Fix for 5.2-BETA lockup problems

[M. Warner Losh]

In message: <3FC747B1.7C3654E8 at freebsd.org>
            Andre Oppermann <andre at freebsd.org> writes:
: "M. Warner Losh" wrote:
: > 
: > In message: <3FC67F2E.EBF83B89 at freebsd.org>
: >             Andre Oppermann <andre at FreeBSD.ORG> writes:
: > : Please try the attached patch which should fix it.
: > 
: > I've been having crashes all the time since the hostcache went into
: > the tree.  I've been running a few hours with this patch (in which
: > time I should have had a crash).  I think it makes it better.
: 
: Thank you for testing.  I've sent the patch to re@ for approval.

I was able to run overnight.  First time since the hostcache code
went in, so it definitely helps things!

Warner