Re: [bisected] NFS corruption with 3.4

[Ondrej Zary <linux@rainbow-software.org>]

On Tuesday 05 June 2012, Dave Jones wrote:
> On Tue, Jun 05, 2012 at 11:16:17AM +0200, Ondrej Zary wrote:
>  > Hello,
>  > I use NFS for deploying HDD images on new machines. My machine has 2nd
>  > network card just for this, running DHCPD, TFTPD and kernel NFS server.
>  > The target machine is set to boot from LAN and boots SystemRescueCD from
>  > my machine with an autorun script that launches Partimage and deploys
>  > the HDD image (400 to 900 MB compressed).
>  >
>  > It worked fine for years, until now. With kernel 3.4, everyting
>  > works only for the first time after boot (and not always). Next time
>  > (next machine), partimage aborts almost immediately as it's probably
>  > unable to decompress the image file. md5sum is different on my machine
>  > vs. on the target (through NFS). Also SystemRescueCD boot aborts with
>  > md5 error sometimes. Everything works fine after rebooting back to 3.3.
>  >
>  > Bisection found this:
>  >
>  > 0fc9d1040313047edf6a39fd4d7c7defdca97c62 is the first bad commit
>  > commit 0fc9d1040313047edf6a39fd4d7c7defdca97c62
>  > Author: Konstantin Khlebnikov <khlebnikov@openvz.org>
>  > Date:   Wed Mar 28 14:42:54 2012 -0700
>  >
>  >     radix-tree: use iterators in find_get_pages* functions
>  >
>  > Reverting this commit in 3.4 fixes the problem.
>
> I meant to come back to this, because I saw this problem too.
>
> is this patch a problem for the client, or the server ?
> I'm assuming the server, because I saw at least a similar sounding
> problem using an OSX client->Linux server.
>
> 	Dave

Yes, this patch breaks Linux NFS server.

-- 
Ondrej Zary