[Webkit-unassigned] [Bug 201871] New: AbortSignal does not always emit the abort signal

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=201871

            Bug ID: 201871
           Summary: AbortSignal does not always emit the abort signal
           Product: WebKit
           Version: Safari 12
          Hardware: Macintosh
                OS: macOS 10.14
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: New Bugs
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: jkieboom at esri.com

This problem occurs in a large code base and I am having trouble setting up a simple reproducible test case outside of our application. It looks like when using an AbortController, calling abort on it may in certain circumstances not emit the abort event on the corresponding signal. It feels like this is problem of premature garbage collection because if I plug the corresponding signal on another object that is kept alive, I do receive the abort event correctly. In addition, the problem in our application does not appear if I use an AbortController/AbortSignal shim (further indicating that this is a problem in the native implementation somehow). I'll try to come up with an isolated test case, but I'm having a hard time doing so.

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