r320183 (rpc.lockd cleanup) breaks virtualbox-ose build

[Don Lewis]

On 21 Jul, Ed Maste wrote:
> On 11 July 2017 at 12:44, Don Lewis <truckman at freebsd.org> wrote:
>> This is a really strange problem ...
>>
>> Last week I upgraded my 12.0-CURRENT package build box from r318774 to
>> r320570.  I also upgraded the poudriere jail to match.  When I went to
>> build packages, the virtualbox-ose build failed due to ar segfaulting.
> 
> Can you give the patch in https://reviews.freebsd.org/D11687 a try?

I still see ar segfault.  I'm also really curious about how the
rpc.lockd change can trigger the bug.