linux-kernel - Re: 100% iowait on one of cpus in current -git

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Date:	Mon, 22 Oct 2007 11:41:57 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Maxim Levitsky <maximlevitsky@...il.com>
Cc:	linux-kernel@...r.kernel.org
Subject: Re: 100% iowait on one of cpus in current -git

On Mon, 2007-10-22 at 08:22 +0200, Maxim Levitsky wrote:
> Hi,
> 
> I found a bug in current -git:
> 
> On my system on of cpus stays 100% in iowait mode (I have core 2 duo)
> Otherwise the system works OK, no disk activity and/or slowdown.
> Suspecting that this is a swap-related problem I tried to turn swap of, but it doesn't affect anything.
> It is probably some accounting bug.
> 
> If I start with init=/bin/bash, then this disappears.
> I tried then to start usual /etc/init.d scripts then, and first one to show this bug was gpm.
> but then I rebooted the system to X without gpm, and I still see 100% iowait.
> 
> No additional messages in dmesg.

does sysrq-t show any D state tasks?

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