RE: [problem captured] Re: cerberus on 2.4.17-rc2 UP

Alex Scheele (
Tue, 8 Jan 2002 22:05:24 +0100

Andrew Morton wrote:
> Alan Cox wrote:
> >
> > > end_request: buffer-list destroyed
> > > hda1: bad access: block=12440, count=-8
> > > end_request: I/O error, dev 03:01 (hda), sector 12440
> > > hda1: bad access: block=12448, count=-16
> >
> > That looks like a race in the IDE/block layer (or somewhere
> above it maybe)
> > Someone trashed a request in progress.
> >
> > > Is this a bug or could it be the hardware's fault? The
> hardware is new lspci
> >
> > Other people have reported it too. Its clearly a kernel race
> Yes, I can generate it at will on two quite different IDE machines
> with the run-bash-shared-mapping script from
> It's on my list of things-to-do, filed under "hard". It even happens
> on uniprocessor, with unmask_irq=0.
> Interestingly, I _think_ it only ever occurs against the
> swap device. But I need to confirm this. Marc, do you
> have swap on /dev/hda1?

I have had this problem on several machines to. But not only
against the swap device. I have 1 machine with a SCSI disk as
root disk /dev/sda1, the swap device is /dev/sda2.
Then there is a 4 disk ide raid0 (software raid) mounted
on /mnt and if i run it there i have the same problem.
This machine is a SMP machine, tho is has also happend
on UP machines.

Hope it helps.

	Alex (

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