251463 2023-01-31 15:22:42 -0800 Error on piped ReadableStream leads to Unhandled Promise Rejection 2023-03-27 00:25:24 -0700 1 1 1 Unclassified WebKit JavaScriptCore Safari 16 All All RESOLVED FIXED InRadar P2 Normal --- 1 hazae41 youennf webkit-bug-importer youennf oldest_to_newest 1929890 0 hazae41 2023-01-31 15:22:42 -0800 Hey, the following code leads to an Unhandled Promise Rejection on some websites: ``` new ReadableStream({ start: c => c.error("error") }).pipeTo(new WritableStream()).catch(() => {}) ``` It also happens when calling controller.error after the pipe: ``` new ReadableStream({ start: c => window.c = c }).pipeTo(new WritableStream()).catch(() => {}) c.error("error") ``` Just run it in Safari console on latest macOS (Ventura 13.2) and latest iOS (16.0) Websites where it happens: - example.com - bugs.webkit.org - github.com - facebook.com - amazon.com - blankwebsite.com Websites where it doesn't happen: - google.com 1931861 1 webkit-bug-importer 2023-02-07 15:23:16 -0800 <rdar://problem/105149496> 1943369 2 youennf 2023-03-23 08:15:47 -0700 Pull request: https://github.com/WebKit/WebKit/pull/11864 1944131 3 ews-feeder 2023-03-27 00:25:22 -0700 Committed 262137@main (3a75b5d2de94): <https://commits.webkit.org/262137@main> Reviewed commits have been landed. Closing PR #11864 and removing active labels.