94651 2012-08-21 17:01:56 -0700 ASSERT reached when TextTrack.mode is set to DISABLED 2012-09-06 13:05:42 -0700 1 1 1 Unclassified WebKit Media 420+ Unspecified Unspecified RESOLVED FIXED InRadar P2 Normal --- 1 annacc annacc commit-queue eric.carlson eric feature-media-reviews inferno vcarbune webkit-bug-importer webkit.review.bot oldest_to_newest 701322 0 annacc 2012-08-21 17:01:56 -0700 I believe this is because cues are stuck in the render tree when they become DISABLED. They should be first removed from the render tree and then removed from the activeCues list. 701329 1 159810 annacc 2012-08-21 17:06:31 -0700 Created attachment 159810 Patch I will work on a test for this coming soon. 701372 2 inferno 2012-08-21 17:34:44 -0700 What does the crash stack look like ? Is it a use after free or just a null crash. Null crashes are not security bugs. 701420 3 webkit-bug-importer 2012-08-21 18:14:29 -0700 <rdar://problem/12147493> 702274 4 159810 eric 2012-08-22 13:29:40 -0700 Comment on attachment 159810 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=159810&action=review > Source/WebCore/ChangeLog:11 > + No new tests - coming soon. In this patch? 711990 5 annacc 2012-09-05 05:49:42 -0700 I now have a better understanding of this bug, and a fix! Turns out that when a TextTrack mode is set to 'showing' or 'hidden', the TextTrack's cues are added to HTMLMediaElement's cueTree regardless of whether they might already have been added previously, creating duplicates. When the TextTrack's mode changes to 'disabled' textTrackModeChanged() removes the cues, but not the duplicates. Those cues are then still considered to be active (and they continue have references in m_currentlyActiveCues) and then the ASSERT(cue->isActive()); catches the problem in MediaControlTextTrackContainerElement::updateDisplay(). This was revealed with the new CC button because as the user toggles the button, default tracks start out showingByDefault (i.e. showing), then become hidden (and are added to the cueTree again!), then become showing (added to the cueTree a third time!), and then become disabled, resulting in problems. The fact that default tracks follow this strange path (showingByDefault->hidden->showing->disabled) is a bug in the spec. 712603 6 162355 annacc 2012-09-05 15:42:41 -0700 Created attachment 162355 Patch 712616 7 162355 vcarbune 2012-09-05 15:56:29 -0700 Comment on attachment 162355 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=162355&action=review I think this is a great fix! There's also a high probability that some multiple rendering issues might have been caused at some point by this as well (but the code flow changes probably removed them). > Source/WebCore/ChangeLog:17 > + (WebCore::HTMLMediaElement::textTrackRemoveCues): Mark the track as having Nit: I think you meant mark a track as *not* having. 712647 8 162355 eric.carlson 2012-09-05 16:22:20 -0700 Comment on attachment 162355 Patch View in context: https://bugs.webkit.org/attachment.cgi?id=162355&action=review > Source/WebCore/html/HTMLMediaElement.cpp:1334 > + if (!track->hasCuesInTree()) { > + beginIgnoringTrackDisplayUpdateRequests(); > + for (size_t i = 0; i < cues->length(); ++i) > + textTrackAddCue(cues->item(i)->track(), cues->item(i)); > + track->setHasCuesInTree(true); > + endIgnoringTrackDisplayUpdateRequests(); > + } Won't this prevent *any* cues from being added to the cue tree once this runs? This will be a problem when a script creates a cue and adds it with addCue(), when the loader delivers a track's cue data in more than one chunk, etc. Would it work to have textTrackAddCue() only add a cue if it was not already in the tree? 712977 9 annacc 2012-09-06 00:45:26 -0700 (In reply to comment #8) > (From update of attachment 162355 [details]) > View in context: https://bugs.webkit.org/attachment.cgi?id=162355&action=review > > > Source/WebCore/html/HTMLMediaElement.cpp:1334 > > + if (!track->hasCuesInTree()) { > > + beginIgnoringTrackDisplayUpdateRequests(); > > + for (size_t i = 0; i < cues->length(); ++i) > > + textTrackAddCue(cues->item(i)->track(), cues->item(i)); > > + track->setHasCuesInTree(true); > > + endIgnoringTrackDisplayUpdateRequests(); > > + } > > Won't this prevent *any* cues from being added to the cue tree once this runs? This will be a problem when a script creates a cue and adds it with addCue(), when the loader delivers a track's cue data in more than one chunk, etc. Good call. This isn't a good idea considering batching of cues. Will revise. > Would it work to have textTrackAddCue() only add a cue if it was not already in the tree? Definitely. I was looking for a more efficient route than checking for each cue. But, I think that checking the tree before each cue is added is necessary. New patch on the way! 713161 10 162473 annacc 2012-09-06 04:26:20 -0700 Created attachment 162473 perform check in textTrackAddCue() 713606 11 162473 webkit.review.bot 2012-09-06 13:05:37 -0700 Comment on attachment 162473 perform check in textTrackAddCue() Clearing flags on attachment: 162473 Committed r127779: <http://trac.webkit.org/changeset/127779> 713607 12 webkit.review.bot 2012-09-06 13:05:42 -0700 All reviewed patches have been landed. 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