From owner-freebsd-stable@freebsd.org  Thu Oct  6 11:10:46 2016
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Date: Thu, 6 Oct 2016 14:10:43 +0300
From: Slawa Olhovchenkov <slw@zxy.spb.ru>
To: Julien Charbon <jch@freebsd.org>
Cc: Julien Charbon <julien.charbon@gmail.com>,
 Konstantin Belousov <kostikbel@gmail.com>, freebsd-stable@FreeBSD.org,
 hiren panchasara <hiren@strugglingcoder.info>
Subject: Re: 11.0 stuck on high network load
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On Thu, Oct 06, 2016 at 09:28:06AM +0200, Julien Charbon wrote:

> 2. thread1:  In tcp_close() the inp is marked with INP_DROPPED flag, the
> process continues and calls INP_WUNLOCK() here:
> 
> https://github.com/freebsd/freebsd/blob/releng/11.0/sys/netinet/tcp_subr.c#L1568

Look also to sys/netinet/tcp_timewait.c:488

And check other locks from r160549