From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sven-Thorsten Dietrich <sven@thebigcorporation.com>
Subject: Re: 2.6.33.6-rt28 kernel oops while stressing network
Date: Fri, 13 Aug 2010 13:17:08 -0700
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Cc: linux-rt-users@vger.kernel.org
To: John Culvertson <jculvertson@gmail.com>
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  On 08/13/2010 11:07 AM, John Culvertson wrote:
> Thanks for the suggestions.  I have tried the unpatched 2.6.33.7
> kernel, and the problem does not occur.  The hardware is a single
> board industrial computer with the network controllers onboard, so I
> cannot easily try different NICs.  I have not seen the problem occur
> with only one port in use, but I have not tested that long enough to
> be positive.
>
> One thing that may be a little odd about this computer is that both
> Ethernet controllers (Intel 82559) share the same PCI interrupt.
> Interrupt sharing should be OK, but since adjacent PCI slots in normal
> PCs generally use different interrupts, it may not occur often in
> other systems.
>

Does it reproduce when you turn off PREEMPT_RT, but leave all the IRQ 
threading options enabled?