878)):
#0  0x00007f78c8a4d773 in __GI___poll (fds=<optimized out>, nfds=<optimized out>, timeout=<optimized out>) at ../sysdeps/unix/sysv/linux/poll.c:87
#1  0x00007f78bcd92f68 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007f78bcd93792 in g_main_loop_run () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007f789a7db516 in ?? () from /usr/lib/x86_64-linux-gnu/libgio-2.0.so.0
#4  0x00007f78bcdb82b6 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#5  0x00007f78bd89fefc in start_thread (arg=0x7f7899cfd700) at pthread_create.c:304
#6  0x00007f78c8a5989d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f78c916e7a0 (LWP 1868)):
[KCrash Handler]
#6  QCoreApplication::postEvent (receiver=0x3fe8b30, event=0x32deae0, priority=0) at kernel/qcoreapplication.cpp:1188
#7  0x00007f78c504e29a in takeAt (i=50985872, this=0x0) at ../../include/QtCore/../../src/corelib/tools/qlist.h:474
#8  QX11Data::xdndHandleFinished (this=<optimized out>, xe=0x7fffef0796e0, passive=false) at kernel/qdnd_x11.cpp:1233
#9  0x00007f78c50403c3 in QApplication::x11ClientMessage (this=0x3fe8b30, w=0x3312e60, event=0x0, passive_only=false) at kernel/qapplication_x11.cpp:3213
#10 0x00007f78c503e8fb in QApplication::x11ProcessEvent (this=0x165ed10, event=0x7fffef0796e0) at kernel/qapplication_x11.cpp:3685
#11 0x00007f78c5067412 in x11EventSourceDispatch (s=0x166f270, callback=0, user_data=0x0) at kernel/qguieventdispatcher_glib.cpp:143
#12 0x00007f78bcd92a5d in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#13 0x00007f78bcd93258 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#14 0x00007f78bcd93429 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#15 0x00007f78c5c39ed6 in QEventDispatcherGlib::processEvents (this=0x1601f40, flags=<optimized out>) at kernel/qeventdispatcher_glib.cpp:422
#16 0x00007f78c506707e in QGuiEventDispatcherGlib::~QGuiEventDispatcherGlib (this=0x0, __in_chrg=<optimized out>) at kernel/qguieventdispatcher_glib.cpp:195
#17 0x00000000017923d0 in ?? ()
#18 0x00007fffef079a70 in ?? ()
#19 0x00007f78c5c0dcf2 in QEventLoop::processEvents (this=<optimized out>, flags=) at kernel/qeventloop.cpp:149
#20 0x00007f78c5c0def7 in QEventLoop::exec (this=0x7fffef079ab0, flags=...) at kernel/qeventloop.cpp:201
#21 0x00007f78c5c12789 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1064
#22 0x00007f78c8d581a3 in kdemain (argc=1, argv=0x7fffef079e98) at ../../../../plasma/desktop/shell/main.cpp:120
#23 0x00007f78c899930d in __libc_start_main (main=0x400640 <main(int, char**)>, argc=1, ubp_av=0x7fffef079e98, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fffef079e88) at libc-start.c:226
#24 0x0000000000400671 in _start ()

Reported using DrKonqi