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[Olivier Tilloy <olivier.tilloy@xxxxxxxxxxxxx>]

** Changed in: webbrowser-app
       Status: In Progress => Fix Released

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https://bugs.launchpad.net/bugs/1294219

Title:
  Crash in WebviewThumbnailer::~WebviewThumbnailer() with Qt 5.2

Status in Web Browser App:
  Fix Released
Status in “webbrowser-app” package in Ubuntu:
  Fix Released

Bug description:
  I’m seeing this crash fairly regularly (although it’s not 100% reliably reproducible) since the update to Qt 5.2 (it was not occurring before). Running on x86-64 desktop.
  Steps to reproduce:
   - launch the browser app
   - open the activity view, click on the new tab button
   - type in any URL and validate, wait for the new page to finish loading
   - open the activity view again
   - long press on any of the two open tabs to switch to tabs closing mode
   - click the last open tab: the crash happens there

  Here’s the backtrace I’m getting when run in gdb:

  #0  QOpenGLContext::shareGroup (this=this@entry=0x0) at kernel/qopenglcontext.cpp:896
  #1  0x00007ffff73eda28 in value<QOpenGLFunctionsPrivateEx> (context=0x0, 
      this=0x7ffff7733a80 <(anonymous namespace)::Q_QGS_qt_gl_functions_resource::innerFunction()::holder>)
      at ../../include/QtGui/5.2.1/QtGui/private/../../../../../src/gui/kernel/qopenglcontext_p.h:173
  #2  qt_gl_functions (context=context@entry=0x0) at opengl/qopenglfunctions.cpp:197
  #3  0x00007ffff73f854f in (anonymous namespace)::Resolver<QOpenGLFunctionsPrivate, void (*)(int, unsigned int const*), 3, void>::operator()<int, unsigned int const*> (this=this@entry=0x7fffffffd300, p1=p1@entry=1, 
      p2=p2@entry=0x7fff647b7e20) at opengl/qopenglfunctions.cpp:1764
  #4  0x00007ffff73f89f2 in qopenglfResolveDeleteBuffers (n=1, buffers=0x7fff647b7e20)
      at opengl/qopenglfunctions.cpp:1959
  #5  0x00007ffff6c6d856 in glDeleteBuffers (buffers=0x7fff647b7e20, n=1, this=<optimized out>)
      at /usr/include/qt5/QtGui/qopenglfunctions.h:643
  #6  qsg_wipeBuffer (funcs=<optimized out>, buffer=0x7fff647b7e20) at scenegraph/coreapi/qsgbatchrenderer.cpp:822
  #7  QSGBatchRenderer::qsg_wipeBatch (batch=0x7fff647b7e00, funcs=<optimized out>)
      at scenegraph/coreapi/qsgbatchrenderer.cpp:828
  #8  0x00007ffff6c71f33 in QSGBatchRenderer::Renderer::~Renderer (this=0x7fff646aaa10, __in_chrg=<optimized out>)
      at scenegraph/coreapi/qsgbatchrenderer.cpp:835
  #9  0x00007ffff6c72279 in QSGBatchRenderer::Renderer::~Renderer (this=0x7fff646aaa10, __in_chrg=<optimized out>)
      at scenegraph/coreapi/qsgbatchrenderer.cpp:850
  #10 0x000000000043d86e in WebviewThumbnailer::~WebviewThumbnailer() ()
  #11 0x000000000043b657 in QQmlPrivate::QQmlElement<WebviewThumbnailer>::~QQmlElement() ()
  #12 0x000000000043b6b0 in QQmlPrivate::QQmlElement<WebviewThumbnailer>::~QQmlElement() ()
  #13 0x00007ffff79c3c9c in QObjectPrivate::deleteChildren (this=this@entry=0x24f0db0) at kernel/qobject.cpp:1841
  #14 0x00007ffff79ca632 in QObject::~QObject (this=<optimized out>, __in_chrg=<optimized out>) at kernel/qobject.cpp:934
  #15 0x00007fffd044b6d6 in ?? ()
     from /usr/lib/x86_64-linux-gnu/qt5/qml/QtWebKit/experimental/libqmlwebkitexperimentalplugin.so
  #16 0x00007ffff79c4278 in QObject::event (this=this@entry=0x256b120, e=e@entry=0x28703f0) at kernel/qobject.cpp:1138
  #17 0x00007ffff6cc0ae3 in QQuickItem::event (this=0x256b120, ev=0x28703f0) at items/qquickitem.cpp:6984
  #18 0x00007ffff395bc2c in QApplicationPrivate::notify_helper (this=this@entry=0x665f70, 
      receiver=receiver@entry=0x256b120, e=e@entry=0x28703f0) at kernel/qapplication.cpp:3486
  #19 0x00007ffff3960df6 in QApplication::notify (this=0x7fffffffdc40, receiver=0x256b120, e=0x28703f0)
      at kernel/qapplication.cpp:3236
  #20 0x00007ffff799bc2d in QCoreApplication::notifyInternal (this=0x7fffffffdc40, receiver=0x256b120, 
      event=event@entry=0x28703f0) at kernel/qcoreapplication.cpp:881
  #21 0x00007ffff799de07 in sendEvent (event=0x28703f0, receiver=<optimized out>)
      at ../../include/QtCore/../../src/corelib/kernel/qcoreapplication.h:232
  #22 QCoreApplicationPrivate::sendPostedEvents (receiver=receiver@entry=0x0, event_type=event_type@entry=0, 
      data=0x6660d0) at kernel/qcoreapplication.cpp:1485
  #23 0x00007ffff799e433 in QCoreApplication::sendPostedEvents (receiver=receiver@entry=0x0, 
      event_type=event_type@entry=0) at kernel/qcoreapplication.cpp:1343
  #24 0x00007ffff79e8cd3 in postEventSourceDispatch (s=0x6ab430) at kernel/qeventdispatcher_glib.cpp:279
  #25 0x00007ffff1b81e04 in g_main_context_dispatch () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #26 0x00007ffff1b82048 in ?? () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #27 0x00007ffff1b820ec in g_main_context_iteration () from /lib/x86_64-linux-gnu/libglib-2.0.so.0
  #28 0x00007ffff79e898c in QEventDispatcherGlib::processEvents (this=0x67f830, flags=...)
      at kernel/qeventdispatcher_glib.cpp:426
  #29 0x00007ffff799a96b in QEventLoop::exec (this=this@entry=0x7fffffffdba0, flags=..., flags@entry=...)
      at kernel/qeventloop.cpp:212
  #30 0x00007ffff79a10e1 in QCoreApplication::exec () at kernel/qcoreapplication.cpp:1134
  #31 0x0000000000442811 in BrowserApplication::run() ()
  #32 0x0000000000435570 in main ()

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