linux-kernel - Re: [PATCH v8 14/21] mm/mmap: Avoid zeroing vma tree in mmap

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Message-ID: <cb24ddf8-2299-4b65-af04-e8a1ecc180e2@lucifer.local>
Date: Tue, 1 Oct 2024 10:20:02 +0100
From: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
To: Bert Karwatzki <spasswolf@....de>
Cc: "Liam R . Howlett" <Liam.Howlett@...cle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 14/21] mm/mmap: Avoid zeroing vma tree in mmap_region()

On Tue, Oct 01, 2024 at 11:10:55AM GMT, Bert Karwatzki wrote:
> It seems that the maple tree broke down, here's the result of the run with
> CONFIG_DEBUG_MAPLETREE=y in all it's g(l)ory. (Here I didn't need to try to
> kill
> the processes to get an error and soon after the error occured everything
> stopped working so I had to reboot via powerbutton.)
>
> Bert Karwatzki

Yike thanks very much!

If it's at all possible for you to confirm this happens on Linus's tree
just to be super super sure (again I totally expect this) then that'd be
amazing.

I ask because we have another thread which bisected a problem to this
commit which we didn't think was the cause and seemed actually to be the
result of something else fiddling around with things it shouldn't so just
want to entirely rule that out (a fix was applied to Linus's tree for
that).

[snip for snaity]