From owner-freebsd-stable@FreeBSD.ORG  Tue Feb 28 21:08:36 2012
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Date: Wed, 29 Feb 2012 01:03:29 +0400
From: Pavel Gorshkov <gorshkov.pavel@gmail.com>
To: freebsd-stable@freebsd.org
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Subject: msk0: interrupt storm
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My laptop running 9.0-RELEASE/amd64/GENERIC freezes and
(sometimes) unfreezes intermittently, logging the following:

Feb 28 23:07:36 lifebook kernel: interrupt storm detected on "irq259:"; throttling interrupt source

$ vmstat -i
...
irq259: mskc0                   11669511       3456


Looks very similar to this:
http://www.freebsd.org/cgi/query-pr.cgi?pr=164569

Any suggestions?