201871 2019-09-17 06:32:03 -0700 AbortSignal does not always emit the abort signal 2019-10-04 09:31:30 -0700 1 1 1 Unclassified WebKit DOM Safari 12 Mac macOS 10.14 RESOLVED FIXED InRadar P2 Normal --- 0 jkieboom youennf ap cdumez commit-queue dbates dpaddock esprehn+autocc ews-watchlist kangil.han kondapallykalyan sam webkit-bug-importer youennf oldest_to_newest 1571515 0 jkieboom 2019-09-17 06:32:03 -0700 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. 1571516 1 378960 jkieboom 2019-09-17 06:42:26 -0700 Created attachment 378960 Abort signal appears evicted under GC pressure I'm not confident this is the smallest repro case, and it doesn't appear to _always_ reproduce the problem. For me this seems to trigger the issue one out of three times or so. 1571642 2 ap 2019-09-17 13:09:16 -0700 This seems like it's most likely an issue in AbortController, which is not part of WebKit. I think that your hunch is correct, and this is related to garbage collection. So perhaps AbortController needs to protect its properties from collection. Please feel free to re-open if you find evidence of this being a WebKit bug. We'll almost certainly need a reproducible test case to work on this. 1571658 3 dpaddock 2019-09-17 13:30:10 -0700 Can this be reopened with the Component set to WebCore since the code is at: https://trac.webkit.org/browser/webkit/trunk/Source/WebCore/dom/AbortController.cpp 1571661 4 ap 2019-09-17 13:37:25 -0700 Apologies, turns out that I didn't know what I was taking about. 1571662 5 webkit-bug-importer 2019-09-17 13:37:42 -0700 <rdar://problem/55451712> 1576845 6 380219 youennf 2019-10-04 07:26:11 -0700 Created attachment 380219 Patch 1576885 7 380219 commit-queue 2019-10-04 09:31:28 -0700 Comment on attachment 380219 Patch Clearing flags on attachment: 380219 Committed r250727: <https://trac.webkit.org/changeset/250727> 1576886 8 commit-queue 2019-10-04 09:31:30 -0700 All reviewed patches have been landed. Closing bug. 378960 2019-09-17 06:42:26 -0700 2019-09-17 06:42:26 -0700 Abort signal appears evicted under GC pressure testcase.js text/javascript 649 jkieboom ZnVuY3Rpb24gcnVuKCkgewogIGxldCBvYmogPSB7CiAgICBhYm9ydENvbnRyb2xsZXI6IG5ldyBB Ym9ydENvbnRyb2xsZXIoKQogIH07CgogIGNvbnN0IGNvbnRyb2xsZXIgPSBvYmouYWJvcnRDb250 cm9sbGVyOwoKICBzZXRUaW1lb3V0KGZ1bmN0aW9uKCkgewogICAgY29udHJvbGxlci5hYm9ydCgp OwogIH0sIDMwMDApOwoKICByZXR1cm4gY29udHJvbGxlci5zaWduYWw7Cn0KCmZ1bmN0aW9uIGhh bmRsZShzaWduYWwpIHsKICBzZXRUaW1lb3V0KGZ1bmN0aW9uKCkgewogICAgc2lnbmFsLmFkZEV2 ZW50TGlzdGVuZXIoImFib3J0IiwgZnVuY3Rpb24oKSB7CiAgICAgIGNvbnNvbGUubG9nKCJhYm9y dGVkIik7CiAgICB9KTsKICB9LCAxMDAwKTsKfQoKZnVuY3Rpb24gZG9pdCgpIHsKICBjb25zdCBz aWduYWwgPSBydW4oKTsKICBoYW5kbGUoc2lnbmFsKTsKfQoKZG9pdCgpOwoKd2luZG93WyJhcnIi XSA9IFtdOwoKZm9yIChsZXQgaSA9IDA7IGkgPCAxMDAwMDsgaSsrKSB7CiAgY29uc3QgYXIgPSBu ZXcgQXJyYXkoMTAwMDApOwoKICBmb3IgKGxldCBqID0gMDsgaiA8IDEwMDAwOyBqKyspIHsKICAg 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