Re: [GIT PULL] Please pull NFS client changes for Linux 4.13

From: davej@xxxxxxxxxxxxxxxxx
Date: Tue Aug 01 2017 - 13:50:41 EST

On Tue, Aug 01, 2017 at 10:20:31AM -0700, Linus Torvalds wrote:

> So I think the 'pathname' part may actually be entirely a red herring,
> and it's the underlying access itself that just picks up a random
> pointer from a stack that now contains something different. And KASAN
> didn't notice the stale stack access itself, because the stack slot is
> still valid - it's just no longer the original 'verifier' allocation.
> Or *something* like that.
> None of this looks even remotely new, though - the code seems to go
> back to 2009. Have you just changed what you're testing to trigger
> these things?

No idea why it only just showed up, but it isn't 100% reproducable
either. A month or so ago I did disable the V4 code on the server
completely (as I was using v3 everywhere else), so maybe I started hitting
a fallback path somewhere. *shrug*