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Date: Mon, 12 Nov 2001 16:18:12 -0200 (BRST)
From: Marcelo Tosatti <marcelo@conectiva.com.br>
To: "Gord R. Lamb" <glamb@max-t.com>
Cc: linux-kernel@vger.kernel.org
Subject: Re: I/O lockup
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On Mon, 12 Nov 2001, Gord R. Lamb wrote:

> Hi everyone,
> 
> I've been having a problem for a while now with a strange lockup induced
> under heavy SCSI I/O (particularly when I write directly to block devices
> with dd of=/dev/sd?, but also when writing to a filesystem on that
> device).  I'm writing around 50-100mb/sec over FC (qlogic 2200) under
> Linux 2.4 (tried 2.4.3 through 2.4.10).
> 
> It seems that some vm or I/O related spinlock is being taken and held, but
> not released (?).  There is no oops or BUG() or anything (no messages at
> all in fact).. all I/O just stops.  I can still invoke sysrq, type
> characters at the console, etc.  In fact, usually top continues to run and
> display kswapd as the dominant process.

If kswapd is eating the CPU, its probably a VM problem.

Please try the newest 2.4.xx which has VM updates and if the problem
happens again, tell us.



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