Tracking down a fixed bug: 10h38m problem

Andy Whitcroft apw at canonical.com
Fri Nov 6 18:14:10 GMT 2009


On Fri, Nov 06, 2009 at 10:53:02AM -0600, Steven N. Severinghaus wrote:
> [Resending to bypass moderation queue. -Steve]
> 
> Hi, all. I'm trying to track down something that is causing problems in
> OpenWRT[1] that seems to be fixed with an Ubuntu kernel. In short, our Via
> C3 motherboards hang after about 10 hours and 38 minutes (~32870 seconds,
> plus or minus a few seconds), and they wake up as if no time has elapsed if
> you hit "enter" on the serial console.
> 
> I swapped out the OpenWRT kernel for the one from the 9.04 x86 minimal
> CD[2], and the problem disappeared. This suggests to me that your team has
> possibly fixed this issue, so I'm wondering if it sounds familiar, and if
> you might have a patch to point me to.
> 
> If not, I'd like to try to understand what the differences are between the
> OpenWRT kernel and the Ubuntu kernel. The problem exists even with all of
> the OpenWRT patches disabled, so I should be able to somehow bisect the
> differences between a vanilla kernel and the minimal Ubuntu kernel and
> identify the magic patch. But at over 10 hours for the bug to manifest, I'm
> not looking forward to that process.
> 
> So, does this ring a bell at all?

I don't recognise the symptoms specifically no.  That kernel would have
been 2.6.28 based and we did take a lot of stable updates for that.
My first suggestion would be to try 2.6.28.10 which was the last full
stable we took, and perhaps the latest 2.6.28.x.

-apw



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