Version:           3.3.92 (using KDE KDE 3.5.2)
Installed from:    Ubuntu Packages
OS:                Linux

Create a new PHP Simple Project, try CTRL+SPACE in the generated PHP file -> CRASH:

Using host libthread_db library "/lib/tls/i686/cmov/libthread_db.so.1".
[Thread debugging using libthread_db enabled]
[New Thread -1242007872 (LWP 16048)]
[New Thread -1252512848 (LWP 16088)]
[KCrash handler]
#6  0xb4b9cf89 in PHPCodeCompletion::cursorPositionChanged (this=0x891d8d8)
    at phpcodecompletion.cpp:131
#7  0xb4b9d94a in PHPCodeCompletion::qt_invoke (this=0x891d8d8, _id=2, 
    _o=0xbfa40f0c) at phpcodecompletion.moc:86
#8  0xb67a9051 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#9  0xb67a9aec in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#10 0xb70d98a7 in KAction::activated () from /usr/lib/libkdeui.so.4
#11 0xb710f674 in KAction::slotActivated () from /usr/lib/libkdeui.so.4
#12 0xb712b039 in KAction::qt_invoke () from /usr/lib/libkdeui.so.4
#13 0xb67a9051 in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#14 0xb67a9aec in QObject::activate_signal () from /usr/lib/libqt-mt.so.3
#15 0xb6e2a4c5 in KAccelPrivate::menuItemActivated ()
   from /usr/lib/libkdecore.so.4
#16 0xb6e61c08 in KAccelPrivate::emitActivatedSignal ()
   from /usr/lib/libkdecore.so.4
#17 0xb6ebc9ad in KAccelPrivate::eventFilter () from /usr/lib/libkdecore.so.4
#18 0xb67a619a in QObject::activate_filters () from /usr/lib/libqt-mt.so.3
#19 0xb67a6218 in QObject::event () from /usr/lib/libqt-mt.so.3
#20 0xb67e3742 in QWidget::event () from /usr/lib/libqt-mt.so.3
#21 0xb68b58fa in QMainWindow::event () from /usr/lib/libqt-mt.so.3
#22 0xb673ef3e in QApplication::internalNotify () from /usr/lib/libqt-mt.so.3
#23 0xb673f2d6 in QApplication::notify () from /usr/lib/libqt-mt.so.3
#24 0xb6ee3d7d in KApplication::notify () from /usr/lib/libkdecore.so.4
#25 0xb6e619cd in KAccelEventHandler::x11Event ()
   from /usr/lib/libkdecore.so.4
#26 0xb6ee236e in KApplication::x11EventFilter ()
   from /usr/lib/libkdecore.so.4
#27 0xb66bc457 in qt_set_x11_event_filter () from /usr/lib/libqt-mt.so.3
#28 0xb66c974c in QApplication::x11ProcessEvent () from /usr/lib/libqt-mt.so.3
#29 0xb66e34db in QEventLoop::processEvents () from /usr/lib/libqt-mt.so.3
#30 0xb6757a2f in QEventLoop::enterLoop () from /usr/lib/libqt-mt.so.3
#31 0xb6757952 in QEventLoop::exec () from /usr/lib/libqt-mt.so.3
#32 0xb673da4d in QApplication::exec () from /usr/lib/libqt-mt.so.3
#33 0x0804ef86 in main (argc=1, argv=0xbfa41c24) at main.cpp:145

I have compiled:

./configure --enable-debug=full --prefix=/opt/kdevelop --disable-ada --disable-fortran --disable-haskell --disable-java --disable-pascal --disable-perl --disable-python --disable-ruby --disable-antproject --disable-trollproject --disable-clearcase --disable-perforce

Please note I am using UBUNTU and UBUNTU is patching QT libraries a lot.