linux-kernel - Re: [PATCH] mm, compaction: fix fast_isolate

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Message-ID: <20221107154350.34brdl3ms2ve5wud@techsingularity.net>
Date:   Mon, 7 Nov 2022 15:43:50 +0000
From:   Mel Gorman <mgorman@...hsingularity.net>
To:     "Akira Naribayashi (Fujitsu)" <a.naribayashi@...itsu.com>
Cc:     "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "vbabka@...e.cz" <vbabka@...e.cz>,
        "rientjes@...gle.com" <rientjes@...gle.com>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH] mm, compaction: fix fast_isolate_around() to stay within
 boundaries

On Mon, Nov 07, 2022 at 12:32:34PM +0000, Akira Naribayashi (Fujitsu) wrote:
> > Under what circumstances will this panic occur?  I assume those
> > circumstnces are pretty rare, give that 6e2b7044c1992 was nearly two
> > years ago.
> > 
> > Did you consider the desirability of backporting this fix into earlier
> > kernels?
> 
> 
> Panic can occur on systems with multiple zones in a single pageblock.
> 

Please provide an example of the panic and the zoneinfo.

> The reason it is rare is that it only happens in special configurations.

How is this special configuration created?

-- 
Mel Gorman
SUSE Labs