[Webkit-unassigned] [Bug 251463] New: Error on piped ReadableStream leads to Unhandled Promise Rejection

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=251463

            Bug ID: 251463
           Summary: Error on piped ReadableStream leads to Unhandled
                    Promise Rejection
           Product: WebKit
           Version: Safari 16
          Hardware: All
                OS: All
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: hazae41 at proton.me

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

-- 
You are receiving this mail because:
You are the assignee for the bug.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.webkit.org/pipermail/webkit-unassigned/attachments/20230131/a9ce7148/attachment.htm>