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

[Jan Kara]

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@xxxxxxxx>
SUSE Labs, CR