linux-kernel - Re: [PATCH] mm: page_alloc: validate buddy before check its migratetype.

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Message-ID: <CAHk-=whZ7d8Z4rv5oV9+FLEEk_1A1X=JsJaeAmFZzhDxLqDLFg@mail.gmail.com>
Date:   Wed, 30 Mar 2022 16:03:53 -0700
From:   Linus Torvalds <torvalds@...ux-foundation.org>
To:     Zi Yan <ziy@...dia.com>
Cc:     Steven Rostedt <rostedt@...dmis.org>,
        David Hildenbrand <david@...hat.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Mike Rapoport <rppt@...nel.org>,
        Oscar Salvador <osalvador@...e.de>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Linux-MM <linux-mm@...ck.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] mm: page_alloc: validate buddy before check its migratetype.

On Wed, Mar 30, 2022 at 3:12 PM Zi Yan <zi.yan@...t.com> wrote:
>
> Fixes: 1dd214b8f21c ("mm: page_alloc: avoid merging non-fallbackable pageblocks with others")

Oh, btw - should this perhaps be backported further back than that
alleged "fixes" commit?

It does look like maybe the problem potentially existed before too,
and was just much harder to trigger.

That said, google doesn't find any other reports that look like
Steven's oops, so maybe it really never happened and backporting isn't
called for.

Or possibly my google-fu is just bad.

                  Linus