K 10
svn:author
V 5
markj
K 8
svn:date
V 27
2019-06-19T16:09:20.615681Z
K 7
svn:log
V 407
Make zlib encoding messages idempotent.

Otherwise duplicate messages can trigger a reinitialization of the
compression stream while the update thread is running.  Also ensure
that the stream is initialized before the update thread may attempt
to use it.

PR:		238333
Reviewed by:	cem, rgrimes
MFC after:	3 days
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D20673

END