Subject: Re: mm, vmstat: kernel BUG at mm/vmstat.c:1408!
To: Christoph Lameter <cl@linux.com>
References: <5674A5C3.1050504@oracle.com>
 <alpine.DEB.2.20.1512210656120.7119@east.gentwo.org>
 <567860EB.4000103@oracle.com>
Cc: Michal Hocko <mhocko@suse.cz>, LKML <linux-kernel@vger.kernel.org>,
        "linux-mm@kvack.org" <linux-mm@kvack.org>
From: Sasha Levin <sasha.levin@oracle.com>
Message-ID: <56786A22.9030103@oracle.com>
Date: Mon, 21 Dec 2015 16:07:46 -0500
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On 12/21/2015 03:28 PM, Sasha Levin wrote:
> On 12/21/2015 08:08 AM, Christoph Lameter wrote:
>> > On Fri, 18 Dec 2015, Sasha Levin wrote:
>> > 
>>>> >> > [  531.164630] RIP vmstat_update (mm/vmstat.c:1408)
>> > Hmmm.. Yes we need to fold the diffs first before disabling the timer
>> > otherwise the shepherd task may intervene.
>> > 
>> > Does this patch fix it?
> It didn't. With the patch I'm still seeing:

I've also noticed a new warning from the workqueue code which my scripts
didn't pick up before:

[ 3462.380681] BUG: workqueue lockup - pool cpus=2 node=2 flags=0x4 nice=0 stuck for 54s!
[ 3462.522041] workqueue vmstat: flags=0xc
[ 3462.527795]   pwq 4: cpus=2 node=2 flags=0x0 nice=0 active=1/256
[ 3462.554836]     pending: vmstat_update


Thanks,
Sasha
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