Created attachment 62602 [details]
Simple file to reproduce the crash

Version:           git master (using KDE 4.7.0) 
OS:                Linux

When I click the documentation link in the completion widget for PHP, KDevelop crashes.

Reproducible: Always

Steps to Reproduce:
1 Type an incomplete php statement
2 Invoke code completion and show the expansion widget
3 Click on the documentation link and it crashes

I have attached a simple PHP file to reproduce it. Invoke the code completion for the third line and then expand 'saveXml' item and open the documentation.

Actual Results:  
KDevelop crashes

Expected Results:  
Open the documentation widgeteve

Application: KDevelop (kdevelop), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f83c1630760 (LWP 4168))]

Thread 9 (Thread 0x7f83aca49700 (LWP 4172)):
#0  0x00007f83be53986b in pthread_cond_timedwait () from /lib64/libpthread.so.0
#1  0x00007f83bfac7151 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007f83bbeb364a in KDevelop::DUChainPrivate::CleanupThread::run (this=0x30e8840) at /var/tmp/portage/dev-util/kdevplatform-9999/work/kdevplatform-9999/language/duchain/duchain.cpp:282
#3  0x00007f83bfac6b15 in QThreadPrivate::start(void*) () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007f83be534d1c in start_thread () from /lib64/libpthread.so.0
#5  0x00007f83be81f89d in clone () from /lib64/libc.so.6

Thread 8 (Thread 0x7f83a25f7700 (LWP 4174)):
#0  0xffffffffff600136 in ?? ()
#1  0x00007f83a25f6b20 in ?? ()
#2  0x00007fffa55ff79e in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 7 (Thread 0x7f839a5e4700 (LWP 4177)):
#0  0x00007f83be5394ec in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007f83ad7cbd84 in QTWTF::TCMalloc_PageHeap::scavengerThread() () from /usr/lib64/qt4/libQtScript.so.4
#2  0x00007f83ad7cbdb9 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /usr/lib64/qt4/libQtScript.so.4
#3  0x00007f83be534d1c in start_thread () from /lib64/libpthread.so.0
#4  0x00007f83be81f89d in clone () from /lib64/libc.so.6

Thread 6 (Thread 0x7f839987f700 (LWP 4185)):
#0  0xffffffffff600136 in ?? ()
#1  0x00007f839987eae0 in ?? ()
#2  0x00007fffa55ff79e in ?? ()
Backtrace stopped: previous frame identical to this frame (corrupt stack?)

Thread 5 (Thread 0x7f8399076700 (LWP 4186)):
#0  0x00007f83be5394ec in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007f83b66199e4 in WTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /usr/lib64/qt4/libQtWebKit.so.4
#2  0x00007f83be534d1c in start_thread () from /lib64/libpthread.so.0
#3  0x00007f83be81f89d in clone () from /lib64/libc.so.6

Thread 4 (Thread 0x7f8394f2e700 (LWP 4438)):
#0  0x00007f83be5394ec in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007f83bfac71e3 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007f83b6e6bf24 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned(ThreadWeaver::Thread*) () from /usr/lib64/libthreadweaver.so.4
#3  0x00007f83b6e6e593 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, ThreadWeaver::Job*) () from /usr/lib64/libthreadweaver.so.4
#4  0x00007f83b6e6e5ac in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, ThreadWeaver::Job*) () from /usr/lib64/libthreadweaver.so.4
#5  0x00007f83b6e6d387 in ThreadWeaver::ThreadRunHelper::run(ThreadWeaver::WeaverImpl*, ThreadWeaver::Thread*) () from /usr/lib64/libthreadweaver.so.4
#6  0x00007f83b6e6d418 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#7  0x00007f83bfac6b15 in QThreadPrivate::start(void*) () from /usr/lib64/qt4/libQtCore.so.4
#8  0x00007f83be534d1c in start_thread () from /lib64/libpthread.so.0
#9  0x00007f83be81f89d in clone () from /lib64/libc.so.6

Thread 3 (Thread 0x7f839572f700 (LWP 4439)):
#0  0x00007f83be5394ec in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x00007f83bfac71e3 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007f83b6e6bf24 in ThreadWeaver::WeaverImpl::blockThreadUntilJobsAreBeingAssigned(ThreadWeaver::Thread*) () from /usr/lib64/libthreadweaver.so.4
#3  0x00007f83b6e6e593 in ThreadWeaver::WorkingHardState::applyForWork(ThreadWeaver::Thread*, ThreadWeaver::Job*) () from /usr/lib64/libthreadweaver.so.4
#4  0x00007f83b6e6d387 in ThreadWeaver::ThreadRunHelper::run(ThreadWeaver::WeaverImpl*, ThreadWeaver::Thread*) () from /usr/lib64/libthreadweaver.so.4
#5  0x00007f83b6e6d418 in ThreadWeaver::Thread::run() () from /usr/lib64/libthreadweaver.so.4
#6  0x00007f83bfac6b15 in QThreadPrivate::start(void*) () from /usr/lib64/qt4/libQtCore.so.4
#7  0x00007f83be534d1c in start_thread () from /lib64/libpthread.so.0
#8  0x00007f83be81f89d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7f8397ece700 (LWP 4953)):
#0  0x00007f83be53986b in pthread_cond_timedwait () from /lib64/libpthread.so.0
#1  0x00007f83bfac7151 in QWaitCondition::wait(QMutex*, unsigned long) () from /usr/lib64/qt4/libQtCore.so.4
#2  0x00007f83bfabbcaf in QThreadPoolThread::run() () from /usr/lib64/qt4/libQtCore.so.4
#3  0x00007f83bfac6b15 in QThreadPrivate::start(void*) () from /usr/lib64/qt4/libQtCore.so.4
#4  0x00007f83be534d1c in start_thread () from /lib64/libpthread.so.0
#5  0x00007f83be81f89d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7f83c1630760 (LWP 4168)):
[KCrash Handler]
#6  0x00007f83bf1dc100 in QTextControl::textInteractionFlags() const () from /usr/lib64/qt4/libQtGui.so.4
#7  0x00007f83bf3e365a in QTextEdit::isReadOnly() const () from /usr/lib64/qt4/libQtGui.so.4
#8  0x00007f83bf3e46f4 in QTextEdit::mouseReleaseEvent(QMouseEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#9  0x00007f83beff4603 in QWidget::event(QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#10 0x00007f83bf3784c6 in QFrame::event(QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#11 0x00007f83bfbac606 in QCoreApplicationPrivate::sendThroughObjectEventFilters(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#12 0x00007f83befa39f1 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#13 0x00007f83befa8d84 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#14 0x00007f83c03ab156 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#15 0x00007f83bfbac483 in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#16 0x00007f83befa49e6 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib64/qt4/libQtGui.so.4
#17 0x00007f83bf022020 in QETWidget::translateMouseEvent(_XEvent const*) () from /usr/lib64/qt4/libQtGui.so.4
#18 0x00007f83bf020709 in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#19 0x00007f83bf04779a in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/qt4/libQtGui.so.4
#20 0x00007f83b92dd982 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#21 0x00007f83b92de130 in g_main_context_iterate.clone.6 () from /usr/lib64/libglib-2.0.so.0
#22 0x00007f83b92de3cd in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#23 0x00007f83bfbd6a7f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#24 0x00007f83bf04744e in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtGui.so.4
#25 0x00007f83bfbab8a2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#26 0x00007f83bfbabae4 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#27 0x00007f83bfbafe63 in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#28 0x0000000000409f20 in main (argc=3, argv=0x7fff00000000) at /var/tmp/portage/dev-util/kdevelop-9999/work/kdevelop-9999/app/main.cpp:474