[Webkit-unassigned] [Bug 167159] New: Crash when changing video subtitles.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=167159

            Bug ID: 167159
           Summary: Crash when changing video subtitles.
    Classification: Unclassified
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: macOS 10.12
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: WebCore Misc.
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: pvollan at apple.com

When changing video captions during playback in MiniBrowser, I get an access violation crash with the stack trace:

0   WebCore::Element::getBoundingClientRect() + 32
1   WebCore::VTTRegion::willRemoveTextTrackCueBox(WebCore::VTTCueBox*) + 44
2   WebCore::VTTRegion::willRemoveTextTrackCueBox(WebCore::VTTCueBox*) + 44
3   WebCore::VTTCue::removeDisplayTree() + 72
4   WebCore::TextTrack::setMode(WTF::AtomicString const&) + 320
5   WebCore::HTMLMediaElement::setSelectedTextTrack(WebCore::TextTrack*) + 308

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