From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Aneesh Kumar K.V" Subject: Re: possible (ext4 related?) memory leak in kernel 2.6.26 Date: Fri, 3 Oct 2008 00:06:13 +0530 Message-ID: <20081002183613.GC29613@skywalker> References: <20080930202728.GA6358@goelette.ens.fr> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, David.Madore@ens.fr To: Quentin Godfroy Return-path: Received: from E23SMTP04.au.ibm.com ([202.81.18.173]:49576 "EHLO e23smtp04.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752502AbYJBSgc (ORCPT ); Thu, 2 Oct 2008 14:36:32 -0400 Content-Disposition: inline In-Reply-To: <20080930202728.GA6358@goelette.ens.fr> Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On Tue, Sep 30, 2008 at 10:27:29PM +0200, Quentin Godfroy wrote: > Hi lists, > > I'd like to report the following problem : after ~ 10 days' uptime on a > Debian 2.6.26-1-686 kernel, my system becomes extremely sluggish and > unresponsive and the OOM-killer starts targeting even innocent processes like > identd or rsync (when the swap is disabled). The machine is low on RAM (192 > MB) but this has never been a problem before. As for the slowness, strace > shows that the brk() syscall takes ages to complete; the blocking processes > are in the D state (and for some reason the kernel gives no wchan info). > > Free reports a large and constantly growing 'buffers' figure (more than > 50% of the available memory). No userland processes seems to be consuming > lare amounts of memory (sum of RSS in 'ps aux' is about 30 megs), and the > overall system is mostly idle. > We actually fixed one in 6be2ded1d7c51b39144b9f07d2c839e1bd8707f1. It is not really a memory leak. But yes it was not releasing some the prealloc space memory. -aneesh