[QScintilla] Crash when using QScintilla with IBus

[Luca Beltrame]

Hello,

for non-Latin input I use routinely IBus, an Input Method Editor (IME) written 
in Python (http://code.google.com/p/ibus). Recently I started to experience 
crashes in eric4, every time the completion popup appeared. What I noticed was 
that the crash only happened when IBus was running, If I turned it off, 
everything would work as normal.

I posted a bug on eric's bugtracker, but I was told there, from the backtrace, 
that the issue was likely in QScintilla, and that is why I'm posting here.

Notice: I'm still not sure where the fault lies (QScintilla or IBus). In any 
case, the backtrace is attached.

Please CC me in replies, my mail delivery for this list is off.

-- 
Luca Beltrame - KDE Forums team
KDE Science supporter
GPG key ID: 6E1A4E79
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Application: eric4 (python2.7), signal: Segmentation fault
[Current thread is 1 (Thread 0x7f91a1176700 (LWP 5062))]

Thread 3 (Thread 0x7f9183c1a700 (LWP 5066)):
#0  0x00007f91a00c3503 in poll () from /lib64/libc.so.6
#1  0x00007f919d8ce114 in ?? () from /lib64/libglib-2.0.so.0
#2  0x00007f919d8ce650 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#3  0x00007f919e84d286 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#4  0x00007f919e8218d2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#5  0x00007f919e821ae5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#6  0x00007f919e7367a4 in QThread::exec() () from /usr/lib64/libQtCore.so.4
#7  0x00007f919e803008 in ?? () from /usr/lib64/libQtCore.so.4
#8  0x00007f919e739095 in ?? () from /usr/lib64/libQtCore.so.4
#9  0x00007f91a09caa3f in start_thread () from /lib64/libpthread.so.0
#10 0x00007f91a00cc67d in clone () from /lib64/libc.so.6
#11 0x0000000000000000 in ?? ()

Thread 2 (Thread 0x7f9182bdc700 (LWP 5074)):
#0  0x00007f919e473200 in operator new(unsigned long) () from /usr/lib64/libstdc++.so.6
#1  0x00007f9198e4999e in QList<QPair<unsigned int, unsigned int> >::detach_helper_grow(int, int) () from /usr/lib64/libqscintilla2.so.5
#2  0x00007f9198e49b52 in QList<QPair<unsigned int, unsigned int> >::append(QPair<unsigned int, unsigned int> const&) () from /usr/lib64/libqscintilla2.so.5
#3  0x00007f9198e4777c in QsciAPIsWorker::run() () from /usr/lib64/libqscintilla2.so.5
#4  0x00007f919e739095 in ?? () from /usr/lib64/libQtCore.so.4
#5  0x00007f91a09caa3f in start_thread () from /lib64/libpthread.so.0
#6  0x00007f91a00cc67d in clone () from /lib64/libc.so.6
#7  0x0000000000000000 in ?? ()

Thread 1 (Thread 0x7f91a1176700 (LWP 5062)):
[KCrash Handler]
#6  0xffffffff00000002 in ?? ()
#7  0x00007f919bfd1144 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#8  0x00007f919bfd96fa in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#9  0x00007f9194174d46 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#10 0x00007f9194c10fa6 in sipKApplication::notify(QObject*, QEvent*) () from /usr/lib64/python2.7/site-packages/PyKDE4/kdeui.so
#11 0x00007f919e82247c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#12 0x00007f919c5802f5 in QInputContext::sendEvent(QInputMethodEvent const&) () from /usr/lib64/libQtGui.so.4
#13 0x00007f919c58029d in QInputContext::sendEvent(QInputMethodEvent const&) () from /usr/lib64/libQtGui.so.4
#14 0x00007f91852223ea in IBusInputContext::displayPreeditText(IBus::Pointer<IBus::Text> const&, unsigned int, bool) () from /usr/lib64/qt4/plugins/inputmethods/libqtim-ibus.so
#15 0x00007f91852225f7 in IBusInputContext::slotUpdatePreeditText(IBus::Pointer<IBus::Text> const&, unsigned int, bool) () from /usr/lib64/qt4/plugins/inputmethods/libqtim-ibus.so
#16 0x00007f9185225407 in IBusInputContext::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/qt4/plugins/inputmethods/libqtim-ibus.so
#17 0x00007f919e836a5f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/libQtCore.so.4
#18 0x00007f9184cabdf5 in IBus::InputContext::updatePreeditText(IBus::Pointer<IBus::Text> const&, unsigned int, bool) () from /usr/lib64/libibus-qt.so.1
#19 0x00007f9184c9fed0 in IBus::InputContext::slotUpdatePreeditText(QDBusVariant const&, unsigned int, bool) () from /usr/lib64/libibus-qt.so.1
#20 0x00007f9184cabb7c in IBus::InputContext::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libibus-qt.so.1
#21 0x00007f919e836a5f in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/libQtCore.so.4
#22 0x00007f9184cab5f1 in InputContextProxy::UpdatePreeditText(QDBusVariant const&, unsigned int, bool) () from /usr/lib64/libibus-qt.so.1
#23 0x00007f9184caab23 in InputContextProxy::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libibus-qt.so.1
#24 0x00007f9195e61568 in ?? () from /usr/lib64/libQtDBus.so.4
#25 0x00007f9195e6bb8f in ?? () from /usr/lib64/libQtDBus.so.4
#26 0x00007f919e83637a in QObject::event(QEvent*) () from /usr/lib64/libQtCore.so.4
#27 0x00007f919bfd1144 in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#28 0x00007f919bfd96fa in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/libQtGui.so.4
#29 0x00007f9194174d46 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#30 0x00007f9194c10fa6 in sipKApplication::notify(QObject*, QEvent*) () from /usr/lib64/python2.7/site-packages/PyKDE4/kdeui.so
#31 0x00007f919e82247c in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/libQtCore.so.4
#32 0x00007f919e825c75 in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib64/libQtCore.so.4
#33 0x00007f919e84d093 in ?? () from /usr/lib64/libQtCore.so.4
#34 0x00007f919d8cdbd3 in g_main_context_dispatch () from /lib64/libglib-2.0.so.0
#35 0x00007f919d8ce3b0 in ?? () from /lib64/libglib-2.0.so.0
#36 0x00007f919d8ce650 in g_main_context_iteration () from /lib64/libglib-2.0.so.0
#37 0x00007f919e84d22f in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#38 0x00007f919c076bae in ?? () from /usr/lib64/libQtGui.so.4
#39 0x00007f919e8218d2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#40 0x00007f919e821ae5 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/libQtCore.so.4
#41 0x00007f919e825f2b in QCoreApplication::exec() () from /usr/lib64/libQtCore.so.4
#42 0x00007f919cfa5f9b in ?? () from /usr/lib64/python2.7/site-packages/PyQt4/QtGui.so
#43 0x00007f91a0c9ad83 in PyEval_EvalFrameEx () from /usr/lib64/libpython2.7.so.1.0
#44 0x00007f91a0c9d5b4 in PyEval_EvalFrameEx () from /usr/lib64/libpython2.7.so.1.0
#45 0x00007f91a0ca0c39 in PyEval_EvalCodeEx () from /usr/lib64/libpython2.7.so.1.0
#46 0x00007f91a0ccf572 in PyEval_EvalCode () from /usr/lib64/libpython2.7.so.1.0
#47 0x00007f91a0cddc41 in ?? () from /usr/lib64/libpython2.7.so.1.0
#48 0x00007f91a0cde054 in PyRun_FileExFlags () from /usr/lib64/libpython2.7.so.1.0
#49 0x00007f91a0cde7a9 in PyRun_SimpleFileExFlags () from /usr/lib64/libpython2.7.so.1.0
#50 0x00007f91a0ce818c in Py_Main () from /usr/lib64/libpython2.7.so.1.0
#51 0x00007f91a0017bfd in __libc_start_main () from /lib64/libc.so.6
#52 0x00000000004006e9 in _start ()
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