Regression alert: Random freezing/crashing

[Mark Kretschmann]

On Sat, Dec 18, 2010 at 4:09 PM, Mark Kretschmann <kretschmann at kde.org> wrote:
> On Sat, Dec 18, 2010 at 3:43 PM, Marius <rara at quantentunnel.de> wrote:
>> Heya,
>>
>> on Friday 17 December 2010 23:37 Marius <rara at quantentunnel.de> wrote:
>>> Heya,
>>>
>>> on Friday 17 December 2010 10:45 Mark Kretschmann <kretschmann at kde.org>
>> wrote:
>>> > Ahoy,
>>> >
>>> > several users (including me) have seen an issue in Git Master:
>>> >
>>> > Amarok would randomly freeze, or crash completely, while doing normal
>>> > playback. For me, the debug output always indicates that it happens
>>> > inside one of our applets. The error message is very bizarre.
>>> >
>>> > Something like: "QPixmap cannot be used without initializing
>>> > QApplication. Fatal Error."
>>> >
>>> > Also, I'm getting tons of warnings from QPixmapCache. Possibly related?
>>> >
>>> >
>>> > If anyone can reproduce this, please send debug output and backtrace
>>> > here, thanks!
>>
>> git bisect says the freeze was introduced by Bart's commit
>> 9ab7462612680caa5af99285aca0b8b186ac893e (Implement metadataChanged() to keep
>> the view from resetting)
>
> Wow, thanks a lot for the work.
>
> Bart, any ideas on this?

Incidentally, it just happened again here. Debug output:


amarok: BEGIN: void EngineController::slotAboutToFinish()
amarok:   [EngineController] Track finished completely, updating statistics
amarok:   BEGIN: void ScrobblerAdapter::trackMetadataChanged(Meta::TrackPtr)
amarok:   END__: void
ScrobblerAdapter::trackMetadataChanged(Meta::TrackPtr) [Took: 0s]
amarok:   BEGIN: void OSDWidget::show(const QString&, QImage)
amarok:   END__: void OSDWidget::show(const QString&, QImage) [Took: 0.013s]
amarok:   BEGIN: void Context::ContextView::slotMetadataChanged(Meta::TrackPtr)
amarok:     BEGIN: bool EngineController::isStream()
amarok:     END__: bool EngineController::isStream() [Took: 0s]
amarok:   END__: void
Context::ContextView::slotMetadataChanged(Meta::TrackPtr) [Took: 0s]
amarok:   BEGIN: void PhotosEngine::update(bool)
amarok:     [PhotosEngine] artist name unchanged
amarok:   END__: void PhotosEngine::update(bool) [Took: 0s]
amarok:   BEGIN: void LyricsAppletPrivate::_trackDataChanged(Meta::TrackPtr)
amarok:   END__: void
LyricsAppletPrivate::_trackDataChanged(Meta::TrackPtr) [Took: 0s]
amarok:   BEGIN: virtual void Playlist::Model::metadataChanged(Meta::TrackPtr)
amarok:     BEGIN: void StatusBar::updateTotalPlaylistLength()
amarok:     END__: void StatusBar::updateTotalPlaylistLength() [Took: 0s]
amarok:     [Playlist::Model] Metadata updated for track "Going Wrong
(with Dj Shah feat. Chris Jones)"
amarok:   END__: virtual void
Playlist::Model::metadataChanged(Meta::TrackPtr) [Took: 0s]

[...hangs]

-- 
Mark Kretschmann
Amarok Developer, Software Engineer at KO GmbH
Fellow of the Free Software Foundation Europe
http://amarok.kde.org - http://fsfe.org - http://kogmbh.com