From owner-freebsd-fs@FreeBSD.ORG  Tue Oct 21 23:19:57 2014
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Date: Tue, 21 Oct 2014 18:19:56 -0500
From: "James R. Van Artsdalen" <james-freebsd-fs2@jrv.org>
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To: alc@freebsd.org
Subject: Re: zfs recv hangs in kmem arena
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Cc: freebsd-fs@freebsd.org, Alan Cox <alan.l.cox@gmail.com>, d@delphij.net,
 "current@freebsd.org" <current@freebsd.org>
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On 10/21/2014 5:03 PM, Alan Cox wrote:
> How up to date is your source tree? r2720221 is relevant. Without that
> change, there are circumstances in which the code that is supposed to
> free space from the kmem arena doesn't get called.

I've tried HEAD/CURRENT at r272749

On 10-STABLE through r273364 - I do a nightly build & test.