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Date:      Fri, 22 Oct 2010 16:49:06 +0200
From:      Ivan Voras <ivoras@freebsd.org>
To:        freebsd-stable@freebsd.org
Subject:   Re: repeating crashes with 8.1
Message-ID:  <i9s892$spp$1@dough.gmane.org>
In-Reply-To: <201010221425.o9MEPcWC094867@lava.sentex.ca>
References:  <m2zku7cqt5.wl%randy@psg.com> <m2y69rcqjc.wl%randy@psg.com>	<201010221416.o9MEGSa0094817@lava.sentex.ca>	<m2tykeb9ac.wl%randy@psg.com> <201010221425.o9MEPcWC094867@lava.sentex.ca>

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On 10/22/10 16:25, Mike Tancsa wrote:
> At 10:18 AM 10/22/2010, Randy Bush wrote:
>> > Do you know how this panic is triggered ? Are you able to
>> > create it on demand ?
>>
>> no i do not.  bring server up and it'll happen in half an hour.
>>
>> and the server was happy for two months.  so i am thinking hardware.
> 
> Perhaps. The reason I ask is that I had a box go down last night with
> the same set of errors.  The box has a number of ipv6 routes, but its
> next hop was down and the problems started soon after. So I wonder if it
> has something to do with that.  Do you have ipv6 on this box and are all
> the next hop addresses correct / reachable ?
> 
> Oct 22 02:06:02 i4 kernel: em1: discard frame w/o packet header
> Oct 22 02:06:10 i4 kernel: em2: discard frame w/o packet header
> Oct 22 02:06:21 i4 kernel: em1: discard frame w/o packet header

FWIW I had a series of crashes with those characteristics which I
suspected were IPv6 or 6to4-related on 8.0-RELEASE and 8-STABLE which
eventually made me give up on IPv6 - it was crashing too often (couple
of times a week).

I have at least a couple of threads on this on freebsd-net@ (without
resolution).




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