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

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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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