Cannot unmount ramfs after chmod

From: Pavel Roskin (proski@gnu.org)
Date: Tue Apr 10 2001 - 17:06:58 EST

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Hello!

This happens on RedHat Linux 7.0, i686 with Linux-2.4.3-ac3.
Chmod on the top-level inode of ramfs make it impossible to unmount the
filesystem.

Chmod on other files has no effect.

[root@fonzie /root]# umount t1
[root@fonzie /root]# mount -t ramfs none t1
[root@fonzie /root]# touch t1/foo
[root@fonzie /root]# umount t1
[root@fonzie /root]# mount -t ramfs none t1
[root@fonzie /root]# touch t1/foo
[root@fonzie /root]# chmod 600 t1/foo
[root@fonzie /root]# umount t1
[root@fonzie /root]# mount -t ramfs none t1
[root@fonzie /root]# chmod 600 t1
[root@fonzie /root]# umount t1
umount: /root/t1: device is busy

-- Regards, Pavel Roskin

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