linux-kernel - Re: inode leak in 2.6.24?

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:	Thu, 21 Feb 2008 08:15:52 +1100
From:	David Chinner <dgc@....com>
To:	Ferenc Wagner <wferi@...f.hu>
Cc:	David Chinner <dgc@....com>, linux-kernel@...r.kernel.org
Subject: Re: inode leak in 2.6.24?

On Wed, Feb 20, 2008 at 03:36:53PM +0100, Ferenc Wagner wrote:
> David Chinner <dgc@....com> writes:
> > The xfs inodes are clearly pinned by the dentry cache, so the issue
> > is dentries, not inodes. What's causing dentries not to be
> > reclaimed?  I can't see anything that cold pin them (e.g. no filp's
> > that would indicate open files being responsible), so my initial
> > thoughts are that memory reclaim may have changed behaviour.
> >
> > I guess the first thing to find out is whether memory pressure
> > results in freeing the dentries. To simulate memory pressure causing
> > slab cache reclaim, can you run:
> >
> > # echo 2 > /proc/sys/vm/drop_caches
> >
> > and see if the number of dentries and inodes drops. If the number
> > goes down significantly, then we aren't leaking dentries and there's
> > been a change in memoy reclaim behaviour. If it stays the same, then
> > we probably are leaking dentries....
> 
> Hi Dave,
> 
> Thanks for looking into this.  There's no real conclusion yet: the
> simulated memory pressure sent the numbers down allright, but
> meanwhile it turned out that this is a different case: on this machine
> the increase wasn't a constant growth, but related to the daily
> updatedb job.  I'll reload the original kernel on the original
> machine, and collect the same info if the problem reappers.

Ok, let me know how it goes when you get a chance.

Cheers,

Dave.
-- 
Dave Chinner
Principal Engineer
SGI Australian Software Group
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/