QtWebKit crashes sometimes in QSvgHandler. We should have a look at QSvgHandler if we can find the cause of the crash. We could also probably get rid of QtSvg altogether and use WebCore to render SVG. Here is the trace of the crash. 0 QtSvg 0x000000010f7f4a52 QSvgHandler::characters(QStringRef const&) + 146 1 QtSvg 0x000000010f7f53c7 QSvgHandler::parse() + 679 2 QtSvg 0x000000010f7f55a5 QSvgHandler::init() + 197 3 QtSvg 0x000000010f7f58ab QSvgHandler::QSvgHandler(QByteArray const&) + 187 4 QtSvg 0x000000010f805432 QSvgTinyDocument::load(QByteArray const&) + 146 5 QtSvg 0x000000010f806448 QSvgRenderer::load(QByteArray const&) + 56 6 libqsvg.dylib 0x000000010dae5442 QSvgIOHandlerPrivate::load(QIODevice*) + 146 7 libqsvg.dylib 0x000000010dae5670 QSvgIOHandler::option(QImageIOHandler::ImageOption) const + 192 8 QtGui 0x0000000101b67ee9 QImageReader::size() const + 121 9 QtWebKit 0x00000001009456d8 WebCore::ImageDecoderQt::internalDecodeSize() + 24 10 QtWebKit 0x00000001009457ce WebCore::ImageDecoderQt::isSizeAvailable() + 46 11 QtWebKit 0x00000001007e7ad4 WebCore::ImageSource::isSizeAvailable() + 20 12 QtWebKit 0x00000001007d5eb0 WebCore::BitmapImage::isSizeAvailable() + 32 13 QtWebKit 0x00000001007d6218 WebCore::BitmapImage::dataChanged(bool) + 72 14 QtWebKit 0x00000001007e767d WebCore::Image::setData(WTF::PassRefPtr<WebCore::SharedBuffer>, bool) + 109 15 QtWebKit 0x00000001006f1dcc WebCore::CachedImage::data(WTF::PassRefPtr<WebCore::SharedBuffer>, bool) + 124 16 QtWebKit 0x0000000100732c4f WebCore::Loader::Host::didFinishLoading(WebCore::SubresourceLoader*) + 367 17 QtWebKit 0x000000010074b3e4 WebCore::SubresourceLoader::didFinishLoading() + 52 18 QtWebKit 0x00000001009505a0 WebCore::QNetworkReplyHandler::finish() + 160 19 QtWebKit 0x0000000100950f70 WebCore::QNetworkReplyHandler::qt_metacall(QMetaObject::Call, int, void**) + 192 20 QtCore 0x00000001028a69cb QMetaObject::activate(QObject*, QMetaObject const*, int, void**) + 603 21 QtNetwork 0x0000000102712d79 QNetworkReplyImplPrivate::finished() + 473 22 QtNetwork 0x00000001026ff1e0 QNetworkAccessHttpBackend::replyFinished() + 640 23 QtNetwork 0x000000010271252f QNetworkReplyImplPrivate::handleNotifications() + 399 24 QtNetwork 0x0000000102712579 QNetworkReplyImpl::event(QEvent*) + 41 25 QtGui 0x0000000101aca4fd QApplicationPrivate::notify_helper(QObject*, QEvent*) + 189 26 QtGui 0x0000000101ad1ffe QApplication::notify(QObject*, QEvent*) + 2094 27 com.yourcompany.light 0x000000010000a63c WebApplication::notify(QObject*, QEvent*) + 188 (webapplication.cpp:72) 28 QtCore 0x000000010289ffec QCoreApplication::notifyInternal(QObject*, QEvent*) + 124 29 QtCore 0x000000010297b64d QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) + 701 30 com.apple.CoreFoundation 0x00007fff84958f21 __CFRunLoopDoSources0 + 1361 31 com.apple.CoreFoundation 0x00007fff84957119 __CFRunLoopRun + 873 32 com.apple.CoreFoundation 0x00007fff849568df CFRunLoopRunSpecific + 575 33 com.apple.HIToolbox 0x00007fff83bfdada RunCurrentEventLoopInMode + 333 34 com.apple.HIToolbox 0x00007fff83bfd8df ReceiveNextEventCommon + 310 35 com.apple.HIToolbox 0x00007fff83bfd798 BlockUntilNextEventMatchingListInMode + 59 36 com.apple.AppKit 0x00007fff863b1a2a _DPSNextEvent + 708 37 com.apple.AppKit 0x00007fff863b1379 -[NSApplication nextEventMatchingMask:untilDate:inMode:dequeue:] + 155 38 com.apple.AppKit 0x00007fff8637705b -[NSApplication run] + 395 39 QtGui 0x0000000101a874c4 QEventDispatcherMac::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 1588 40 QtCore 0x0000000102979ff4 QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) + 68 41 QtCore 0x000000010297a304 QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) + 180 42 QtCore 0x000000010297b94c QCoreApplication::exec() + 188 43 com.yourcompany.light 0x0000000100005b40 main + 433 (main.cpp:36) 44 com.yourcompany.light 0x0000000100003120 start + 52