linux-kernel - Re: [RFC PATCH v2 1/2] mm/userfaultfd: fix memory corruption due to writeprotect

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Message-ID: <20210105081325.GD3040@hirez.programming.kicks-ass.net>
Date:   Tue, 5 Jan 2021 09:13:25 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Andrea Arcangeli <aarcange@...hat.com>
Cc:     Nadav Amit <nadav.amit@...il.com>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org, Nadav Amit <namit@...are.com>,
        Yu Zhao <yuzhao@...gle.com>, Andy Lutomirski <luto@...nel.org>,
        Peter Xu <peterx@...hat.com>,
        Pavel Emelyanov <xemul@...nvz.org>,
        Mike Kravetz <mike.kravetz@...cle.com>,
        Mike Rapoport <rppt@...ux.vnet.ibm.com>,
        Minchan Kim <minchan@...nel.org>,
        Will Deacon <will@...nel.org>, Mel Gorman <mgorman@...e.de>
Subject: Re: [RFC PATCH v2 1/2] mm/userfaultfd: fix memory corruption due to
 writeprotect

On Mon, Jan 04, 2021 at 02:24:38PM -0500, Andrea Arcangeli wrote:
> The problematic one not pictured is the one of the wrprotect that has
> to be running in another CPU which is also isn't picture above. More
> accurate traces are posted later in the thread.

What thread? I don't seem to have discovered it yet, and the cover
letter from Nadav doesn't seem to have a msgid linking it either.