Bug 83949 – ASSERT in notifyChildInserted when HTMLMediaElement is removed from tree

• Component: Media
• Status: RESOLVED FIXED

[Eric Carlson]

When running layout tests in a debug build, I occasionally get a crash when "ASSERT(!eventDispatchForbidden())" fires in notifyChildInserted:

    WebCore::notifyChildInserted(WebCore::Node*) + 67 (ContainerNode.cpp:1012)
    WebCore::updateTreeAfterInsertion(WebCore::ContainerNode*, WebCore::Node*, bool) + 254 (ContainerNode.cpp:1099)
    WebCore::ContainerNode::appendChild(WTF::PassRefPtr<WebCore::Node>, int&, bool) + 587 (ContainerNode.cpp:570)
    WebCore::replaceChildrenWithText(WebCore::ContainerNode*, WTF::String const&, int&) + 427 (markup.cpp:1072)
    WebCore::HTMLElement::setInnerText(WTF::String const&, int&) + 403 (HTMLElement.cpp:447)
    WebCore::MediaControlRootElement::updateTimeDisplay() + 186 (MediaControlRootElement.cpp:411)
    WebCore::MediaControlRootElement::playbackStopped() + 114 (MediaControlRootElement.cpp:395)
    WebCore::HTMLMediaElement::updatePlayState() + 920 (HTMLMediaElement.cpp:3534)
    WebCore::HTMLMediaElement::pauseInternal() + 207 (HTMLMediaElement.cpp:2274)
    WebCore::HTMLMediaElement::pause() + 94 (HTMLMediaElement.cpp:2254)
    WebCore::HTMLMediaElement::removedFromDocument() + 72 (HTMLMediaElement.cpp:507)
    WebCore::ContainerNode::removedFromDocument() + 254 (ContainerNode.cpp:729)
    WebCore::Element::removedFromDocument() + 294 (Element.cpp:923)

The problem is that the spec says that a media element must pause when removed from the tree, and when the controls update the text of one of the time displays changes.

[Eric Carlson]

Created attachment 137225 [details]
Proposed patch

[Radar WebKit Bug Importer]

<rdar://problem/11251561>

[WebKit Review Bot]

Attachment 137225 [details] did not pass style-queue:

Failed to run "['Tools/Scripts/check-webkit-style', '--diff-files', u'Source/WebCore/ChangeLog', u'Source/WebCor..." exit_code: 1
Source/WebCore/ChangeLog:8:  You should remove the 'No new tests' and either add and list tests, or explain why no new tests were possible.  [changelog/nonewtests] [5]
Total errors found: 1 in 2 files


If any of these errors are false positives, please file a bug against check-webkit-style.

[WebKit Review Bot]

Comment on attachment 137225 [details]
Proposed patch

Attachment 137225 [details] did not pass chromium-ews (chromium-xvfb):
Output: http://queues.webkit.org/results/12410019

New failing tests:
fullscreen/video-controls-override.html

[WebKit Review Bot]

Created attachment 137230 [details]
Archive of layout-test-results from ec2-cr-linux-03

The attached test failures were seen while running run-webkit-tests on the chromium-ews.
Bot: ec2-cr-linux-03  Port: <class 'webkitpy.common.config.ports.ChromiumXVFBPort'>  Platform: Linux-2.6.35-28-virtual-x86_64-with-Ubuntu-10.10-maverick

[Eric Carlson]

Created attachment 137273 [details]
Updated patch.

[WebKit Review Bot]

Comment on attachment 137273 [details]
Updated patch.

Clearing flags on attachment: 137273

Committed r114258: <http://trac.webkit.org/changeset/114258>

[WebKit Review Bot]

All reviewed patches have been landed.  Closing bug.