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A 5.7 install, on a content type (in this case, a blog post) with no form of access control installed.
Create the blog post. Hit submit. Click the edit tab on the newly created node. Edit the node. Hit submit. Get whitescreen, and eventually the error message that "Firefox has determined that the page is being redirected in a way that will never complete.
Then, on every page load, you see the repeated message in the attached screenshot.