Re: DMA trouble with current xen-sparse

[Daniel Veillard <veillard@redhat.com>]

On Mon, Nov 07, 2005 at 04:28:59PM -0500, Stephen C. Tweedie wrote:
> Hi,
> 
> On Fri, 2005-11-04 at 14:50 +0000, Ian Pratt wrote:
> 
> >  > Sure, took a bit of time to recompile the kernel (I didn't do 
> > > this for years) and it crashed as expected, here are the info:
> > > 
> > >   ptr: f160ed8e 1514
> > > 
> > > the size looks a full ethernet frame, i.e. 1500 of payload, 2 
> > > ethernet addresses and the 2bytes for the ethernet type, that 
> > > looks kosher to me but clearly it is not aligned.
> > 
> > Please can you try using either our -xen or -xen0 kernel config. I
> > strongly suspect there's something in your config that is breaking this
> > for you, just not sure what.
> 
> I just tried to build it; it would not boot.  That was building the
> 2.6.12 xen-sparse w/ gcc4; retrying with gcc32 now.
> 
> But I suspect that the problem is CONFIG_SLAB_DEBUG.  That sets up slab
> redzoning which checks for buffer overruns.  One consequence is that

  Just to confirm that CONFIG_SLAB_DEBUG is the one exposing the issue.
I recompiled the exact same kernel with just that option turned off
and the tg3 driver does not seems to hang anymore.

Daniel

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