Re: Issue (as expected) when upgrading from 3.12 to 3.13.7

[Francis Moreau <francis.moro@gmail.com>]

On 04/03/2014 12:02 PM, Vivek Dasmohapatra wrote:
> On Sun, 30 Mar 2014, Francis Moreau wrote:
> 
> Hi Francis: A quick question for you if you have the time:
> How is the bcache constructed? ie which devices are in it?
> 

sure: I'm using bcache on a very basic setup: no MD or LVM involved.
/dev/sda4 (900Mo) is the backing device while /dev/sdb (120G) is the
cache device. On top of bcache0 I'm using ext4 and I'm using it as my
root device.

> I have had similar lockup problems when using partitions
> as backing, but not whole devices. That is to say:
> 
>     { ram0 : sdb1 }  often deadlocks for me (depending on the offset
>                      of the partition)
> 
>     { ram0 : sdb  }  always seems to work fine
> 
> Although in neither case am I able to tear down the device and
> flush it all to backing after heavy use: That always locks up
> for me. (Fortunately I'm making throwaway filesystems for a build
> daemon so that part I can live with).
> 

For now it doesn't endup to lock up (cross fingers). It only fills the
kernel logs, well I hope.

Thanks.