[Webkit-unassigned] [Bug 258185] New: ASSERTION FAILED: firstChild():[ macOS ] http/tests/media/hls/track-in-band-ext-x-date-range-start-time.html is flaky crash.

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=258185

            Bug ID: 258185
           Summary: ASSERTION FAILED: firstChild():[ macOS ]
                    http/tests/media/hls/track-in-band-ext-x-date-range-st
                    art-time.html is flaky crash.
           Product: WebKit
           Version: Other
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: bharris9 at apple.com

http/tests/media/hls/track-in-band-ext-x-date-range-start-time.html

is a flaky crash on macOS Debug queues as well as a flaky test failure on iOS 16. 

HISTORY:
https://results.webkit.org/?suite=layout-tests&test=http%2Ftests%2Fmedia%2Fhls%2Ftrack-in-band-ext-x-date-range-start-time.html


STDERR TEXT:
ASSERTION FAILED: firstChild()
/Volumes/Data/worker/Apple-Ventura-Debug-Build/build/Source/WebCore/rendering/RenderVTTCue.cpp(79) : bool WebCore::RenderVTTCue::initializeLayoutParameters(WebCore::LayoutUnit &, WebCore::LayoutUnit &)
1   0x153c7e060 WTFCrash
2   0x109f81fe0 WebCore::NetworkResourcesData::ResourceData::hasContent() const
3   0x10b169bfc WebCore::RenderVTTCue::initializeLayoutParameters(WebCore::LayoutUnit&, WebCore::LayoutUnit&)
4   0x10b1697a8 WebCore::RenderVTTCue::repositionCueSnapToLinesSet()
5   0x10b169730 WebCore::RenderVTTCue::layout()
6   0x10a1e9714 WebCore::RenderElement::layoutIfNeeded()
7   0x10af18438 WebCore::RenderBlock::layoutPositionedObject(WebCore::RenderBox&, bool, bool)
8   0x10af16fa8 WebCore::RenderBlock::layoutPositionedObjects(bool, bool)
9   0x10af16b2c WebCore::RenderBlock::simplifiedLayout()
10  0x10af31288 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
11  0x10af15164 WebCore::RenderBlock::layout()
12  0x10a1e9714 WebCore::RenderElement::layoutIfNeeded()
13  0x10af18438 WebCore::RenderBlock::layoutPositionedObject(WebCore::RenderBox&, bool, bool)
14  0x10af16fa8 WebCore::RenderBlock::layoutPositionedObjects(bool, bool)
15  0x10af3195c WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
16  0x10af15164 WebCore::RenderBlock::layout()
17  0x10b025870 WebCore::RenderImage::layoutShadowContent(WebCore::LayoutSize const&)
18  0x10b025450 WebCore::RenderImage::layout()
19  0x10b0ce5d8 WebCore::RenderMedia::layout()
20  0x10b16bd80 WebCore::RenderVideo::layout()
21  0x10a1e9714 WebCore::RenderElement::layoutIfNeeded()
22  0x10af36378 WebCore::RenderBlockFlow::layoutModernLines(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
23  0x10af33d70 WebCore::RenderBlockFlow::layoutInlineChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
24  0x10af322b8 WebCore::RenderBlockFlow::layoutInFlowChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
25  0x10af314b0 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
26  0x10af15164 WebCore::RenderBlock::layout()
27  0x10af34e90 WebCore::RenderBlockFlow::layoutBlockChild(WebCore::RenderBox&, WebCore::RenderBlockFlow::MarginInfo&, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
28  0x10af340d0 WebCore::RenderBlockFlow::layoutBlockChildren(bool, WebCore::LayoutUnit&)
29  0x10af322f4 WebCore::RenderBlockFlow::layoutInFlowChildren(bool, WebCore::LayoutUnit&, WebCore::LayoutUnit&, WebCore::LayoutUnit&)
30  0x10af314b0 WebCore::RenderBlockFlow::layoutBlock(bool, WebCore::LayoutUnit)
31  0x10af15164 WebCore::RenderBlock::layout()
com.apple.WebKit.WebContent.Development terminated (pid 38179) for reason: crash
LEAK: 1 WebPageProxy

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