I had this exact problem and it was also caused by the Redirection plugin. The problem also actually prevented me from removing the redirection record in Modified Posts. Trying to delete that record caused it to loop and fill the log full of hits to it.
I wish I could describe it better but I’m new to redirection. Absolute madness is the best I can come up with. Luckily I had just installed redirection and didn’t have a load of records in it. So I just disabled the plugin and reinstalled it.
Now it seems the plugin does not come with a record already in the Modified Posts group which caused this issue.