From owner-freebsd-fs@freebsd.org  Thu Aug 27 21:06:27 2015
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Subject: Re: Panic in ZFS during zfs recv (while snapshots being destroyed)
To: Karl Denninger <karl@denninger.net>, freebsd-fs@FreeBSD.org
References: <55BB443E.8040801@denninger.net> <55CF7926.1030901@denninger.net>
 <55DF7191.2080409@denninger.net>
From: Andriy Gapon <avg@FreeBSD.org>
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Date: Fri, 28 Aug 2015 00:05:28 +0300
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On 27/08/2015 23:22, Karl Denninger wrote:
> traceback is at http://www.denninger.net/kvmimage.png; apologies for the
> image traceback but this is coming from a remote KVM.

Did you manage to get a crash dump?

A patch from this review request https://reviews.freebsd.org/D2794 might
happen to be a fix for this problem, although originally it was develop
to address a different kind of an unmount race.

-- 
Andriy Gapon