Re: [uml-devel] Integer overflows in new AIO ubd driver

[Gerd Stolpmann <info@gerd-stolpmann.de>]

Am Mittwoch, den 29.03.2006, 14:33 -0500 schrieb Jeff Dike:
> On Mon, Mar 27, 2006 at 05:47:31PM +0200, Gerd Stolpmann wrote:
> > I used iozone in various ways. The simplest workload leading to problems
> > was:
> > 
> > - Write a 5GB file
> > - Write it again
> > - Read it back
> > - Read it back
> > 
> > This benchmark ran fine the first time I started it. When I started it
> > again, UML locked up in the middle. This is reproducible.
> 
> I'm interpretting that description as being this command:
> 	iozone -s 5G -i 0 -i 0 -i 1 -i 1
> 
> Yes?

Almost:

iozone -i 0 -i 1 -r 64k -s 5G -e -f /Data/testfile -U /Data

i.e. record size is 64K, and there is a umount/mount between the
runs. /Data is an ext3 filesystem with 4k block size, on a 20 G
partition.

> And it runs fine here.

For me it runs fine only the first time I call it. The next time UML
locks up.

Can I do something to find out more details?

Gerd
-- 
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Gerd Stolpmann * Viktoriastr. 45 * 64293 Darmstadt * Germany 
gerd@gerd-stolpmann.de          http://www.gerd-stolpmann.de
Phone: +49-6151-153855                  Fax: +49-6151-997714
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