Feeds import infinite batch process

When importing nodes using the Feeds module, the Feeds batch process hangs and is unable to be stopped.

The Feeds file upload directory is set to use s3 (s3://feeds).

It seems like the issue comes from the stream_read function.

For large imports where the file size is greater than $count = 8192 there is no problem.
For small imports where the file size is less than $count = 8192 the batch process hangs and never finishes.

Feeds 7.x-2.0-alpha9.