linux-kernel - Re: ext4 corruption on alpha with 4.20.0-09062-gd8372ba8ce28

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Message-ID: <20190221132916.GA22886@quack2.suse.cz>
Date:   Thu, 21 Feb 2019 14:29:16 +0100
From:   Jan Kara <jack@...e.cz>
To:     Meelis Roos <mroos@...ux.ee>
Cc:     Jan Kara <jack@...e.cz>, Matthew Wilcox <willy@...radead.org>,
        "Theodore Y. Ts'o" <tytso@....edu>, linux-alpha@...r.kernel.org,
        LKML <linux-kernel@...r.kernel.org>, linux-block@...r.kernel.org,
        linux-mm@...ck.org
Subject: Re: ext4 corruption on alpha with 4.20.0-09062-gd8372ba8ce28

On Thu 21-02-19 01:23:50, Meelis Roos wrote:
> > > First, I found out that both the problematic alphas had memory compaction and
> > > page migration and bounce buffers turned on, and working alphas had them off.
> > > 
> > > Next, turing off these options makes the problematic alphas work.
> > 
> > OK, thanks for testing! Can you narrow down whether the problem is due to
> > CONFIG_BOUNCE or CONFIG_MIGRATION + CONFIG_COMPACTION? These are two
> > completely different things so knowing where to look will help. Thanks!
> 
> Tested both.
> 
> Just CONFIG_MIGRATION + CONFIG_COMPACTION breaks the alpha.
> Just CONFIG_BOUNCE has no effect in 5 tries.

OK, so page migration is problematic. Thanks for confirmation!

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR