I have the following line in /etc/fstab:

none  /home/hydra/tmp  tmpfs  user,noauto,size=1000M,uid=1001,gid=1001  0  0

I can do mount ~/tmp as user hydra and it gets mounted ok. The only problem is that even thought it gets added to /proc/mounts, it does not get added to /etc/mtab. When I try a umount ~/tmp (again as hydra) it complains:

umount: /home/hydra/tmp is not mounted (according to mtab)

And when I try -f or -n, it complains that I am not root.

Some more info on the system that manifests this problem:

On sudo umount /home/hydra/tmp, the fs gets unmounted (I think I needed to used -f too)

• Debian version is testing
• mount --version -> mount from util-linux 2.19.1 (with libblkid and selinux support)
• ls -l /etc/mtab -> -rw-r--r-- 1 root root 921 Nov 14 09:08 /etc/mtab
• cat /proc/mounts | grep rootfs -> rootfs / rootfs rw 0 0
• /home, /home/hydra nor /home/hydra/tmp are symbolic links