Re: detected XactErr

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On Wed, 29 Aug 2012, Gary E. Miller wrote:

> Yo Alan!
> 
> On Wed, 29 Aug 2012 10:07:41 -0400 (EDT)
> Alan Stern <stern@xxxxxxxxxxxxxxxxxxx> wrote:
> 
> > > OK, fair enough, but does it need to keep flooding my logs?  Can
> > > we rate limit that a bit?
> > 
> > Easy enough to do; simply disable CONFIG_USB_DEBUG.
> 
> Uh, not easy.  This is a production machine.  Acceptable downtime is
> very small.  There should be a way to turn it off at runtime.

No, there shouldn't.  It's a debugging feature; while debugging we 
want to see all occurrences of these messages.

Production machines should not run debugging kernels.

> > > I really doubt it is a hardware error since this appeared after the
> > > last kernel update.  
> > 
> > If you think it's caused by a problem in the kernel then you can try 
> > using git bisect to track it down.
> 
> Sadly the problem went away after a reboot.  I suspect an initialization
> issue, but doing a git bisect of an intermittent problem on a production
> machine is not gonna happen.

Especially if the problem doesn't reappear.  One-time issues are very 
hard to fix.

> Sadly this machine is the only one with the rare hardware that the
> driver did not get exactly right.

Alan Stern

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