Here is an output of the commands iv'e used:
root@rmc0078140:~# lvcreate -L 1G -n test system
Logical volume "test" already exists in volume group "system"
root@rmc0078140:~# lvcreate -L 1G -n test2 system
Logical volume "test2" created
root@rmc0078140:~# mkfs.ext4 /dev/system/test
mke2fs 1.42.9 (4-Feb-2014)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
65536 inodes, 262144 blocks
13107 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
root@rmc0078140:~# mkfs.ext4 /dev/system/test2
mke2fs 1.42.9 (4-Feb-2014)
Filesystem label=
OS type: Linux
Block size=4096 (log=2)
Fragment size=4096 (log=2)
Stride=0 blocks, Stripe width=0 blocks
65536 inodes, 262144 blocks
13107 blocks (5.00%) reserved for the super user
First data block=0
Maximum filesystem blocks=268435456
8 block groups
32768 blocks per group, 32768 fragments per group
8192 inodes per group
Superblock backups stored on blocks:
32768, 98304, 163840, 229376
Allocating group tables: done
Writing inode tables: done
Creating journal (8192 blocks): done
Writing superblocks and filesystem accounting information: done
root@rmc0078140:~# mount /dev/system/test /mnt/
root@rmc0078140:~# mkdir /mnt/test2
root@rmc0078140:~# mount /dev/system/test2 /mnt/test2/
root@rmc0078140:~# ln -sf /etc/issue /mnt/
root@rmc0078140:~# umount /mnt/*
umount: /mnt/issue: not mounted
umount: /mnt/lost+found: not mounted
root@rmc0078140:~# umount /mnt/
umount: /mnt: device is busy.
(In some cases useful info about processes that use
the device is found by lsof(8) or fuser(1))
root@rmc0078140:~# lvremove -f /dev/system/test2
/dev/mapper/sda5_crypt: BLKDISCARD ioctl at offset 115034030080 size
1073741824 failed: Operation not supported.
Logical volume "test2" successfully removed
root@rmc0078140:~# lvremove -f /dev/system/test
Logical volume system/test contains a filesystem in use.
but i looks like after an update the problem is gone. i guess it is
kernel related?
root@rmc0078140:~# uname -a
Linux rmc0078140 3.13.0-27-generic #50-Ubuntu SMP Thu May 15 18:06:16 UTC 2014
x86_64 x86_64 x86_64 GNU/Linux
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https://bugs.launchpad.net/bugs/1358310
Title:
using umount with bash wildcard ends in "device is busy" for mount of
parent directory
Status in “util-linux” package in Ubuntu:
Incomplete
Bug description:
hi,
i've run into a problem on ubuntu 14.04 while mounting an ganeti
instance for doing some chroot stuff. but the problem itself not
related to ganeti or any other virtualization. its just a problem
while mounting/unmounting some devices.
so heres an example how to reproduce the problem:
lvcreate -L 1G -n test system
lvcreate -L 1G -n test2 system
mkfs.ext4 /dev/system/test
mkfs.ext4 /dev/system/test2
mount /dev/system/test /mnt/
mkdir /mnt/test2
mount /dev/system/test2 /mnt/test2/
ln -sf /etc/issue /mnt/
umount /mnt/*
umount /mnt/
lvremove -f /dev/system/test2
lvremove -f /dev/system/test
if i run this commands /mnt/ is still mounted and it is only possible
to umount it using "-l" switch. but after this it is still not
possible to remove the logical volume because it says "Logical volume
system/test contains a filesystem in use."
if i run the same commands but without the "ln -sf /etc/issue /mnt/"
everything is okay. also if i replace "umount /mnt/*" with "umount
/mnt/boot" everything works.
so it seems like umount ist opening /etc/issue for some reason if a
bash wildcard is used and not releasing it. checking with lsof or
fuser does not show any open files under /mnt/ nor for /etc/issue.
the problem does not exist with ubuntu 12.04.
a solution for this problem would be great because if you often do
some chroot stuff it is easier to use "umount /mnt/*" to umount all
bind mounts like /proc/ or /sys/ than running a umount command for
each mount.
also i havent found a way, other than reboot, to remove an open
logical volume if it was hit by this problem.
lsb_release -rd
Description: Ubuntu 14.04.1 LTS
Release: 14.04
regards
the2nd
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