[Webkit-unassigned] [Bug 260742] New: REGRESSION (267279 at main): [ macOS Debug ] ASSERTION FAILED: WebCore::MediaSource::completeSeek()::SeeksCallbackAggregator::SeeksCallbackAggregator

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=260742

            Bug ID: 260742
           Summary: REGRESSION (267279 at main): [ macOS Debug ] ASSERTION
                    FAILED:
                    WebCore::MediaSource::completeSeek()::SeeksCallbackAgg
                    regator::SeeksCallbackAggregator
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: rackler at apple.com

Created attachment 467442

  --> https://bugs.webkit.org/attachment.cgi?id=467442&action=review

symbolicated-log

Description:
fast/canvas/webgl/texImage2D-mse-flipY-false.html
fast/canvas/webgl/texImage2D-mse-flipY-true.html

2 fast/canvas/webgl/texImage2D-mse-flipY are a consistent crash on macOS ToT and since 267279 at main.  
Commit <https://commits.webkit.org/267279@main> modified code for SeeksCallbackAggregator which is now causing the tests assertions on macOS debug.

This issue can be reproduced using command:
run-webkit-tests --debug --iterations=1   fast/canvas/webgl/texImage2D-mse-flipY-false.html

History:
https://results.webkit.org/?suite=layout-tests&suite=layout-tests&test=fast%2Fcanvas%2Fwebgl%2FtexImage2D-mse-flipY-false.html&test=fast%2Fcanvas%2Fwebgl%2FtexImage2D-mse-flipY-true.html&platform=mac&style=debug

Crash Log:
Thread 0 Crashed::   Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore                   0x1377de6e0 WTFCrash
1   com.apple.WebCore                          0x2840c7cd0 WTFCrashWithInfo(int, char const*, char const*, int)
2   com.apple.WebCore                          0x28277d334 WebCore::MediaSource::completeSeek()::SeeksCallbackAggregator::SeeksCallbackAggregator(WTF::MediaTime, WebCore::MediaSource&, WTF::CompletionHandler<void (WTF::MediaTime const&)>&&)
3   com.apple.WebCore                          0x28276d2e0 WebCore::MediaSource::completeSeek()::SeeksCallbackAggregator::SeeksCallbackAggregator(WTF::MediaTime, WebCore::MediaSource&, WTF::CompletionHandler<void (WTF::MediaTime const&)>&&)
4   com.apple.WebCore                          0x28276d144 WebCore::MediaSource::completeSeek()
5   com.apple.WebCore                          0x28276cd20 WebCore::MediaSource::seekToTarget(WebCore::SeekTarget const&, WTF::CompletionHandler<void (WTF::MediaTime const&)>&&)

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