Re: 4.11.2: reshape raid5 -> raid6 atop bcache deadlocks at start on md_attr_store / raid5_make_request

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On 25 May 2017, NeilBrown spake thusly:

> On Wed, May 24 2017, Nix wrote:
>>
>> (I'm not sure what to do if it *works* -- how do I test any later
>> changes? I might reshape back to RAID-5 + spare again just so I can test
>> later stuff, but that would take ages: the array is over 14TiB...)
>
> If it works (which it did), then we'll have enough understanding that it
> should be easy to simulate the problem accurately in a VM.
> I don't think there is any need for you to experiment further on your
> data.

If you need me to, I can -- this machine isn't commissioned yet (though
the plan *is* to do so next weekend, I can put it off: I've put it off
before...)

Plus I have plenty of backups. :)

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