DragonFlyBSD

Hi,

I've tried to reproduced it with a similar mount setup but all went fine:

1. df -h
   Filesystem Size Used Avail Capacity Mounted on
   /dev/vkd0s1a 2.0G 1.1G 757M 59% /
   devfs 1.0K 1.0K 0B 100% /dev
   procfs 4.0K 4.0K 0B 100% /proc
   / 2.0G 1.1G 757M 59% /mnt
   /var 2.0G 1.1G 757M 59% /mnt/var
   /usr 2.0G 1.1G 757M 59% /mnt/usr
2. mount
   /dev/vkd0s1a on / (ufs, local)
   devfs on /dev (devfs, local)
   procfs on /proc (procfs, local)
   / on /mnt (null, local)
   /var on /mnt/var (null)
   /usr on /mnt/usr (null)
3. umount /mnt
   unmount(/mnt): Cannot unmount: 3 mount refs still present
   umount: unmount of /mnt failed: Device busy
4. umount /mnt/var
5. umount /mnt/usr
6. umount /mnt
7. df -h
   Filesystem Size Used Avail Capacity Mounted on
   /dev/vkd0s1a 2.0G 1.1G 757M 59% /
   devfs 1.0K 1.0K 0B 100% /dev
   procfs 4.0K 4.0K 0B 100% /proc

Cheers,
Antonio Huete

Hi,

corecode pointed out I was missing an additional mount_null / /mnt in my test. After doing that I can reproduce the issue:

1. df -h
   Filesystem Size Used Avail Capacity Mounted on
   /dev/vkd0s1a 2.0G 1.3G 558M 70% /
   devfs 1.0K 1.0K 0B 100% /dev
   procfs 4.0K 4.0K 0B 100% /proc
   / 2.0G 1.3G 558M 70% /mnt
   /var 2.0G 1.3G 558M 70% /mnt/var
   /usr 2.0G 1.3G 558M 70% /mnt/usr
   / 2.0G 1.3G 558M 70% /mnt
2. umount /mnt
   unmount(0x8033214280): Cannot unmount: 2 mount refs still present
   umount: unmount of /mnt failed: Device busy
3. umount /mnt/var/
   umount: unmount of /mnt/var failed: Invalid argument

Assigining this to myself.

Cheers,
Antonio Huete