Version:            (using KDE 4.3.4)
Installed from:    Gentoo Packages

Hello, krdc have crash, the backtrace:
Application: KRDC (krdc), signal: Segmentation fault
__lll_lock_wait_private ()
    at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
	in ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
[Current thread is 0 (LWP 2183)]

Thread 2 (Thread 0x7fa90601b910 (LWP 2213)):
[KCrash Handler]
#5  malloc_consolidate (av=0x7fa9101d2e60) at malloc.c:5066
#6  0x00007fa90fef3008 in _int_free (av=0x7fa9101d2e60, p=0xcd9c90) at malloc.c:4947
#7  0x00007fa90fef619c in *__GI___libc_free (mem=<value optimized out>) at malloc.c:3716
#8  0x00007fa90906aa35 in VncClientThread::run (this=0x93e0d0) at /var/tmp/portage/kde-base/krdc-4.3.4/work/krdc-4.3.4/krdc/vnc/vncclientthread.cpp:307
#9  0x00007fa910bf8ca4 in QThreadPrivate::start (arg=0x93e0d0) at thread/qthread_unix.cpp:188
#10 0x00007fa9109862b7 in start_thread (arg=<value optimized out>) at pthread_create.c:297
#11 0x00007fa90ff4e7dd in clone () at ../sysdeps/unix/sysv/linux/x86_64/clone.S:112
#12 0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7fa9141b2740 (LWP 2183)):
#0  __lll_lock_wait_private () at ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S:97
#1  0x00007fa90fef7d25 in _L_lock_9482 () from /lib/libc.so.6
#2  0x00007fa90fef6191 in *__GI___libc_free (mem=0x7fa9101d2e60) at malloc.c:3714
#3  0x00007fa910ce62fc in QObjectPrivate::derefSender (this=0x763070, sender=0x93e070, signal=27) at ../../include/QtCore/../../src/corelib/tools/qlist.h:348
#4  0x00007fa910cec90c in ~QObject (this=0x93e070) at kernel/qobject.cpp:781
#5  0x00007fa9118a50a7 in ~QWidget (this=0x93e070) at kernel/qwidget.cpp:1380
#6  0x00007fa90906f55a in ~VncView (this=0x93e070) at /var/tmp/portage/kde-base/krdc-4.3.4/work/krdc-4.3.4/krdc/vnc/vncview.cpp:97
#7  0x00007fa910ce6108 in QObjectPrivate::deleteChildren (this=0xcc8720) at kernel/qobject.cpp:1838
#8  0x00007fa9118a455c in ~QWidget (this=0xcc72a0) at kernel/qwidget.cpp:1367
#9  0x00007fa910ce6108 in QObjectPrivate::deleteChildren (this=0xcc8eb0) at kernel/qobject.cpp:1838
#10 0x00007fa9118a4f1c in ~QWidget (this=0xc5fc40) at kernel/qwidget.cpp:1367
#11 0x000000000042a298 in ~RemoteViewScrollArea (this=0x7fa9101d2e60) at /var/tmp/portage/kde-base/krdc-4.3.4/work/krdc-4.3.4/krdc/mainwindow.h:158
#12 0x00007fa910ce7bed in QObject::event (this=0xc5fc40, e=0x80) at kernel/qobject.cpp:1085
#13 0x00007fa9118ac63b in QWidget::event (this=0xc5fc40, event=0x8ddf20) at kernel/qwidget.cpp:7951
#14 0x00007fa911bf0f9c in QFrame::event (this=0xc5fc40, e=0x8ddf20) at widgets/qframe.cpp:559
#15 0x00007fa911c7dee1 in QAbstractScrollArea::event (this=0xc5fc40, e=0x8ddf20) at widgets/qabstractscrollarea.cpp:918
#16 0x00007fa9118588d5 in QApplicationPrivate::notify_helper (this=0x6ebe80, receiver=0xc5fc40, e=0x8ddf20) at kernel/qapplication.cpp:4065
#17 0x00007fa91186045a in QApplication::notify (this=0x7fff6fd604a0, receiver=0xc5fc40, e=0x8ddf20) at kernel/qapplication.cpp:4030
#18 0x00007fa91266f5ea in KApplication::notify (this=0x7fff6fd604a0, receiver=0xc5fc40, event=0x8ddf20) at /var/tmp/portage/kde-base/kdelibs-4.3.4/work/kdelibs-4.3.4/kdeui/kernel/kapplication.cpp:302
#19 0x00007fa910cd7d2b in QCoreApplication::notifyInternal (this=0x7fff6fd604a0, receiver=0xc5fc40, event=0x8ddf20) at kernel/qcoreapplication.cpp:606
#20 0x00007fa910cd86f8 in QCoreApplicationPrivate::sendPostedEvents (receiver=<value optimized out>, event_type=0, data=0x6d9180) at kernel/qcoreapplication.h:213
#21 0x00007fa910cffa53 in postEventSourceDispatch (s=<value optimized out>) at kernel/qcoreapplication.h:218
#22 0x00007fa90d5f7649 in IA__g_main_context_dispatch (context=0x6ee840) at gmain.c:1824
#23 0x00007fa90d5fae68 in g_main_context_iterate (context=0x6ee840, block=1, dispatch=1, self=<value optimized out>) at gmain.c:2455
#24 0x00007fa90d5fb01e in IA__g_main_context_iteration (context=0x6ee840, may_block=1) at gmain.c:2518
#25 0x00007fa910cff64f in QEventDispatcherGlib::processEvents (this=0x6ec0b0, flags=<value optimized out>) at kernel/qeventdispatcher_glib.cpp:327
#26 0x00007fa9118e7b28 in QGuiEventDispatcherGlib::processEvents (this=0x7fa9101d2e60, flags=<value optimized out>) at kernel/qguieventdispatcher_glib.cpp:202
#27 0x00007fa910cd6372 in QEventLoop::processEvents (this=<value optimized out>, flags={i = 1876296640}) at kernel/qeventloop.cpp:149
#28 0x00007fa910cd655c in QEventLoop::exec (this=0x7fff6fd60400, flags={i = 1876296720}) at kernel/qeventloop.cpp:197
#29 0x00007fa910cd899c in QCoreApplication::exec () at kernel/qcoreapplication.cpp:888
#30 0x000000000042b3ab in main (argc=3, argv=0x7fff6fd609d8) at /var/tmp/portage/kde-base/krdc-4.3.4/work/krdc-4.3.4/krdc/main.cpp:101
97	in ../nptl/sysdeps/unix/sysv/linux/x86_64/lowlevellock.S
Thanks to fix it.