K 10
svn:author
V 3
pjd
K 8
svn:date
V 27
2012-09-22T12:41:49.309276Z
K 7
svn:log
V 243
Use the topology lock to protect list of providers while withering them.
It is possible that provider is destroyed while we are iterating over the
list.

Reported by:	Brian Parkison <parkison@panzura.com>
Discussed with:	phk
MFC after:	1 week

END