From owner-freebsd-ports@freebsd.org  Wed Apr 20 08:28:21 2016
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To: ports <freebsd-ports@FreeBSD.org>
From: Andriy Gapon <avg@FreeBSD.org>
Subject: minor(?) problem with pkg crashing
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Date: Wed, 20 Apr 2016 11:27:22 +0300
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pkg 1.7.2 crashed at the end of upgrade run, after completing all the upgrades.
Unfortunately no debug symbols, but it looks like a double free or something
like that, seems that this happens only if
> Conflicts with the existing packages have been found.
> One more solver iteration is needed to resolve them.

The crash is in  pkg_jobs_free() -> pkg_free() -> free()

-- 
Andriy Gapon