[Webkit-unassigned] [Bug 211923] New: [ Mac wk1 Debug ] imported/w3c/web-platform-tests/fetch/api/basic/stream-safe-creation.any.html is flaky crashing with alerts - WTFCrashWithInfo - SC::JSObject::get(JSC::JSGlobalObject*, JSC::PropertyName)

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=211923

            Bug ID: 211923
           Summary: [ Mac wk1 Debug ]
                    imported/w3c/web-platform-tests/fetch/api/basic/stream
                    -safe-creation.any.html  is flaky crashing with alerts
                    - WTFCrashWithInfo -
                    SC::JSObject::get(JSC::JSGlobalObject*,
                    JSC::PropertyName)
           Product: WebKit
           Version: WebKit Nightly Build
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Platform
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: Lawrence.j at apple.com

Created attachment 399411

  --> https://bugs.webkit.org/attachment.cgi?id=399411&action=review

stream-safe-creation.any-crash-log

imported/w3c/web-platform-tests/fetch/api/basic/stream-safe-creation.any.html 

Description:
This test is flaky crashing on Mac wk1 Debug. This test appears to be flaky crashing throughout the visual history, the earliest crash that I see is on 11/05/2019.

History:
https://results.webkit.org/?suite=layout-tests&test=imported%2Fw3c%2Fweb-platform-tests%2Ffetch%2Fapi%2Fbasic%2Fstream-safe-creation.any.html&platform=mac&style=debug&flavor=wk1&limit=50000

Crash log: 
Thread 33 Crashed:: WebCore: Worker
0   com.apple.JavaScriptCore            0x00000001034e8070 WTFCrash + 16 (Assertions.cpp:303)
1   com.apple.WebCore                   0x000000011a759cbb WTFCrashWithInfo(int, char const*, char const*, int) + 27
2   com.apple.WebCore                   0x000000011aa7cb16 JSC::JSObject::get(JSC::JSGlobalObject*, JSC::PropertyName) const + 342 (JSObject.h:1493)
3   com.apple.WebCore                   0x000000011cc69e4c WebCore::ReadableStreamDefaultController::invoke(JSC::JSGlobalObject&, JSC::JSObject&, char const*, JSC::JSValue) + 252 (ReadableStreamDefaultController.cpp:56)
4   com.apple.WebCore                   0x000000011c265dc4 WebCore::ReadableStreamDefaultController::error(JSC::JSGlobalObject&, JSC::JSValue) + 68 (ReadableStreamDefaultController.h:57)
5   com.apple.WebCore                   0x000000011c263a1d WebCore::ReadableStreamDefaultController::error(WebCore::Exception const&) + 125 (ReadableStreamDefaultController.h:109)
6   com.apple.WebCore                   0x000000011c25e82c WebCore::FetchBodySource::error(WebCore::Exception const&) + 44 (FetchBodySource.cpp:94)
7   com.apple.WebCore                   0x000000011c28a6c0 WebCore::FetchResponse::BodyLoader::didFail(WebCore::ResourceError const&) + 736 (FetchResponse.cpp:306)
8   com.apple.WebCore                   0x000000011c2859cd WebCore::FetchLoader::didFail(WebCore::ResourceError const&) + 45 (FetchLoader.cpp:167)
9   com.apple.WebCore                   0x000000011dde067c WebCore::ThreadableLoaderClientWrapper::didFail(WebCore::ResourceError const&) + 60 (ThreadableLoaderClientWrapper.h:87)
10  com.apple.WebCore                   0x000000011dddfaef WebCore::WorkerThreadableLoader::MainThreadBridge::cancel() + 191 (WorkerThreadableLoader.cpp:182)
11  com.apple.WebCore                   0x000000011dddfa29 WebCore::WorkerThreadableLoader::cancel() + 25 (WorkerThreadableLoader.cpp:86)
12  com.apple.WebCore                   0x000000011c2857b9 WebCore::FetchLoader::stop() + 105 (FetchLoader.cpp:135)
13  com.apple.WebCore                   0x000000011c28b2c0 WebCore::FetchResponse::BodyLoader::stop() + 96 (FetchResponse.cpp:400)
14  com.apple.WebCore                   0x000000011c28b20c WebCore::FetchResponse::BodyLoader::didReceiveData(char const*, unsigned long) + 652 (FetchResponse.cpp:378)
15  com.apple.WebCore                   0x000000011c285947 WebCore::FetchLoader::didReceiveData(char const*, int) + 71 (FetchLoader.cpp:154)
16  com.apple.WebCore                   0x000000011de009d6 WebCore::ThreadableLoaderClientWrapper::didReceiveData(char const*, int) + 70 (ThreadableLoaderClientWrapper.h:73)
17  com.apple.WebCore                   0x000000011de00934 WebCore::WorkerThreadableLoader::MainThreadBridge::didReceiveData(char const*, int)::$_13::operator()(WebCore::ScriptExecutionContext&) + 180 (WorkerThreadableLoader.cpp:215)

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