Bug 32704

Created attachment 45135 [details] Test case - fixed compilation... Sorry, I messed a bit with my files...

Well, the problem is much more generic. When a NPAPI plugin registers itself for a mime type, this mime type will no longer be considered a unsupported content, so WebKit will always try to open it itself. It'll call the plugin to render this content. But when a QWebPluginFactory takes over, then trouble begins. It looks like QWebPluginFactory's plugins can't be used this way, they have to be embedded inside a web page, thus the crashes. You can get this problem on linux too using the flash plugin : just replace http://www.google.fr with the URL of a flash video directly in the source code of the test case, and it'll crash. Here is the backtrace : #0 0x00007ffff778fab0 in typeinfo name for WebCore::QtPluginWidget () from /usr/lib/libQtWebKit.so.4 #1 0x00007ffff729c89e in WebCore::FrameLoaderClientQt::committedLoad (this=0x6db2e0, loader=0x7fffeb8e5080, data=0x75d088 "FWS\005\271\n", length=1067) at ../WebKit/qt/WebCoreSupport/FrameLoaderClientQt.cpp:697 #2 0x00007ffff709f02d in WebCore::DocumentLoader::commitLoad (this=0x7fffeb8e5080, data=0x75d088 "FWS\005\271\n", length=1067) at loader/DocumentLoader.cpp:342 #3 0x00007ffff70dd3e9 in WebCore::ResourceLoader::didReceiveData (this=0x7fffeb90a680, data=0x75d088 "FWS\005\271\n", length=1067, lengthReceived=1067, allAtOnce=120) at loader/ResourceLoader.cpp:248 #4 0x00007ffff70ceacc in WebCore::MainResourceLoader::didReceiveData (this=0x7fffeb90a680, data=0x75d088 "FWS\005\271\n", length=1067, lengthReceived=1067, allAtOnce=<value optimized out>) at loader/MainResourceLoader.cpp:374 #5 0x00007ffff727ce9c in WebCore::QNetworkReplyHandler::forwardData (this=0x6d0c10) at platform/network/qt/QNetworkReplyHandler.cpp:360 #6 0x00007ffff727e598 in WebCore::QNetworkReplyHandler::qt_metacall (this=0x6d0c10, _c=QMetaObject::InvokeMetaMethod, _id=<value optimized out>, _a=<value optimized out>) at .moc/release-shared/moc_QNetworkReplyHandler.cpp:84 #7 0x00007ffff59f3d38 in QObject::event(QEvent*) () from /usr/lib/libQtCore.so.4 #8 0x00007ffff5ef508d in QApplicationPrivate::notify_helper(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #9 0x00007ffff5efb3bd in QApplication::notify(QObject*, QEvent*) () from /usr/lib/libQtGui.so.4 #10 0x00007ffff59e3bdc in QCoreApplication::notifyInternal(QObject*, QEvent*) () from /usr/lib/libQtCore.so.4 #11 0x00007ffff59e4abc in QCoreApplicationPrivate::sendPostedEvents(QObject*, int, QThreadData*) () from /usr/lib/libQtCore.so.4 #12 0x00007ffff5a0db23 in ?? () from /usr/lib/libQtCore.so.4 #13 0x00007ffff30a713a in g_main_context_dispatch () from /lib/libglib-2.0.so.0 #14 0x00007ffff30aa998 in ?? () from /lib/libglib-2.0.so.0 #15 0x00007ffff30aab4c in g_main_context_iteration () from /lib/libglib-2.0.so.0 #16 0x00007ffff5a0d68c in QEventDispatcherGlib::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4 #17 0x00007ffff5fa553f in ?? () from /usr/lib/libQtGui.so.4 #18 0x00007ffff59e24c2 in QEventLoop::processEvents(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4 #19 0x00007ffff59e2894 in QEventLoop::exec(QFlags<QEventLoop::ProcessEventsFlag>) () from /usr/lib/libQtCore.so.4 #20 0x00007ffff59e4d46 in QCoreApplication::exec() () from /usr/lib/libQtCore.so.4 #21 0x0000000000402444 in main (argc=1, argv=0x7fffffffe288) at main.cpp:54

Update the bug flags to reflect my last comment...

Improve the bug report title

Please follow the QtWebKit bug reporting guidelines when reporting bugs. See http://trac.webkit.org/wiki/QtWebKitBugs Specifically: - The 'QtWebKit' component should only be used for bugs/features in the public QtWebKit API layer, not to signify that the bug is specific to the Qt port of WebKit http://trac.webkit.org/wiki/QtWebKitBugs#Component - Add the keyword 'Qt' to signal that it's a Qt-related bug http://trac.webkit.org/wiki/QtWebKitBugs#Keywords

I could reproduce the crash on Windows and the stack trace is the same as bug 29450 so I will resolve this one as duplicate. I was not able to reproduce the crash on linux using the flash video method with your test case on Qt4.6 + WebKit trunk. If you think that the flash crash is a different bug and you have more information about it, it would be interesting if you can add it to this bug report. thanks *** This bug has been marked as a duplicate of bug 29450 ***