linux-kernel - Re: mm allocation failure and hang when running xfstests generic/269 on xfs

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Date:   Thu, 2 Mar 2017 13:19:00 +0800
From:   Xiong Zhou <xzhou@...hat.com>
To:     Christoph Hellwig <hch@...radead.org>, mhocko@...e.com
Cc:     Xiong Zhou <xzhou@...hat.com>, linux-xfs@...r.kernel.org,
        linux-mm@...ck.org, linux-kernel@...r.kernel.org,
        linux-fsdevel@...r.kernel.org
Subject: Re: mm allocation failure and hang when running xfstests generic/269
 on xfs

On Wed, Mar 01, 2017 at 04:37:31PM -0800, Christoph Hellwig wrote:
> On Wed, Mar 01, 2017 at 12:46:34PM +0800, Xiong Zhou wrote:
> > Hi,
> > 
> > It's reproduciable, not everytime though. Ext4 works fine.
> 
> On ext4 fsstress won't run bulkstat because it doesn't exist.  Either
> way this smells like a MM issue to me as there were not XFS changes
> in that area recently.

Yap.

First bad commit:

commit 5d17a73a2ebeb8d1c6924b91e53ab2650fe86ffb
Author: Michal Hocko <mhocko@...e.com>
Date:   Fri Feb 24 14:58:53 2017 -0800

    vmalloc: back off when the current task is killed

Reverting this commit on top of
  e5d56ef Merge tag 'watchdog-for-linus-v4.11'
survives the tests.