linux-kernel - Re: mm, vmstat: kernel BUG at mm/vmstat.c:1408!

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Message-ID: <20160120151007.GG14187@dhcp22.suse.cz>
Date:	Wed, 20 Jan 2016 16:10:08 +0100
From:	Michal Hocko <mhocko@...nel.org>
To:	Sasha Levin <sasha.levin@...cle.com>
Cc:	Christoph Lameter <cl@...two.org>,
	LKML <linux-kernel@...r.kernel.org>,
	"linux-mm@...ck.org" <linux-mm@...ck.org>,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: mm, vmstat: kernel BUG at mm/vmstat.c:1408!

On Wed 20-01-16 09:56:26, Sasha Levin wrote:
> On 01/20/2016 09:37 AM, Michal Hocko wrote:
> > I am just reading through this old discussion again because "vmstat:
> > make vmstat_updater deferrable again and shut down on idle" which seems
> > to be the culprit AFAIU has been merged as 0eb77e988032 and I do not see
> > any follow up fix merged to linus tree
> 
> So this isn't an "old" discussion - the bug is very much there and I can
> hit it easily. As a workaround I've "disabled" vmstat.

Well the report is since 18th Dec which is over month old. Should we
revert 0eb77e988032 as a pre caution and make sure this is done properly
in -mm tree. AFAIR none of the proposed fix worked without other
fallouts?
-- 
Michal Hocko
SUSE Labs