RAID-6: help wanted

Okay, it's well overdue to do this...

There is currently a data-corruption bug in the RAID-6 md layer
(raid6main.c).  I have so far not been successful in locating it,
although it is easily reproducible, thanks to a set of scripts by Jim
Paris.  I suspect it is a race condition between raid6d and the rest
of the kernel.

The problem is that I already have way too many projects in flight,
and I *really* would like to focus the time I have on getting
klibc/early userspace integrated.  Thus, I don't expect to have any
time at chasing the RAID-6 corruption bug any time soon.

What can be ruled out is errors in the RAID-6 algorithm codes,
however.  Those are easily testable in isolation and have a clean bill
of health.

        -hpa
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