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Re: (ITS#8444) Out-of-sync issue with memberOf overlay, Delta-syncrepl MMR and >2 nodes

Although Quanah hasn't been able to trigger this yet, the regression
test in master he wrote has been consistently able to trigger for me on
my machine, so I've started to investigate.

For posterity and in case anyone is interested, I have uploaded the
testrun/ directory from a failing run (I suspect the fact of this laptop
having a slow 2-core CPU helps) with a slightly patched slapd that
records the thread ID as well since, in part, this seems like a race of
some sort.

The tgz is available at
ftp://ftp.openldap.org/incoming/its8444-regression-testrun-sync,stat.tgz

So far it looks like replica #3's threads 7f50fb7fe700 and 7f51017bb700
are both trying to apply the modification with CSN
20170605125334.856475Z#000000#001#000000 which sends it into a full
refresh.=20

--=20
Ond=C5=99ej Kuzn=C3=ADk
Senior Software Engineer
Symas Corporation                       http://www.symas.com
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