Error "fileid changed" when accessing files over NFS
The error happened because of wrong fsid value in /etc/exports.
I replaced the second line with this one:
/export/ebs THIRD_SERVER_IP(rw,insecure,no_subtree_check,async) SECOND_SERVER_IP(rw,nohide,insecure,no_subtree_check,async)
and now it works.