Version:           3.0.0a6 (using KDE KDE 3.1.4)
Installed from:    Slackware Packages
Compiler:          gcc 3.2.2 
OS:          Linux

As above, here is the process and backtrace:


1. Open recent project
2. Open several files
3. Close these files successively by clicking on the 'x' in the top right corner.

(no debugging symbols found)...(no debugging symbols found)...
(no debugging symbols found)...(no debugging symbols found)...[New Thread 16384 (LWP 4252)]
[New Thread 32769 (LWP 4256)]
[New Thread 16386 (LWP 4257)]

0x414e860c in waitpid () from /lib/libpthread.so.0
#0  0x414e860c in waitpid () from /lib/libpthread.so.0
#1  0x40bd89ed in KCrash::defaultCrashHandler(int) ()
   from /opt/kde/lib/libkdecore.so.4
#2  0x414e6c45 in __pthread_sighandler () from /lib/libpthread.so.0
#3  <signal handler called>
#4  0xffffffff in ?? ()
#5  0x41062d5c in QMenuBar::setupAccelerators() ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#6  0x4105fb48 in QMenuBar::performDelayedContentsChanged() ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#7  0x4105fc39 in QMenuBar::performDelayedChanges() ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#8  0x4129a1b6 in QMenuBar::qt_invoke(int, QUObject*) ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#9  0x409db0ed in KMenuBar::qt_invoke(int, QUObject*) ()
   from /opt/kde/lib/libkdeui.so.4
#10 0x40f6d490 in QObject::activate_signal(QConnectionList*, QUObject*) ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#11 0x41285d62 in QSignal::signal(QVariant const&) ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#12 0x40f87438 in QSignal::activate() () from /usr/lib/qt/lib/libqt-mt.so.3
#13 0x40f8e9e3 in QSingleShotTimer::event(QEvent*) ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#14 0x40f12495 in QApplication::internalNotify(QObject*, QEvent*) ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#15 0x40f11b4b in QApplication::notify(QObject*, QEvent*) ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#16 0x40b5bc89 in KApplication::notify(QObject*, QEvent*) ()
   from /opt/kde/lib/libkdecore.so.4
#17 0x40f01ecb in QEventLoop::activateTimers() ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#18 0x40ebfc24 in QEventLoop::processEvents(unsigned) ()
   from /usr/lib/qt/lib/libqt-mt.so.3
#19 0x40f256d6 in QEventLoop::enterLoop() () from /usr/lib/qt/lib/libqt-mt.so.3
#20 0x40f25578 in QEventLoop::exec() () from /usr/lib/qt/lib/libqt-mt.so.3
#21 0x40f126e1 in QApplication::exec() () from /usr/lib/qt/lib/libqt-mt.so.3
#22 0x0806776a in QGListIterator::~QGListIterator() ()
#23 0x41638d06 in __libc_start_main () from /lib/libc.so.6