linux-kernel - Re: APM crashes when IO is going on

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Date:	Fri, 21 Mar 2008 22:45:13 +0100
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Mikulas Patocka <mikulas@...ax.karlin.mff.cuni.cz>
Cc:	linux-kernel@...r.kernel.org,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Subject: Re: APM crashes when IO is going on

On Friday, 21 of March 2008, Mikulas Patocka wrote:
> > > 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.

Do you mean IDE_GENERIC/BLK_DEV_GENERIC?

Rafael
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