From owner-freebsd-current@freebsd.org  Tue Oct  8 21:36:52 2019
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Subject: Re: panic: Assertion in_epoch(net_epoch_preempt) failed at ...
 src/sys/net/if.c:3694
To: current@freebsd.org
References: <20191008121519.GS1263@albert.catwhisker.org>
From: Julian Elischer <julian@freebsd.org>
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Date: Tue, 8 Oct 2019 14:36:43 -0700
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Is there a paper or good description of the epoch concept? (more 
readable than epoch(9)).
Haven't been to enough BSD confs recently.

julian