mdadm(IMSM): Unsupported attributes : 40000000

Hi,

after updating to mdadm 3.2.2 (by way of upgrading from Fedora 14 to
15) from 3.1.5 I am no longer able to boot my IMSM raid, which I was
able to for the last 5 years or so.

The errors I am getting are:

  mdadm(IMSM): Unsupported attributes : 40000000
  mdadm: IMSM metadata loading not allowed due to attributes incompatibility.

I tracked that down to the patch at

http://www.spinics.net/lists/raid/msg34783.html

According to that patch 40000000 means #define MPB_ATTRIB_NEVER_USE
__cpu_to_le32(0x40000000). Any advice why an unused but aparently set
attribute should stop the raid to boot?

For now I am up and running with 3.1.5 but would like to keep up with
the latest mdadm if possible.

Thanks
Thomas
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