linux-kernel - Re: 2.6.xx: NFS: directory motion/cam2 contains a readdir loop

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]

Message-Id: <201107272227.03265.sweet_f_a@gmx.de>
Date:	Wed, 27 Jul 2011 22:26:55 +0200
From:	Rüdiger Meier <sweet_f_a@....de>
To:	Christoph Hellwig <hch@...radead.org>
Cc:	Bryan Schumaker <bjschuma@...app.com>,
	Justin Piszcz <jpiszcz@...idpixels.com>,
	"J. Bruce Fields" <bfields@...ldses.org>,
	linux-nfs@...r.kernel.org, linux-kernel@...r.kernel.org,
	xfs@....sgi.com
Subject: Re: 2.6.xx: NFS: directory motion/cam2 contains a readdir loop

On Wednesday 27 July 2011, Christoph Hellwig wrote:
> On Wed, Jul 27, 2011 at 03:54:49PM -0400, Bryan Schumaker wrote:
> > It should be printing on the second hit of a cookie.
>
> But looking closer at it it only prints the directory name and not
> that of any of the matching cookies, making it pretty useless to
> debug any problem.  (and it makes my previous question to Justin look
> stupid..).
>
>
> But so far I still stick to my previous theory that this sounds like
> a directory offset getting reused.  How is cache invalidation for
> the array supposed to work?  And maybe more importantly, given that
> he can only reproduce it with a .38 client did any bugs get fixed in
> that code recently that might lead to issues with the cache
> invalidation?

At the time I've started this thread
http://comments.gmane.org/gmane.linux.nfs/40863
I had the feeling that the readdir cache changings in 2.6.37 have 
something to do with these loop problems.

After that thread I've accepted that's a general problem with 
ext4/dirindex and nfs but seeing it again on xfs with just 5000 files 
I'm in doubt again.

cu,
Rudi
--
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/