On Fri, Feb 20, 2009 at 11:18:56PM +0000, Paul O'Keefe wrote:
> There was another Kernel release for Jaunty today, version 2.6.28-8.24
> which continues to exhibit the same behavior.
> 
> I have open defect reports against their barry-util package and an open
> question against the kernel defect mailing list, but no acknowledgement
> from the package maintainers.

Thanks for your continued testing.


> What steps do I take to debug this into the correct place in the
> Kernel? I have debug symbols on a custom kernel turned on for the mutex
> routines where opensync hangs. And I have the debug function enabled to
> create the kernel debug point under /proc.

Well, since it works on .27, the issue is somewhere in the kernel, and
it could be a timing thing.  I'm not expert enough to look at a kernel
log and be able to find a fix.

My first plan of attack would be to download and compile my own vanilla kernel,
using the same config from the Jaunty packages, and seeing if a vanilla
kernel shows the same results.  I'd try the latest vanilla 2.6.28.7.

If this doesn't fix it, let me know, because I could easily upgrade to that
and potentially reproduce it here.  If it is a problem in the vanilla
kernel, we should team up and try to reproduce it on my end, and then go
straight to the kernel mailing list.

If going vanilla does fix it, then the problems are in Ubuntu's patches,
and it's just a matter of bisecting through their changes to find
the patch that introduces the problem.   (I'm using git terminology
here... and it looks like Ubuntu uses git for their kernels, so this
should be workable.)

That's a bit of grunt work, but would guarantee finding the problem eventually.
Unless you have a better plan, that's how I'd tackle it.

- Chris


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