[DragonFlyBSD - Bug #742] (Feedback) umount problems with multiple mounts

[bugtracker-admin at leaf.dragonflybsd.org]

Issue #742 has been updated by tuxillo.

Description updated
Category set to Userland
Status changed from New to Feedback
Assignee deleted (0)
Priority changed from High to Normal
Target version set to 3.8.0

Hi,

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

# 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
# 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)
# umount /mnt
unmount(/mnt): Cannot unmount: 3 mount refs still present
umount: unmount of /mnt failed: Device busy
# umount /mnt/var
# umount /mnt/usr
# umount /mnt
# 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


----------------------------------------
Bug #742: umount problems with multiple mounts
http://bugs.dragonflybsd.org/issues/742#change-11720

* Author: corecode
* Status: Feedback
* Priority: Normal
* Assignee: 
* Category: Userland
* Target version: 3.8.0
----------------------------------------
hey,

yes, my fault, but:

%mount 
/dev/ad6s1a on / (ufs, local, soft-updates)
/dev/ad6s1b on /pbulk (ufs, local, soft-updates)
/ on /pbulk/clients/labospc67_1/root (null, local, read-only)
/pbulk/clients/labospc67_1/var on /pbulk/clients/labospc67_1/root/var (null, local)
/pbulk/clients/labospc67_1/tmp on /pbulk/clients/labospc67_1/root/tmp (null, local)
/pbulk/clients/labospc67_1/dev on /pbulk/clients/labospc67_1/root/dev (null, local)
/ on /pbulk/clients/labospc67_1/root (null, local, read-only)

%umount labospc67_1/root
umount: unmount of /pbulk/clients/labospc67_1/root failed: Device busy

%umount /pbulk/clients/labospc67_1/root/var
umount: unmount of /pbulk/clients/labospc67_1/root/var failed: Invalid argument

something is wrong here.  i guess I can't umount the "upper" root mount, because it takes the "lower" root mount first.  dito for the subdirs.

cheers
  simon



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