Date: Fri, 21 Mar 2008 22:17:43 +0100 (CET)
From: Mikulas Patocka <mikulas@artax.karlin.mff.cuni.cz>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
cc: linux-kernel@vger.kernel.org
Subject: Re: APM crashes when IO is going on
In-Reply-To: <200803212215.54854.rjw@sisk.pl>
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 <200803210127.56437.rjw@sisk.pl> <Pine.LNX.4.64.0803212055550.6726@artax.karlin.mff.cuni.cz>
 <200803212215.54854.rjw@sisk.pl>
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> > I found another problem --- present in 2.6.23.1, 2.6.25rc3, 2.6.25rc6
> > 
> > --- when I run three threads concurrently reading raw disk partition and 
> > suspend, I get 100% reproducible failure. (with one thread running it 
> > usually succeeds, sometimes fail)
> 
> Are they userland threads or kernel threads?

Useland threads. Just dd if=/dev/hda of=/dev/null

> > Either the on-going I/O will jam BIOS and I need to remove power to 
> > continue.
> > 
> > Or the machine suspends, wakes up and reports "hda: lost interrupt" 
> > (2.6.23.1 was able to recover from this condition, 2.6.25rc3,6 does not 
> > recover and it is not able to send any more disk IOs).
> > 
> > How is suspending disk IO supposed to work?
> 
> That depends on the driver, if I understand your question correctly.

The driver is normal IDE.

> > And why it doesn't?
> 
> Hard to tell.  You didn't provide much information ...
> 
> Thanks,
> Rafael

Mikulas
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