LazyStream raises SuspiciousOperation in newforms-admin with upload object edited inline

[bryan]

I have a model called Listing, and a model called Photo containing an ImageField and a ForeignKey to Listing.

Listing is managed using newforms-admin with Photo edited inline, extra=3.

In this case, LazyStream in multipartparser.py raises SuspiciousOperation when saving a Listing in newforms-admin, whenever there are more than a couple Photos associated with a Listing. The exception gets raised regardless of whether new files are being uploaded.

The exception message is: The multipart parser got stuck, which shouldn't happen with normal uploaded files. Check for malicious upload activity; if there is none, report this to the Django developers.

[anonymous]

This looks like a duplicate of #7635.

[bryan]

Thanks for pointing that out. Looks like #7635 is sufficiently similar.