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Date:      Sat, 19 Feb 2011 18:40:08 -0800
From:      Jack Vogel <jfvogel@gmail.com>
To:        Brandon Gooch <jamesbrandongooch@gmail.com>
Cc:        Pawel Tyll <ptyll@nitronet.pl>, freebsd-net@freebsd.org, Luigi Rizzo <rizzo@iet.unipi.it>, freebsd-ipfw@freebsd.org
Subject:   Re: [Panic] Dummynet/IPFW related recurring crash.
Message-ID:  <AANLkTi=CLDFGxLQ8rdq3hg0KN9aYZA_YDwDWbqk5gcz2@mail.gmail.com>
In-Reply-To: <AANLkTimWkWYj=HB5BTM0nwYWgNia-Wq4bYHsRB=OjVP7@mail.gmail.com>
References:  <410175608.20110220013900@nitronet.pl> <AANLkTimWkWYj=HB5BTM0nwYWgNia-Wq4bYHsRB=OjVP7@mail.gmail.com>

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I've never seen a trace like this, and no absolutely nothing about dummynet,
sorry.
If it is in some way em's fault, then making sure you have the latest code
would be
a good idea. I have a test driver that is under selective test, it does
effect the code
path that you seem to be in, so it might be worth a try. If you want to try
it early
just pipe up and I'll send it.

Jack


On Sat, Feb 19, 2011 at 6:16 PM, Brandon Gooch
<jamesbrandongooch@gmail.com>wrote:

> 2011/2/19 Pawel Tyll <ptyll@nitronet.pl>:
> > Hi guys, lists,
> >
> > It's me, the bi-weekly panic guy. Guess what, it crashed today. As an
> > act of desperation I disabled the pipe dumping script after previous
> > crash, which today turned out to be merely a coincidence and didn't
> > prevent panics. (I thought it to be a longshot anyway, but it was the
> > only change I could associate with beginning of this). The only fix I
> > could come up with, that's very wrong on so many levels, is...
> >
> > 30 1 * * 7 /sbin/shutdown -r +210m "Scheduled weekly reboot."
> >
> > :(
> >
> > ...but it solves it all: panics, inability to dump (which leads to
> > freeze and requires manual intervention to bring system back up). Oh
> > well.
> >
> > Since nobody came up with any interest in having this properly
> > investigated, then I suppose I'm the only one that uses dummynet for
> > some larger-scale traffic shaping - maybe that's my mistake? What
> > others are using? Other tools, Linux, proprietary traffic shapers? I
> > really have trouble writing another sentence in a way that won't make
> > me look like an arrogant schmuck that feels entitled to free support,
> > so I'll stop here. Any more ideas/hints what to do next/pointers how
> > to debug this properly are of course still welcome.
>
> Same backtrace as reported here?
>
> http://www.freebsd.org/cgi/query-pr.cgi?pr=152360
>
> What revision of the em(4) driver code are you using? I know Jack has
> been working out certain quirky issues lately, and there have been
> updates to the code since last you posted an update to your problem.
>
> STABLE:
> http://svn.freebsd.org/viewvc/base?view=revision&revision=217711
>
> RELENG:
> http://svn.freebsd.org/viewvc/base?view=revision&revision=217865
>
> Maybe Jack could shed some light on the whether the updates could
> somehow work out to be a fix for your problem -- or whether or not
> your issue is even related to the em(4) driver.
>
> -Brandon
>



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