[Webkit-unassigned] [Bug 217761] New: REGRESSION (r267662): [ Mojave+ debug wk1 ] webgl/2.0.0/conformance/extensions/webgl-compressed-texture-s3tc-srgb.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=217761

            Bug ID: 217761
           Summary: REGRESSION (r267662): [ Mojave+ debug wk1 ]
                    webgl/2.0.0/conformance/extensions/webgl-compressed-te
                    xture-s3tc-srgb.html is a flaky crash
           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

Description:
webgl/2.0.0/conformance/extensions/webgl-compressed-texture-s3tc-srgb.html

The first crash that I see this on the dashboard was 08/31/20 at r266366 and continued to flaky crash until 09/04/20 at r266624 where it began passing consistently.  Then at 09/07/20 at r266714 the flaky crash began again and ended 09/09/20 at r266799.  There is another period of consistent passing from 09/09/20 until 10/06/20 at r268052 where the flaky crash begins again until present.

I can reproduce this on r267662, but unable to reproduce on 267661. Commit r267662 has to do with updating the names everywhere and URLs in IDLAttributes.json, which could have introduced the flaky crash.  The change was introduced here https://trac.webkit.org/changeset/266662/webkit.


REPRODUCTION STEPS
Command: 
run-webkit-tests --exit-after-n-failures 1 --exit-after-n-crashes-or-timeouts 1 --iterations 50 --no-retry --force --no-build -f --debug -1 webgl/2.0.0/conformance/extensions/webgl-compressed-texture-s3tc-srgb.html

Result: 
Regressions: Unexpected crashes (1)
  webgl/2.0.0/conformance/extensions/webgl-compressed-texture-s3tc-srgb.html [ Crash ]

History:
https://results.webkit.org/?suite=layout-tests&test=webgl%2F2.0.0%2Fconformance%2Fextensions%2Fwebgl-compressed-texture-s3tc-srgb.html&platform=mac&style=debug&flavor=wk1&limit=50000

Crash Log:
Application Specific Information:
CRASHING TEST: webgl/2.0.0/conformance/extensions/webgl-compressed-texture-s3tc-srgb.html

Thread 0 Crashed:: Dispatch queue: com.apple.main-thread
0   com.apple.JavaScriptCore            0x00000001105ac4fe WTFCrash + 14 (Assertions.cpp:295)
1   com.apple.WebCore                   0x000000012ad8ea6b WTFCrashWithInfo(int, char const*, char const*, int) + 27
2   com.apple.WebCore                   0x000000012eb373f9 WebCore::FrameView::paintContents(WebCore::GraphicsContext&, WebCore::IntRect const&, WebCore::Widget::SecurityOriginPaintPolicy, WebCore::EventRegionContext*) + 697 (FrameView.cpp:4292)
3   com.apple.WebKitLegacy              0x000000011c5f03e9 -[WebFrame(WebInternal) _drawRect:contentsOnly:] + 1417 (WebFrame.mm:657)
4   com.apple.WebKitLegacy              0x000000011c614ff6 -[WebHTMLView drawSingleRect:] + 774 (WebHTMLView.mm:3883)
5   com.apple.WebKitLegacy              0x000000011c615711 -[WebHTMLView drawRect:] + 625 (WebHTMLView.mm:3954)

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