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From: John Baldwin <jhb@freebsd.org>
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Date: Mon, 30 Jan 2012 09:22:26 -0500
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	(bigwig.baldwin.cx); Mon, 30 Jan 2012 13:44:24 -0500 (EST)
Cc: jfv@freebsd.org, freebsd-net@freebsd.org
Subject: Re: em0 hangs on 8-STABLE again
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On Sunday, January 29, 2012 4:38:39 am Lev Serebryakov wrote:
> Hello, Freebsd-net.
> 
>   My home server lost connection on em0 this night again. It was
> persistent problem some times ago, but with version 7.2.3 it is first
> time, but with worse symptoms.
> 
>   It looks like undetected hardware hang-up: no packets could be sent
> or received, and no any output in dmesg or log files. Interface
> up/down with ifconfig and cable unplugging doesn't help: ifaces sees
> all these changes, but no packets could be sent/received anyway. I
> was forced to reboot server to make it work again.
> 
>   IT is rather old 8-STABLE (Oct 2011), but it sems, that last change
> in e1000 for 8-STABLE was r223675, in Jun 2011, so it is "fresh"
> sources (I don't believe, that r229147 is related).
> 
>  Output of `sysctl dev.em' when card is not working (but after some up/down
> events) is attached.

Can you grab two snapshots after sending some traffic to it?  You have several 
non-zero error counters, but it would be good to see which ones are changing 
while you are in this state.

-- 
John Baldwin