[Webkit-unassigned] [Bug 214572] New: REGRESSION (r264242): [ macOS ] imported/w3c/web-platform-tests/wasm/jsapi/constructor/instantiate.any.html is a flaky crash

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=214572

            Bug ID: 214572
           Summary: REGRESSION (r264242): [ macOS ]
                    imported/w3c/web-platform-tests/wasm/jsapi/constructor
                    /instantiate.any.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:
imported/w3c/web-platform-tests/wasm/jsapi/constructor/instantiate.any.html
This has been a flaky crash.  This has appeared on Catalina WK2 debug once on 07/19/20.  Then appears on Catalina rWK1 release starting 07/14/20 crashing two days consecutively.  Another instance appears as a flaky crash on Mojave WK1 debug and release for 3 days in a row starting 07/15/20.

I can reproduce this for r264242, but not for r264241.

REPRODUCTION STEPS
run-webkit-tests --iterations 500 --exit-after-n-failures 3 --exit-after-n-crashes-or-timeouts 1 --debug-rwt-logging --no-retry --force --no-build -f --root imported/w3c/web-platform-tests/wasm/jsapi/constructor/instantiate.any.html

History:
https://results.webkit.org/?limit=50000&suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Fwasm%2Fjsapi%2Fconstructor%2Finstantiate.any.html&platform=mac

Crash Log:
Thread 31 Crashed:: Wasm Worklist Helper Thread
0   libobjc.A.dylib                     0x00007fff5cdc039d objc_msgSend + 29
1   com.apple.CoreFoundation            0x00007fff325744a9 CFEqual + 621
2   com.apple.CoreFoundation            0x00007fff32570215 CFBasicHashAddValue + 1205
3   com.apple.CoreFoundation            0x00007fff325a2f6d CFRunLoopAddTimer + 477
4   com.apple.JavaScriptCore            0x000000010bee42d8 WTF::RunLoop::TimerBase::start(WTF::Seconds, bool) + 200
5   com.apple.JavaScriptCore            0x000000010cc50c67 JSC::JSRunLoopTimer::Manager::scheduleTimer(JSC::JSRunLoopTimer&, WTF::Seconds) + 695

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