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Date:      Fri, 14 Aug 2009 19:01:32 +0400
From:      Ruslan Ermilov <ru@freebsd.org>
To:        Ian FREISLICH <ianf@clue.co.za>
Cc:        "Bjoern A. Zeeb" <bzeeb-lists@lists.zabbadoz.net>, FreeBSD current mailing list <current@freebsd.org>
Subject:   Re: panic in netisr (I think) + DUMP FAILED (ERROR 6)
Message-ID:  <20090814150132.GF69960@edoofus.dev.vega.ru>
In-Reply-To: <E1Mbx7k-0001zP-UW@clue.co.za>
References:  <20090814120602.GA64565@edoofus.dev.vega.ru> <20090814080044.A93661@maildrop.int.zabbadoz.net> <E1MbqAJ-0001Cm-0j@clue.co.za> <E1MbsRG-0001Ra-AY@clue.co.za> <E1Mbx7k-0001zP-UW@clue.co.za>

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On Fri, Aug 14, 2009 at 03:47:16PM +0200, Ian FREISLICH wrote:
> Ruslan Ermilov wrote:
> > On Fri, Aug 14, 2009 at 10:47:05AM +0200, Ian FREISLICH wrote:
> > > Do you have any idea why kernel dumps are not working as shown in
> > > the OP?
> > > 
> > There was a message, "Attempt to write outside dump device boundaries.",
> > that explains that.  Search the mailing list archives where I explained
> > the underlying bug with current versions of FreeBSD (in short page maps
> > get updated while we're writing a dump, due to interrupts still enabled).
> 
> And then, this bug is probably why my dumps have been unusable since
> about 12 months now?  These (2) servers have a continuous interrupt
> rate in excess of 40k/s, network related, so interrupts during
> dumping are highly likely.  Reading that thread I'm given to believe
> that the problem exists only for mini-dumps.  I've had crashes
> without cores with (and without) mini-dumps enabled, but I've only
> recently started capturing console output, so I'll see what happens
> on its next crash.  They reliably crash at least once a week.
> 
True: only on SMP and only with minidumps enabled.


Cheers,
-- 
Ruslan Ermilov
ru@FreeBSD.org
FreeBSD committer



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