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[24.6.216.183]) by smtp.gmail.com with ESMTPSA id 197sm63832387pgg.43.2021.01.05.00.52.49 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 05 Jan 2021 00:52:50 -0800 (PST) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 13.4 \(3608.120.23.2.4\)) Subject: Re: [RFC PATCH v2 1/2] mm/userfaultfd: fix memory corruption due to writeprotect From: Nadav Amit In-Reply-To: <20210105081325.GD3040@hirez.programming.kicks-ass.net> Date: Tue, 5 Jan 2021 00:52:48 -0800 Cc: Andrea Arcangeli , linux-mm , lkml , Yu Zhao , Andy Lutomirski , Peter Xu , Pavel Emelyanov , Mike Kravetz , Mike Rapoport , Minchan Kim , Will Deacon , Mel Gorman Content-Transfer-Encoding: 7bit Message-Id: References: <20201225092529.3228466-1-namit@vmware.com> <20201225092529.3228466-2-namit@vmware.com> <20210104122227.GL3021@hirez.programming.kicks-ass.net> <20210105081325.GD3040@hirez.programming.kicks-ass.net> To: Peter Zijlstra X-Mailer: Apple Mail (2.3608.120.23.2.4) X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: > On Jan 5, 2021, at 12:13 AM, Peter Zijlstra wrote: > > 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. Sorry for that: https://lore.kernel.org/lkml/X+K7JMrTEC9SpVIB@google.com/T/