Version:            (using KDE Devel)
Installed from:    Compiled sources
Compiler:          gcc 3.3.1 
OS:          Linux

Easy reproduced in two different instalations with 17/09 CVS HEAD
If artsd is started, no crash anymore

Here's backtrace.

0x41325762 in __libc_waitpid (pid=3439, 
    stat_loc=0x0, options=0) at ../sysdeps/unix/sysv/linux/waitpid.c:28
28	    return INLINE_SYSCALL (wait4, 4, pid, stat_loc, options, NULL);
#0  0x41325762 in __libc_waitpid (pid=3439, stat_loc=0x0, options=0)
    at ../sysdeps/unix/sysv/linux/waitpid.c:28
#1  0x408cdb3c in KCrash::defaultCrashHandler(int) ()
   from /usr/lib/kde3/lib/libkdecore.so.4
#2  0x4132403d in __pthread_sighandler (signo=11, ctx=
      {gs = 0, __gsh = 0, fs = 0, __fsh = 0, es = 123, __esh = 0, ds = 123, __dsh = 0, edi = 8, esi = 135581308, ebp = 3221213624, esp = 3221213556, ebx = 1183571452, edx = 135611608, ecx = 1094850561, eax = 1180118484, trapno = 14, err = 4, eip = 1183364233, cs = 115, __csh = 0, eflags = 2163350, esp_at_signal = 3221213556, ss = 123, __ssh = 0, fpstate = 0xbfffcef8, oldmask = 2147483648, cr2 = 1180118484}) at sighandler.c:38
#3  0x414d7e18 in __libc_sigaction () from /lib/libc.so.6
#4  0x4686c065 in Arts::Dispatcher::Dispatcher(Arts::IOManager*, Arts::Dispatcher::StartServer) () from /usr/lib/kde3/lib/libmcop.so.1
#5  0x46a93c47 in arts_backend_init ()
   from /usr/lib/kde3/lib/libartscbackend.so.0
#6  0x4001b6a6 in arts_init () from /usr/lib/kde3/lib/libartsc.so.0
#7  0x40016f5d in open () from /usr/lib/kde3/lib/libartsdsp.so.0
#8  0x4621a985 in PlatformSoundMix::UnlockAudioCallback ()
   from /usr/lib/flash-plugin/libflashplayer.so
#9  0x4621aba5 in UnixSoundOSS::Open ()
   from /usr/lib/flash-plugin/libflashplayer.so
#10 0x4621a171 in PlatformSoundMix::OpenDevice ()
   from /usr/lib/flash-plugin/libflashplayer.so
#11 0x46219e8d in PlatformSoundMix::PlatformConstruct ()
   from /usr/lib/flash-plugin/libflashplayer.so
#12 0x4619a135 in CoreSoundMix::Construct ()
   from /usr/lib/flash-plugin/libflashplayer.so
#13 0x461e23de in CoreGlobals::Init ()
   from /usr/lib/flash-plugin/libflashplayer.so
#14 0x461b97c9 in CorePlayer::CorePlayer ()
   from /usr/lib/flash-plugin/libflashplayer.so
#15 0x461ef3e5 in UnixCommonPlayer::UnixCommonPlayer ()
   from /usr/lib/flash-plugin/libflashplayer.so
#16 0x46222954 in PlatformPlayer::PlatformPlayer ()
   from /usr/lib/flash-plugin/libflashplayer.so
#17 0x4622797e in NPP_New () from /usr/lib/flash-plugin/libflashplayer.so
#18 0x46226438 in Private_New () from /usr/lib/flash-plugin/libflashplayer.so
#19 0x0805725e in NSPluginClass::newInstance(QString, QString, bool, QStringList, QStringList, QString, QString) ()
#20 0x0805c038 in NSPluginClassIface::process(QCString const&, QMemArray<char> const&, QCString&, QMemArray<char>&) ()
#21 0x4098ca4b in DCOPClient::receive(QCString const&, QCString const&, QCString const&, QMemArray<char> const&, QCString&, QMemArray<char>&) ()
   from /usr/lib/kde3/lib/libDCOP.so.4
#22 0x40986600 in DCOPClient::processPostedMessagesInternal() ()
   from /usr/lib/kde3/lib/libDCOP.so.4
#23 0x40986010 in DCOPClient::handleAsyncReply(DCOPClient::ReplyStruct*) ()
   from /usr/lib/kde3/lib/libDCOP.so.4
#24 0x40995cfe in KDE_IceProcessMessages () from /usr/lib/kde3/lib/libDCOP.so.4
#25 0x4098dfee in DCOPClient::processSocketData(int) ()
   from /usr/lib/kde3/lib/libDCOP.so.4
#26 0x4098f423 in DCOPClient::qt_invoke(int, QUObject*) ()
   from /usr/lib/kde3/lib/libDCOP.so.4
#27 0x40c6ca68 in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#28 0x40c6cb9f in QObject::activate_signal(int, int) ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#29 0x40f45424 in QSocketNotifier::activated(int) ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#30 0x40c8580d in QSocketNotifier::event(QEvent*) ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#31 0x40c1807c in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#32 0x40c176ca in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#33 0x408448e1 in KApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/kde3/lib/libkdecore.so.4
#34 0x40c08ebe in QEventLoop::activateSocketNotifiers() ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#35 0x0805af49 in QXtEventLoop::processEvents(unsigned) ()
#36 0x40c2988a in QEventLoop::enterLoop() ()
   from /usr/lib/qt3/lib/libqt-mt.so.3
#37 0x40c2974c in QEventLoop::exec() () from /usr/lib/qt3/lib/libqt-mt.so.3
#38 0x40c18288 in QApplication::exec() () from /usr/lib/qt3/lib/libqt-mt.so.3
#39 0x0805a34d in main ()
#40 0x414c5a73 in __libc_start_main () from /lib/libc.so.6