Error "unsupported bset version"

Error "unsupported bset version"

[Tobias Reinhard]

Hi all,

I'm running bcache to speed up my 4 TB HDD with a 64 GB partition on my 
SSD. After a reboot bcache didn't start automatically. So I stopped 
bcache, unloaded the module, reloaded it and tried to register the SSD 
and HDD again.

Registering the SSD gave me this error:
error on f1e69e99-940d-447a-900e-4956bd607933: unsupported bset version 
at bucket 108098, block 0, 855650560 keys, disabling caching

The bcache was running in writeback mode but I think it was almost clean 
so I forced the device to go online and made an fsck. Everything looks 
ok, so no data loss. But surely this should not happen, right? Is there 
any way to check why? (I made an image of the cache device)

Kernel is  3.10.7; setup with "make-bcache -C -w 512 /dev/sdb2" and 
"make-bcache -B -w 512 /dev/sda2 --data-offset=2048"


Regards

Tobias

Re: Error "unsupported bset version"

[Kent Overstreet]

On Sat, Aug 24, 2013 at 01:47:46PM +0200, Tobias Reinhard wrote:
> Hi all,
> 
> I'm running bcache to speed up my 4 TB HDD with a 64 GB partition on
> my SSD. After a reboot bcache didn't start automatically. So I
> stopped bcache, unloaded the module, reloaded it and tried to
> register the SSD and HDD again.
> 
> Registering the SSD gave me this error:
> error on f1e69e99-940d-447a-900e-4956bd607933: unsupported bset
> version at bucket 108098, block 0, 855650560 keys, disabling caching
> 
> The bcache was running in writeback mode but I think it was almost
> clean so I forced the device to go online and made an fsck.
> Everything looks ok, so no data loss. But surely this should not
> happen, right? Is there any way to check why? (I made an image of
> the cache device)

I think this was the result of a bug for which I accidentally didn't
mark the fix for stable - the fix was in 3.11

I just sent out a pull request to get it into 3.10, and in the meantime
I have a branch with all the relevant fixes on top of 3.10:

git://evilpiepirate.org/~kent/linux-bcache.git bcache-3.10-stable