This bug has been copied from bug #557423 and has been proposed to be backported to 5.5 z-stream (EUS).
in 2.6.18-194.5.1.el5
Technical note added. If any revisions are required, please edit the "Technical Notes" field accordingly. All revisions will be proofread by the Engineering Content Services team. New Contents: On NFS, the read(2) system call could have returned an unexpected EIO (input/ouput error) value.
An advisory has been issued which should help the problem described in this bug report. This report is therefore being closed with a resolution of ERRATA. For more information on therefore solution and/or where to find the updated files, please follow the link below. You may reopen this bug report if the solution does not work for you. http://rhn.redhat.com/errata/RHSA-2010-0504.html