linux-kernel - Re: Why kmem_cache_free occupy CPU for more than 10 seconds?

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Message-ID: <84144f020704102353r7dcc3538u2e34237d3496630e@mail.gmail.com>
Date:	Wed, 11 Apr 2007 09:53:53 +0300
From:	"Pekka Enberg" <penberg@...helsinki.fi>
To:	"Zhao Forrest" <forrest.zhao@...il.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org
Subject: Re: Why kmem_cache_free occupy CPU for more than 10 seconds?

On 4/11/07, Zhao Forrest <forrest.zhao@...il.com> wrote:
> We're using RHEL5 with kernel version 2.6.18-8.el5.
> When doing a stress test on raw device for about 3-4 hours, we found
> the soft lockup message in dmesg.
> I know we're not reporting the bug on the latest kernel, but does any
> expert know if this is the known issue in old kernel? Or why
> kmem_cache_free occupy CPU for more than 10 seconds?

Sounds like slab corruption. CONFIG_DEBUG_SLAB should tell you more.
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