[Webkit-unassigned] [Bug 251835] New: The Document object is leaked on some pages using media (like YouTube.com)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251835

            Bug ID: 251835
           Summary: The Document object is leaked on some pages using
                    media (like YouTube.com)
           Product: WebKit
           Version: WebKit Local Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Media
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: simon.fraser at apple.com

Launch a recent Safari or MiniBrowser build from terminal (so you can see the output), and visit a YouTube.com video page (or a page with YouTube.com in a subframe). In that tab, navigate to about:blank, then trigger the low memory handler (to clear caches):
> notifyutil -p "org.WebKit.lowMemory"
then dump the list of live documents:
> notifyutil -p  "com.apple.WebKit.showAllDocuments"

Note that the YouTube document, and probably several other documents are listed.

Tests also show leaked Documents:

run-webkit-tests media --world-leaks shows that these tests trigger Document leaks:

media/W3C/audio/error/error_onerror_called_on_bogus_source.html
media/W3C/audio/networkState/networkState_during_loadstart.html
media/W3C/audio/src/src_reflects_attribute_not_source_elements.html
media/W3C/video/canPlayType/canPlayType_application_octet_stream_with_codecs_1.html
media/W3C/video/error/error_onerror_called_on_bogus_source.html
media/W3C/video/events/event_canplay.html
media/media-session/actionHandlerInternalMappings.html
media/media-session/mock-actionHandlers.html
media/media-session/user-gesture-action-handlers.html
media/modern-media-controls/media-controller/media-controller-auto-hide-mouse-enter-and-mouse-leave.html
media/modern-media-controls/overflow-support/playback-speed.html
media/modern-media-controls/time-control/time-control.html
media/modern-media-controls/tracks-support/text-track-selected-via-media-api.html
media/picture-in-picture/picture-in-picture-interruption.html
media/track/video-track-alternate-groups.html
platform/mac/media/encrypted-media/fps-generateRequest.html

See https://trac.webkit.org/wiki/Abandoned%20documents for Document leaks info

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