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Date: Wed, 27 May 2015 09:09:13 -0400
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Subject: Re: svn commit: r283602 - in head/sys:
 cddl/contrib/opensolaris/uts/common/fs/zfs kern
From: Benjamin Kaduk <bjkfbsd@gmail.com>
To: Konstantin Belousov <kib@freebsd.org>
Cc: "src-committers@freebsd.org" <src-committers@freebsd.org>, 
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On Wed, May 27, 2015 at 5:22 AM, Konstantin Belousov <kib@freebsd.org>
wrote:

> Author: kib
> Date: Wed May 27 09:22:50 2015
> New Revision: 283602
> URL: https://svnweb.freebsd.org/changeset/base/283602
>
> Log:
>   Right now, dounmount() is called with unreferenced mount point.
>   Nothing stops a parallel unmount to suceed before the given call to
>   dounmount() checks and locks the covered vnode.  Prevent dounmount()
>   from acting on the freed (although type-stable) memory by changing the
>   interface to require the mount point to be referenced.  dounmount()
>   consumes the reference on return, regardless of the sucessfull or
>   erronous result.
>

Should __FreeBSD_version get bumped?

-Ben