Re: [bcachefs][tier] INFO: task bch_tier_read:21414 blocked for more than 120 seconds.

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On Wed, Oct 12, 2016 at 01:07:46PM +0200, Marcin Mirosław wrote:
> W dniu 12.10.2016 o 03:26, Kent Overstreet pisze:
> Hi,
> [...]
> > You're not the only one who's seeing this, I've been chasing this bug for the
> > past several days...
> > 
> 
> Is something that can be done on my side to help with it?
> I can add information that tier0 device is a device with short time of
> writing requests - it's a HW controller with RAM. Second bling shot is
> that using btree-node=256k was problematic some time ago:
> http://www.spinics.net/lists/linux-bcache/msg04178.html , maybe this is
> somehow related to the btree-node size?

It turns out it's not a bcache bug - FUA is buggy...

If you want, you could confirm by changing journal_flushes_device() to always
return true - journal.h line 85.

Gonna try and figure out what the actual FUA bug is tomorrow...
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