RE: Kernel failure while writing DVD-RAM

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On Wed, 2009-11-18 at 10:43 +0000, Dave Higton wrote:

Hello Dave,

Sorry for the late reply.
Somehow missed you message due to excessive F12-release noise. :)


> OK.  I've just been Googling for warn_slowpath, but although I've
> found lots of examples, I don't know what it means.  My guess is
> that it's used as a diagnostic by some code, probably kernel code,
> so the next challenge is to find where it was called from.  Yes?

I tried tracking down the kernel code... 


> 
> > Are you getting a real crash or some kind of failure.
> 
> More information since my original posting: fillDVD2 is a test app
> that I wrote as part of an effort to test the ability of Fedora to
> write DVD-RAM discs.  We have experienced numerous failures, but
> we don't yet understand why.
> 
> fillDVD2 wasn't testing for errors.  An error occurred somewhere,
> but fillDVD2 carried on trying to write to the DVD-RAM disc.  This
> doesn't work; once DVD-RAM writing has failed, no subsequent
> attempts will succeed.  The disc has to be ejected.
> 
> I revised fillDVD2 to stop on an error.  A subsequent test showed
> that the first error, at a similar point (when the disc was within
> a few hundred MB of getting full), was "I/O error".  Not very
> meaningful to me.

Other than the WARN_ON, are you seeing anything useful in the kernel
log?

> uname -a says:
> 2.6.27.38-170.2.113.fc10.i686 #1 SMP Wed Nov 4 17:55:39 EST 2009
> i686 i686 i386 GNULinux

> We originally wanted to use CentOS but were never able to solve
> a real-time problem it gave us: we need to service interrupts from
> our cards every 32 ms.  Normally the IRQ is active for no more than
> 8 us before it's serviced; under CentOS this would often exceed 20 ms
> and we would lose data.
> 

Weird. 8us sounds right under both RHEL and Fedora.
Care to take it off ML?

- Gilboa


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