On Monday February 12, aab@cichlid.com wrote:

quoted

However
this "kernel BUG" is something newly introduced in 2.6.20 which should
be fixed in 2.6.20.1.  Patch is below.

I am using raid6. Am I at risk after applying this patch?

I'm not going to say "you are not at risk after applying this patch"
as one never knows about hidden bugs until one finds them.

However this patch is equally applicable to raid6 and if you apply it
you should be able to continue using your raid6 with as much
confidence as before...

NeilBrown