NFSv4 client in RHEL6 gets wrong modify date from NFSv4 server in AIX. NFS exported area is on GPFS on AIX.

Issue

• NFSv4 client in RHEL6 get wrong modify date from NFSv4 server in AIX.
• The sample is below

$ /bin/cp -f /etc/hosts hosts.`date +%s`; ls -l hosts.`date +%s`
-rw-r----- 1 test-user test-group 223575 Sep 17  2068 hosts.1383026670
                                         ^^^ HERE ^^^
$ stat hosts.1383026670
  File: `hosts.1383026670'
  Size: 223575      Blocks: 448        IO Block: 65536  regular file
Device: 15h/21d Inode: 175180      Links: 1
Access: (0644/-rw-r--r--)  Uid: (11111/test-user)   Gid: (11111/test-group)
Access: 2013-10-29 15:04:30.434444271 +0900
Modify: 2068-09-17 01:00:39.657981440 +0900 <----HERE
Change: 2013-10-29 15:04:30.437540718 +0900

• This issue does not occur with RHEL5 NFSv4 client.
• The NFS area is on GPFS.