linux-kernel - Re: [PATCH 0/3] mainline and mmotm compaction fixes

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Message-ID: <20160425143413.GJ23933@dhcp22.suse.cz>
Date:	Mon, 25 Apr 2016 16:34:13 +0200
From:	Michal Hocko <mhocko@...nel.org>
To:	Vlastimil Babka <vbabka@...e.cz>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Joonsoo Kim <iamjoonsoo.kim@....com>,
	Hugh Dickins <hughd@...gle.com>, Rik van Riel <riel@...hat.com>
Subject: Re: [PATCH 0/3] mainline and mmotm compaction fixes

On Mon 25-04-16 15:34:26, Vlastimil Babka wrote:
[...]
> > 1. Fix crash in release_pages() from compact_zone() from kcompactd_do_work():
> >     kcompactd needs to INIT_LIST_HEAD on the new freepages_held list.
> 
> This one should be addressed by dropping the following from mmotm from now:
> 
> mm-compaction-direct-freepage-allocation-for-async-direct-compaction.patch

I can confirm that this has healed
[  481.380167] BUG: unable to handle kernel NULL pointer dereference at           (null)
[  481.382594] IP: [<ffffffff81134dc7>] release_freepages+0x1c/0x7d

I was hitting today during testing something unrelated.
-- 
Michal Hocko
SUSE Labs