Re: 2.6.15-rt20, "bad page state", jackd

[Nick Piggin <nickpiggin@yahoo.com.au>]

Fernando Lopez-Lezcano wrote:
> On Fri, 2006-03-10 at 09:57 +1100, Nick Piggin wrote:
>
> > Fernando Lopez-Lezcano wrote:

> > Can you test with the latest mainline -git snapshot, or is it only
> > the -rt tree that causes the warnings?
>
>
> I found something strange although I don't know why it happens yet:
>
>   Fedora Core 4 kernel (2.6.15 + patches) works fine.
>   Fedora Core 4 kernel + -rt21, [ahem... sorry], works fine.
>   Fedora Core 4 kernel + -rt21 + alsa kernel modules from 1.0.10 or
>      1.0.11rc3, fails[*]
>   Plain vanilla 2.6.15 + -rt21, works fine
>   Plain vanilla 2.6.15 + -rt21 + alsa kernel modules from 1.0.10 or
>      1.0.11rc3, fails[*]
>
> So, it looks like it is some weird interaction between kernel modules
> that were not compiled as part of the kernel and the kernel itself. The
> "updated" modules are installed in a separate location (not on top of
> the built in kernel modules) and are found before the ones in the kernel
> tree.
>
> I have been building this combination for a long long time with no
> problems, I don't know what might have happened that changed things.
>
> Could be:
> - configuration problems?

No. It shouldn't do this even if there is a configuration problem.

> - the alsa tree is somehow incompatible with the kernel alsa tree, is
>   that even possible?

Yes. Most likely this. It should be fixed before the new ALSA code is
pushed upstream.

It is probably not so much a matter of somebody breaking the ALSA code
as that it hasn't been updated for the new kernel refcounting rules.

--
SUSE Labs, Novell Inc.
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