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Date:   Wed, 20 Feb 2019 10:48:13 +0100
From:   Jan Kara <>
To:     Meelis Roos <>
Cc:     Matthew Wilcox <>, Jan Kara <>,
        "Theodore Y. Ts'o" <>,,
        LKML <>,,
Subject: Re: ext4 corruption on alpha with 4.20.0-09062-gd8372ba8ce28

On Wed 20-02-19 08:31:05, Meelis Roos wrote:
> > Could
> >
> > 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
completely different things so knowing where to look will help. Thanks!

Jan Kara <>

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