mpr(4) SAS3008 Repeated Crashing

[Sean Bruno]

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We're starting to look into cabling and whatnot on a group of
Supermicro hosts we're using after repeatedly running into a
crash/timeout that more or less looks like the following capture from
the serial console:

https://people.freebsd.org/~sbruno/mpr_stable10.txt

sean
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