Comment 46 for bug 811604

Same issue here. Problem appeared after upgrading to 20.10 (a couple of weeks ago). Didn't realize about it until I couldn't initiate X session (there was no space in root folder for the temporary files and got an error message).

Deleting the file solves the "main issue" and I'm able to log in again but the file keeps growing a couple of Gb every day and it has to be deleted from time to time (which is not difficult but definitely is quite annoying).