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

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Message-ID: <20170801175031.74llpntgz3qirv3s@codemonkey.org.uk>
Date:   Tue, 1 Aug 2017 13:50:31 -0400
From:   "davej@...emonkey.org.uk" <davej@...emonkey.org.uk>
To:     Linus Torvalds <torvalds@...ux-foundation.org>
Cc:     Trond Myklebust <trondmy@...marydata.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "bfields@...ldses.org" <bfields@...ldses.org>,
        "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>,
        "schumaker.anna@...il.com" <schumaker.anna@...il.com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
Subject: Re: [GIT PULL] Please pull NFS client changes for Linux 4.13

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*

	Dave