Are you 100% sure that the proc folder is 50 gb in size? Can you post some screenshots? From what I understand, the proc folder is dynamic and goes up and down depending on what processes are running. It seems odd that there would be 50 gb of processes running on your device at any given time. Maybe some sort of memory leak?
Have you tried installing different versions of your OS? Can you flash a rom that is a different OS version than what you are currently using? And so now the problem persists, even when you go back to the original stock firmware you were running prior to installing a new rom?
Also, just to be double sure, are we talking about the Oneplus One (A1000) that you listed in your profile? I didn't see in this thread any mention of a device model.
I've tried looking around a bit but can't find any solutions (or even problems) with the proc folder. Some people complain that it is up to 300 mb or so, but that's a big jump to 50 gb. It just seems like a really odd problem, and makes me wonder if the problem could be something else??
Also, could you install this small app that was made by one of our moderators (
@scary alien), and copy/paste the results here?
Storage Truth