Application: plasma-overlay (0.0)
KDE Platform Version: 4.11.00 (Compiled from sources)
Qt Version: 4.8.4
Operating System: Linux 3.8.0-29-generic x86_64
Distribution: Ubuntu 13.04

-- Information about the crash:
I tried it a few times with the same exact steps; for some reason, it seems to fail to cleanly exit after unlocking the screen. It might be an issue with one of the Plasmaoids I'm using that communicates with MPRIS.

The crash can be reproduced every time.

-- Backtrace:
Application: Plasma for the Screensaver (plasma-overlay), signal: Segmentation fault
Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
[Current thread is 1 (Thread 0x7fd5dc4ed7c0 (LWP 9305))]

Thread 4 (Thread 0x7fd5c0de8700 (LWP 9306)):
#0  pthread_cond_wait@@GLIBC_2.3.2 () at ../nptl/sysdeps/unix/sysv/linux/x86_64/pthread_cond_wait.S:185
#1  0x00007fd5d5ff4b27 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#2  0x00007fd5d5ff4b59 in ?? () from /usr/lib/x86_64-linux-gnu/libQtScript.so.4
#3  0x00007fd5d0f9af8e in start_thread (arg=0x7fd5c0de8700) at pthread_create.c:311
#4  0x00007fd5d8733e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 3 (Thread 0x7fd52f767700 (LWP 9309)):
#0  0x00007fd5d06c9359 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#1  0x00007fd5d06c95e9 in g_mutex_unlock () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd5d068a30e in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd5d8eac036 in QEventDispatcherGlib::processEvents (this=0x7fd5280008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fd5d8e7c38f in QEventLoop::processEvents (this=this@entry=0x7fd52f766d90, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fd5d8e7c618 in QEventLoop::exec (this=this@entry=0x7fd52f766d90, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fd5d8d7e410 in QThread::exec (this=this@entry=0x263c380) at thread/qthread.cpp:542
#7  0x00007fd5d8e5dedf in QInotifyFileSystemWatcherEngine::run (this=0x263c380) at io/qfilesystemwatcher_inotify.cpp:256
#8  0x00007fd5d8d80bec in QThreadPrivate::start (arg=0x263c380) at thread/qthread_unix.cpp:338
#9  0x00007fd5d0f9af8e in start_thread (arg=0x7fd52f767700) at pthread_create.c:311
#10 0x00007fd5d8733e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 2 (Thread 0x7fd52d948700 (LWP 9320)):
#0  0x00007fd5d87273cd in poll () at ../sysdeps/unix/syscall-template.S:81
#1  0x00007fd5d068a1dc in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#2  0x00007fd5d068a304 in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
#3  0x00007fd5d8eac036 in QEventDispatcherGlib::processEvents (this=0x7fd5140008c0, flags=...) at kernel/qeventdispatcher_glib.cpp:426
#4  0x00007fd5d8e7c38f in QEventLoop::processEvents (this=this@entry=0x7fd52d947d90, flags=...) at kernel/qeventloop.cpp:149
#5  0x00007fd5d8e7c618 in QEventLoop::exec (this=this@entry=0x7fd52d947d90, flags=...) at kernel/qeventloop.cpp:204
#6  0x00007fd5d8d7e410 in QThread::exec (this=this@entry=0x2f75170) at thread/qthread.cpp:542
#7  0x00007fd5d8e5dedf in QInotifyFileSystemWatcherEngine::run (this=0x2f75170) at io/qfilesystemwatcher_inotify.cpp:256
#8  0x00007fd5d8d80bec in QThreadPrivate::start (arg=0x2f75170) at thread/qthread_unix.cpp:338
#9  0x00007fd5d0f9af8e in start_thread (arg=0x7fd52d948700) at pthread_create.c:311
#10 0x00007fd5d8733e1d in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:113

Thread 1 (Thread 0x7fd5dc4ed7c0 (LWP 9305)):
[KCrash Handler]
#6  0x00007fd5d921e74b in QDBusAdaptorConnector::relaySlot (this=this@entry=0x7fd51c05e790, argv=argv@entry=0x7fff88cac4d0) at qdbusabstractadaptor.cpp:270
#7  0x00007fd5d921ed55 in QDBusAdaptorConnector::qt_metacall (this=0x7fd51c05e790, _c=QMetaObject::InvokeMetaMethod, _id=<optimized out>, _a=0x7fff88cac4d0) at qdbusabstractadaptor.cpp:366
#8  0x00007fd5d8e922b3 in QMetaObject::activate (sender=sender@entry=0x7fd51c04efd0, m=m@entry=0x7fd5d91d5b40 <QObject::staticMetaObject>, local_signal_index=local_signal_index@entry=0, argv=argv@entry=0x7fff88cac4d0) at kernel/qobject.cpp:3558
#9  0x00007fd5d8e92b2f in QObject::destroyed (this=this@entry=0x7fd51c04efd0, _t1=_t1@entry=0x7fd51c04efd0) at .moc/release-shared/moc_qobject.cpp:149
#10 0x00007fd5d8e96a33 in QObject::~QObject (this=0x7fd51c04efd0, __in_chrg=<optimized out>) at kernel/qobject.cpp:843
#11 0x00007fd5d4f3f619 in KIO::Scheduler::~Scheduler (this=0x7fd51c04efd0, __in_chrg=<optimized out>) at ../../kio/kio/scheduler.cpp:791
#12 0x00007fd5d4f4b16b in KIO::SchedulerPrivate::~SchedulerPrivate (this=0x7fd51c025180, __in_chrg=<optimized out>) at ../../kio/kio/scheduler.cpp:667
#13 0x00007fd5d4f45da7 in destroy () at ../../kio/kio/scheduler.cpp:748
#14 0x00007fd5d8676121 in __run_exit_handlers (status=0, listp=0x7fd5d89fb6a8 <__exit_funcs>, run_list_atexit=run_list_atexit@entry=true) at exit.c:77
#15 0x00007fd5d86761a5 in __GI_exit (status=<optimized out>) at exit.c:99
#16 0x00007fd5d865beac in __libc_start_main (main=0x413a30 <main(int, char**)>, argc=1, ubp_av=0x7fff88cac718, init=<optimized out>, fini=<optimized out>, rtld_fini=<optimized out>, stack_end=0x7fff88cac708) at libc-start.c:294
#17 0x0000000000413fd1 in _start ()

Possible duplicates by query: bug 316003, bug 315838.

Reported using DrKonqi