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

Meelis Roos
2019-02-20T23:23:55Z

>> 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