求助：tar命令报错out of off_t range

Gubuntu

用下面的命令将一个增量备份包写到磁带时报错了：
gtar rPf /dev/rmt/0 /export/home/backup/inc-20120111050516.tar
gtar: value 25016748544 out of off_t range 0..8589934591
gtar: Error exit delayed from previous errors
exitcode=2:

gtar的版本是：
# /usr/sfw/bin/gtar --version
tar (GNU tar) 1.17
Copyright (C) 2007 Free Software Foundation, Inc.
License GPLv2+: GNU GPL version 2 or later <http://gnu.org/licenses/gpl.html>
This is free software: you are free to change and redistribute it.
There is NO WARRANTY, to the extent permitted by law.

Written by John Gilmore and Jay Fenlason.


Google说是gtar的bug？不知道是不是这样，哪位也遇到过这样问题吗？该怎么解决啊？