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Date:      Mon, 24 Jan 2011 11:11:12 -0600
From:      Brandon Gooch <jamesbrandongooch@gmail.com>
To:        Pawel Tyll <ptyll@nitronet.pl>
Cc:        freebsd-net@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it>, Jack Vogel <jfvogel@gmail.com>, freebsd-ipfw@freebsd.org
Subject:   Re: [Panic] Dummynet/IPFW related recurring crash.
Message-ID:  <AANLkTi=UJHtvEm5k-Cxrtdr-2k_3_hyR_F8GuUwmHmE4@mail.gmail.com>
In-Reply-To: <13247006.20110124020848@nitronet.pl>
References:  <201953550.20110106221821@nitronet.pl> <AANLkTikozeXLQtePk1niH-N58n9f6xAVGVBTmLPux2e-@mail.gmail.com> <57312439.20110107171430@nitronet.pl> <AANLkTikZAHNRu_3=i5_0FTNOMua8Kr2bW7H+RJZ4c=PW@mail.gmail.com> <13247006.20110124020848@nitronet.pl>

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On Sun, Jan 23, 2011 at 7:08 PM, Pawel Tyll <ptyll@nitronet.pl> wrote:
> On Fri, Jan 7, 2011, Brandon Gooch <jamesbrandongooch@gmail.com> wrote:
>> It's likely that the mbuf handling problem (in em_refresh_mbufs()) is
>> triggered by the processing you're doing with ipfw (or elsewhere for
>> that matter), so, yes, I think it's a bug fixed in the revision
>> discussed.
>
>> When you update and test, please let us know. Also, don't forget to
>> submit a follow-up to your PR.
>
> Unfortunately bad news:
>
> Machine fell after 14 days, 22:31:42 for the same reason according to
> what was left of panic screen. It didn't do a dump, nor reboot as is
> customary since some time on S3420GP boards (and other Intel server
> boards, since colleague has dual-cpu board from same epoch).
>
> What can I try next?

I'm not sure. Perhaps there is another code path in the em(4) driver
that leads to the same, bad-pointer state. I'll have to defer to Jack
Vogel or Luigi Rizzo for potential insight into the issue.

Please provide as much information as possible (even if it comes down
to taking a photo of the console, or transcribing the backtrace).

FYI, I haven't been able to test this on any of my setups yet...

-Brandon



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