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From: YongHyeon PYUN <pyunyh@gmail.com>
Date: Mon, 10 Jun 2013 09:59:25 +0900
To: Lev Serebryakov <lev@freebsd.org>
Subject: Re: fxp0 interface going up/down/up/down (dhclient related?)
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Cc: Jeremy Chadwick <jdc@koitsu.org>,
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On Sun, Jun 09, 2013 at 09:13:33PM +0400, Lev Serebryakov wrote:
> Hello, Jeremy.
> You wrote 9 июня 2013 г., 14:44:01:
> 
> JC> The issue is described in the 8.4-RELEASE Errata Notes; the driver is
> JC> using the same driver version as in stable/9, hence you're experiencing
> JC> the same problem.  See Open Issues:
>    I had some memory, that I had had this problem on my router some time
>  (year? two years? three?) ago, and it was fixed somehow at then-HEAD
>  (9?) system with disabling link down event on fxp(4), caused by chip
>  reset after address setting. Is it deja-vu or true memory?

There was a bug at the time but it was fixed long time ago. Current
issue is different one but the end result looks very similar to
the old bug.