linux-kernel - Re: [PATCH v3 2/2] mm/page_alloc: fix memmap_init

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Date:   Fri, 2 Mar 2018 16:40:52 -0800
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Daniel Vacek <neelx@...hat.com>
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Michal Hocko <mhocko@...e.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Mel Gorman <mgorman@...hsingularity.net>,
        Pavel Tatashin <pasha.tatashin@...cle.com>,
        Paul Burton <paul.burton@...tec.com>, stable@...r.kernel.org
Subject: Re: [PATCH v3 2/2] mm/page_alloc: fix memmap_init_zone pageblock
 alignment

On Sat,  3 Mar 2018 01:12:26 +0100 Daniel Vacek <neelx@...hat.com> wrote:

> Commit b92df1de5d28 ("mm: page_alloc: skip over regions of invalid pfns
> where possible") introduced a bug where move_freepages() triggers a
> VM_BUG_ON() on uninitialized page structure due to pageblock alignment.

b92df1de5d28 was merged a year ago.  Can you suggest why this hasn't
been reported before now?

This makes me wonder whether a -stable backport is really needed...