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SubjectRe: atl1 64-bit => 32-bit DMA borkage (reproducible, bisected)
On Sun, Apr 20, 2008 at 06:06:07AM -0500, Jay Cliburn wrote:
> On Sun, 20 Apr 2008 15:14:53 +0400
> Alexey Dobriyan <adobriyan@gmail.com> wrote:
>
> > On Sat, Apr 19, 2008 at 09:54:44PM -0500, Jay Cliburn wrote:
> > > On Sat, 19 Apr 2008 18:45:35 +0400
> > > Alexey Dobriyan <adobriyan@gmail.com> wrote:
> > >
> > > > OK, nailed it.
> > > >
> > > > It's commit 5f08e46b621a769e52a9545a23ab1d5fb2aec1d4 aka "atl1:
> > > > disable broken 64-bit DMA".
> > > >
> > > > With this commit in tree, I can reproduce either
> > > > a) kmalloc-2048 corruption after initscripts shutdown eth0
> > > > http://marc.info/?l=linux-kernel&m=120820360221261&w=2
> > > >
> > > > b) or oopses at filp_close() first reported long ago
> > > > (sorry, can't find that email)
> > > >
> > > > c) or hard hang after initscripts shutdown eth0 with even SysRq
> > > > not working.
> > > > http://marc.info/?l=linux-kernel&m=120795046008115&w=2
> > > >
> > > > I have two boxes one with atl1, 4G RAM with 2G remapped after 4G
> > > > boundary, another with r8169 connected with just ethernet cable.
> > > > NICs agree on 1Gbps speed.
> > > >
> > > > So, it's enough to scp 200 MB git archive and immediately start
> > > > rebooting sequence for horrors described above to appear. It's not
> > > > 100% reproducible but more like 90%.
> > >
> > > Do I understand correctly that these failures occur only while the
> > > network interface is going down?
> >
> > Yep. During up or running there were no problems with this card.
> >
>
> One more question: Does it happen whether or not you're using atl1 as
> a netconsole?

Without netconsole bugs happens too.



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