Bug 272600 – NotReadableError: The I/O read operation failed for large files of size 4G+

• Status: RESOLVED
• Resolution: FIXED
• Component: WebCore Misc.

[Vojtěch Moravec]

Created attachment 470903 [details]
Small repro for bug.

Hello,

I have came accross bug regarding the ReadableStream::getReader() [https://developer.mozilla.org/en-US/docs/Web/API/ReadableStream/getReader] method.

This method fails for large files, of size 4G+, with `NotReadableError: The I/O read operation failed`.

I have tested this with *real* files and also some generated ones. Generated like: `dd if=/dev/zero of=test.dat bs=1G count=3`

Files of sizes 1G, 2G, 3G were fine, but from 4G, the error would occur. This makes upload of such files, using this API not working.

Also we can note, that this is not problem with the file itself, because *workaround* using `slice`, eg. `await file.slice(0, 65_536).stream().getReader().read();` is able to read the first Chunk of the file.

Small repro is attached.

```
const fileStream = file.stream();
const fileStreamReader = fileStream.getReader(); <-- NotReadableError will occur here
const {done, value} = await fileStreamReader.read() <-- this won't work, stream is closed because of the NotReadableError

console.log(done);
console.log(value);
```

[Alexey Proskuryakov]

Surprisingly, I could not find any existing bug tracking this, even though this was something we discussed in conjunction with bug 145083 before.

It would be good to know if common user scenarios were still affected (such as uploading to YouTube or to Google Drive).

[Vojtěch Moravec]

(In reply to Alexey Proskuryakov from comment #1)
> Surprisingly, I could not find any existing bug tracking this, even though
> this was something we discussed in conjunction with bug 145083 before.
> 
> It would be good to know if common user scenarios were still affected (such
> as uploading to YouTube or to Google Drive).

Yeah,
Uploading with mux's UpChunk to Google storage doesn't work.

I have already filled issue with them.
https://github.com/muxinc/upchunk/issues/134

[Radar WebKit Bug Importer]

<rdar://problem/126863800>

[youenn fablet]

Repro is not working for me since it is using byob.
https://jsfiddle.net/amrktnh6/ reproes the issue.

[youenn fablet]

Pull request: https://github.com/WebKit/WebKit/pull/27875

[EWS]

Committed 278457@main (0608392ae72e): <https://commits.webkit.org/278457@main>

Reviewed commits have been landed. Closing PR #27875 and removing active labels.