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Date:   Fri, 2 Mar 2018 16:40:52 -0800
From:   Andrew Morton <akpm@linux-foundation.org>
To:     Daniel Vacek <neelx@redhat.com>
Cc:     linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Michal Hocko <mhocko@suse.com>,
        Vlastimil Babka <vbabka@suse.cz>,
        Mel Gorman <mgorman@techsingularity.net>,
        Pavel Tatashin <pasha.tatashin@oracle.com>,
        Paul Burton <paul.burton@imgtec.com>, stable@vger.kernel.org
Subject: Re: [PATCH v3 2/2] mm/page_alloc: fix memmap_init_zone pageblock
 alignment
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On Sat,  3 Mar 2018 01:12:26 +0100 Daniel Vacek <neelx@redhat.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...