On Wed, 21 Jun 2017, Nix wrote:

On 20 Jun 2017, Eric Wheeler uttered the following:

quoted

On Mon, 5 Jun 2017, Igor Pavlenko wrote:

quoted

[   45.941155] bcache: register_bdev() registered backing device sda3
[   46.138238] bcache: error on 471776aa-1b34-4eff-ba7d-509a9554b43d:
inconsistent ptrs: mark = 3, level = 0, disabling caching

^^^

This is the reason, something was inconsistent enough that it couldn't 
continue.  

Kent, do you know what this means in detail, and can you guess what might 
have caused it?

I'm rather worried about this sort of thing, given that I got it after
my first cache population and less than a week using bcache in anger.

Do you have a difference between `blockdev --getpbsz /dev/cache` vs 
/dev/bdev (or whatever your devices are named) ?

The physical blocksize must be the same as the cachedev IIRC.  If 4k, use 
-w 4k in make-bcache.  There's a thread somewhere discussing those 
details.  


--
Eric Wheeler

The system in question is an oldie that restarts by mounting as much as
it can readonly and then doing a reboot (when bcache would routinely
whine about timeouts): the things it manages to remount readonly does
not usually include / is bcache usually unhappy about this sort of
thing? Would it prefer it if I was able to unmount it properly? If so,
it's time to upgrade that machine... it's only that I've had an oops
before now when stopping bcaches (early in test, not preserved because I
thought I'd made a mistake), so I thought it might be unhappy about
*that*, as well.

-- 
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