From owner-freebsd-fs@freebsd.org  Fri Sep 11 19:12:25 2015
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From: Sean Eric Fagan <sef@Kithrup.COM>
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To: freebsd-fs@freebsd.org
Subject: Re: chmod, freebsd10, zfs, and ACLs
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Okay, it's the property aclmode.  When set to discard, it does
weirdness.  When set to passthrough, it behaves as I would expect.

Sean.