Application: kate (3.7.3)
KDE Platform Version: 4.7.3 (4.7.3) (Compiled from sources)
Qt Version: 4.7.4
Operating System: Linux 3.1.5-brn2 x86_64
Distribution: "Gentoo Base System release 2.0.3"

-- Information about the crash:
- What I was doing when the application crashed:
Having 4 big new files open ( 2 XMLs and 2 java ) I replaced, using regex, all occurrences of "\n+" for "\n" in one of the java files.
After the replace took place kate crashed before I could see the result.

-- Backtrace:
Application: Kate (kate), signal: Segmentation fault
[Current thread is 1 (Thread 0x7ffff7fb1780 (LWP 3294))]

Thread 3 (Thread 0x7ffff2fb3700 (LWP 3295)):
#0  0x000000300240bc8c in pthread_cond_wait () from /lib64/libpthread.so.0
#1  0x000000301d792ee4 in QTWTF::TCMalloc_PageHeap::scavengerThread() () from /usr/lib64/qt4/libQtScript.so.4
#2  0x000000301d792f19 in QTWTF::TCMalloc_PageHeap::runScavengerThread(void*) () from /usr/lib64/qt4/libQtScript.so.4
#3  0x0000003002406e0c in start_thread () from /lib64/libpthread.so.0
#4  0x00000030018e675d in clone () from /lib64/libc.so.6

Thread 2 (Thread 0x7ffff034f700 (LWP 3332)):
#0  0x00000030018dc203 in poll () from /lib64/libc.so.6
#1  0x0000003005842ea4 in g_main_context_iterate.clone.6 () from /usr/lib64/libglib-2.0.so.0
#2  0x00000030058433dd in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#3  0x000000300658a936 in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#4  0x000000300655e6c2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#5  0x000000300655e907 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#6  0x0000003006471884 in QThread::exec() () from /usr/lib64/qt4/libQtCore.so.4
#7  0x000000300653fd18 in QInotifyFileSystemWatcherEngine::run() () from /usr/lib64/qt4/libQtCore.so.4
#8  0x0000003006474105 in QThreadPrivate::start(void*) () from /usr/lib64/qt4/libQtCore.so.4
#9  0x0000003002406e0c in start_thread () from /lib64/libpthread.so.0
#10 0x00000030018e675d in clone () from /lib64/libc.so.6

Thread 1 (Thread 0x7ffff7fb1780 (LWP 3294)):
[KCrash Handler]
#6  0x00000030068931a0 in QString::shared_null () from /usr/lib64/qt4/libQtCore.so.4
#7  0x00007ffff40c3d3b in Kate::TextBuffer::rangesForLine(int, KTextEditor::View*, bool) const () from /usr/lib64/libkatepartinterfaces.so.4
#8  0x00007ffff41573c0 in KateRenderer::decorationsForLine(QSharedPointer<Kate::TextLineData> const&, int, bool, KateRenderRange*, bool) const () from /usr/lib64/libkatepartinterfaces.so.4
#9  0x00007ffff4158d5b in KateRenderer::layoutLine(KSharedPtr<KateLineLayout>, int, bool) const () from /usr/lib64/libkatepartinterfaces.so.4
#10 0x00007ffff415d5e9 in KateLayoutCache::line(int, int) () from /usr/lib64/libkatepartinterfaces.so.4
#11 0x00007ffff415ec37 in KateLayoutCache::updateViewCache(KTextEditor::Cursor const&, int, int) () from /usr/lib64/libkatepartinterfaces.so.4
#12 0x00007ffff41ac900 in KateViewInternal::doUpdateView(bool, int) () from /usr/lib64/libkatepartinterfaces.so.4
#13 0x00007ffff41ad09c in KateViewInternal::updateView(bool, int) () from /usr/lib64/libkatepartinterfaces.so.4
#14 0x00007ffff419c445 in KateView::visibleRange() () from /usr/lib64/libkatepartinterfaces.so.4
#15 0x00007ffff41f6065 in KateOnTheFlyChecker::textRemoved(KTextEditor::Document*, KTextEditor::Range const&) () from /usr/lib64/libkatepartinterfaces.so.4
#16 0x00007ffff41fad7c in KateOnTheFlyChecker::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkatepartinterfaces.so.4
#17 0x0000003006573d27 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#18 0x0000003023822947 in KTextEditor::Document::textRemoved(KTextEditor::Document*, KTextEditor::Range const&) () from /usr/lib64/libktexteditor.so.4
#19 0x00007ffff412a604 in KateDocument::editRemoveLines(int, int) () from /usr/lib64/libkatepartinterfaces.so.4
#20 0x00007ffff412af44 in KateDocument::removeText(KTextEditor::Range const&, bool) () from /usr/lib64/libkatepartinterfaces.so.4
#21 0x00007ffff4122fcb in KateDocument::replaceText(KTextEditor::Range const&, QString const&, bool) () from /usr/lib64/libkatepartinterfaces.so.4
#22 0x00007ffff41658ad in KateMatch::replace(QString const&, bool, int) () from /usr/lib64/libkatepartinterfaces.so.4
#23 0x00007ffff416d1e0 in KateSearchBar::findAll(KTextEditor::Range, QString const*) () from /usr/lib64/libkatepartinterfaces.so.4
#24 0x00007ffff416db00 in KateSearchBar::replaceAll() () from /usr/lib64/libkatepartinterfaces.so.4
#25 0x00007ffff416eea4 in KateSearchBar::qt_metacall(QMetaObject::Call, int, void**) () from /usr/lib64/libkatepartinterfaces.so.4
#26 0x0000003006573d27 in QMetaObject::activate(QObject*, QMetaObject const*, int, void**) () from /usr/lib64/qt4/libQtCore.so.4
#27 0x000000300a61fc62 in QAbstractButton::clicked(bool) () from /usr/lib64/qt4/libQtGui.so.4
#28 0x000000300a360d3b in QAbstractButtonPrivate::emitClicked() () from /usr/lib64/qt4/libQtGui.so.4
#29 0x000000300a3622fb in QAbstractButtonPrivate::click() () from /usr/lib64/qt4/libQtGui.so.4
#30 0x000000300a36256c in QAbstractButton::mouseReleaseEvent(QMouseEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#31 0x000000300a009db8 in QWidget::event(QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#32 0x0000003009fb787e in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#33 0x0000003009fbcf30 in QApplication::notify(QObject*, QEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#34 0x000000300cc4b646 in KApplication::notify(QObject*, QEvent*) () from /usr/lib64/libkdeui.so.5
#35 0x000000300655f2fb in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib64/qt4/libQtCore.so.4
#36 0x0000003009fb88b2 in QApplicationPrivate::sendMouseEvent(QWidget*, QMouseEvent*, QWidget*, QWidget*, QWidget**, QPointer<QWidget>&, bool) () from /usr/lib64/qt4/libQtGui.so.4
#37 0x000000300a038608 in QETWidget::translateMouseEvent(_XEvent const*) () from /usr/lib64/qt4/libQtGui.so.4
#38 0x000000300a036c9c in QApplication::x11ProcessEvent(_XEvent*) () from /usr/lib64/qt4/libQtGui.so.4
#39 0x000000300a05ead2 in x11EventSourceDispatch(_GSource*, int (*)(void*), void*) () from /usr/lib64/qt4/libQtGui.so.4
#40 0x0000003005842963 in g_main_context_dispatch () from /usr/lib64/libglib-2.0.so.0
#41 0x0000003005843140 in g_main_context_iterate.clone.6 () from /usr/lib64/libglib-2.0.so.0
#42 0x00000030058433dd in g_main_context_iteration () from /usr/lib64/libglib-2.0.so.0
#43 0x000000300658a8df in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#44 0x000000300a05e780 in QGuiEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtGui.so.4
#45 0x000000300655e6c2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#46 0x000000300655e907 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib64/qt4/libQtCore.so.4
#47 0x0000003006562dcb in QCoreApplication::exec() () from /usr/lib64/qt4/libQtCore.so.4
#48 0x000000309660722d in kdemain () from /usr/lib64/libkdeinit4_kate.so
#49 0x000000300181eebd in __libc_start_main () from /lib64/libc.so.6
#50 0x00000000004006c9 in _start ()

Reported using DrKonqi