linux-kernel - Re: 2.6.23-rc9 kswapd infinite loop

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Message-ID: <20071009131638.190989af@cuia.boston.redhat.com>
Date:	Tue, 9 Oct 2007 13:16:38 -0400
From:	Rik van Riel <riel@...hat.com>
To:	"Mr. Berkley Shands" <bshands@...gy.com>
Cc:	<linux-kernel@...r.kernel.org>
Subject: Re: 2.6.23-rc9 kswapd infinite loop

On Tue, 09 Oct 2007 11:32:46 -0500
"Mr. Berkley Shands" <bshands@...gy.com> wrote:

> I have a reproducible hang with kswapd in the run queue, everything else is
> in an i/o wait. The load average is climbing.

> Hints anyone (please) as to how to slay this dragon?

Since kswapd is running the whole time, sysrq-P could give a useful set of
backtraces (with a bit of luck).  With a handful of different backtraces
it should be obvious which functions kswapd is looping through.

Once we have that, I'll try to whip up a patch to get it fixed.

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