On Mon, 3 Oct 2005, Yedidyah Bar-David wrote:

> > The device that works with everything except 2.6.14-rc3 is the card 
> > reader?
> 
> Yes.

It certainly would be worthwhile getting some debugging logs for 
comparison on that.  2.6.14-rc2 and 2.6.14-rc3 don't differ by very much.

> The pen drive.
> 
> > I was unable to download them (error 404).
> 
> Sorry, my mistake - it's in
> <http://www.cs.tau.ac.il/~didi/kernA.log>
> <http://www.cs.tau.ac.il/~didi/kernB.log>
> 
> I can also report that it works with 2.6.8-rc1 and does not work with
> 2.6.8-rc2. Which means the regression happened between these two. Can
> anyone tell me how to see individual patches between them? Or I came to
> the finest point in my binary search and should start looking at the
> code?

At this point you probably want to examine the code.  Or at least the 
portions that changed between -rc1 and -rc2.

However I'm not completely convinced you'll find anything.  Those "Medium 
not present" messages in your log should never occur with a flash device.  
They indicate a hardware or firmware problem.

It might turn out to be something trivial, like your B machine doesn't 
provide sufficient voltage or current on the power connection of the USB 
bus.

Also keep in mind that sometimes failures occur at random.  You might get 
fooled into thinking a particular kernel release is at fault, simply 
because by pure chance the previous release ran okay in your test.

Alan Stern



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