linux-kernel - Re: [PATCH stable-only] mm: fix classzone_idx underflow in shrink

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Message-ID: <20170704085537.GA20372@kroah.com>
Date:   Tue, 4 Jul 2017 10:55:37 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Vlastimil Babka <vbabka@...e.cz>
Cc:     stable <stable@...r.kernel.org>,
        Johannes Weiner <hannes@...xchg.org>,
        Minchan Kim <minchan@...nel.org>,
        Michal Hocko <mhocko@...nel.org>,
        linux-mm <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Mel Gorman <mgorman@...hsingularity.net>
Subject: Re: [PATCH stable-only] mm: fix classzone_idx underflow in
 shrink_zones()

On Tue, Jul 04, 2017 at 10:45:43AM +0200, Vlastimil Babka wrote:
> Hi,
> 
> I realize this is against the standard stable policy, but I see no other
> way, because the mainline accidental fix is part of 34+ patch reclaim
> rework, that would be absurd to try to backport into stable. The fix is
> a one-liner though.
> 
> The bug affects at least 4.4.y, and likely also older stable trees that
> backported commit 7bf52fb891b6, which itself was a fix for 3.19 commit
> 6b4f7799c6a5. You could revert the 7bf52fb891b6 backport, but then 32bit
> with highmem might suffer from OOM or thrashing.

I need a bunch of acks from developers in this area before I can take
this patch :)

thanks,

greg k-h