From owner-freebsd-hackers@FreeBSD.ORG  Wed Oct  5 19:23:05 2011
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From: Artem Belevich <art@freebsd.org>
To: Michael Bushkov <bushman@freebsd.org>
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Subject: Re: Does anyone use nscd?
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2011/10/5 Michael Bushkov <bushman@freebsd.org>:
> There are probably 2 things here:
> 1. There's some error in nsswitch<->nscd communication protocol that
> causes nsswitch to write into the closed socket. This is not trivial
> to investigate and will require analyzing nscd and client process logs
> side by side (and possibly adding some more logging).
> 2. Consequences of the aforementioned problem can probably be
> corrected by using _setsockopt(..., SO_NOSIGPIPE) in
> __open_cached_connection() in nscachedcli.c
> (http://www.freebsd.org/cgi/cvsweb.cgi/src/lib/libc/net/nscachedcli.c?rev=1.3).
>
> I have no access to FreeBSD desktop at the moment - Artem, it would be
> cool if you can try the second solution.

That's exactly what I did and it fixed the problem on the client side.
I've posted the patch setting SO_NOSIGPIPE earlier in this thread:
http://lists.freebsd.org/pipermail/freebsd-hackers/2011-October/036539.html

--Artem