Hi,

I have the foloving setup:

- NFS clients machines running vanilla 2.6.18 (config included) writing on
  NFS mounted share on several NFS server (inc. Lin 2.6.16.28, FreeBSD 6.1
  etc).

- when two or more clients try to write/append to the same file on NFS
  share this file contains all the data writen + some blocks are padded
  with zeros.

- I used this test script:

  #!/bin/sh

  while true; do
      cat /tmp/data >>/pub/tmp/zeros.log
      usleep 1000;
  done

- /pub is the NFS share from Lin 2.6.16.28 server
- resulting zeros.log is included

Expect it may be related to this:

http://www.ussg.iu.edu/hypermail/linux/kernel/0604.3/1469.html
([PATCH INTRO] Re: [RFC] copy_from_user races with readpage)

The same clients running 2.6.16.28 are fine.

Is this known problem (have search vanila and nfs git repos but have not
found anything reasonable) or some new bug?

If you would like more infos please let me know.

(Please CC me as I'm not in the lists.)

Regards

--   

  Tomas Kasparek, PhD student  E-mail: kasparek@fit.vutbr.cz
  CVT FIT VUT Brno, BI/140a    Web:    http://www.fit.vutbr.cz/~kasparek
  Bozetechova 2, 612 66        Fax:    +420 54114-1270
  Brno, Czech Republic         Phone:  +420 54114-1220

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