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

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Message-ID: <2381c264-92f5-db43-b6a5-8e00bd881fef@linux.ee>
Date:   Thu, 21 Feb 2019 01:23:50 +0200
From:   Meelis Roos <mroos@...ux.ee>
To:     Jan Kara <jack@...e.cz>
Cc:     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

>> 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.

-- 
Meelis Roos