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

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Message-ID: <20190220094813.GA27474@quack2.suse.cz>
Date:   Wed, 20 Feb 2019 10:48:13 +0100
From:   Jan Kara <jack@...e.cz>
To:     Meelis Roos <mroos@...ux.ee>
Cc:     Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        "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 Wed 20-02-19 08:31:05, Meelis Roos wrote:
> > Could
> > https://lore.kernel.org/linux-mm/20190219123212.29838-1-larper@axis.com/T/#u
> > be relevant?
> 
> Tried it, still broken.

OK, I didn't put too much hope into this patch as you see filesystem
metadata corruption so icache/dcache coherency issues seemed unlikely.
Still good that you've tried so that we are sure.

> I wrote:
> 
> > But my kernel config had memory compaction (that turned on page migration) and
> > bounce buffers. I do not remember why I found them necessary but I will try
> > without them.
> 
> 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!

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