Hello Theodore, please excuse the late reply, I was on business travel. On Sun, Nov 09, 2014 at 08:19:19PM -0500, Theodore Ts'o wrote: > On Sun, Nov 09, 2014 at 10:30:25PM +0100, Helge Kreutzmann wrote: > > > > Thanks for the explanation, but would there be a way to figure out > > this second process? I tried fuser and lsopen, both to no avail (but > > I've might have missed the right set of options, of course). > > Is there any chance that you might be using mount namespaces or bind > mounts? Are you using LXC, or something like schroot which might be > doing this on your behalf without knowing it? If so, it might be that > although you *think* you've unmounted the file system, but in fact > it's still mounted. Try checking /proc/fs/ext4 and see if you see the > device-mapper node corresponding to /dev/system_vg/video_lv. If it's > there, then you probably have some mount namespace where the file > system is mounted.
None that I know of. I use LVM, but neither namespace nor bind bounds,
LXC is not installed and schroot currently not configured on this
machine.
I don't have »/proc/fs/ext4«. (But then I don't use ext4, the
partition in question uses ext3).
> Unfortunately depending on which namespaces are in use, trying to
> figure out what still has the file system mounted can be a bit of a
> mess. If you're not using pid namespaces, you coulld look at
> /proc/<pid>/mounts for every single pid in the system, and see if one
> or more processes has a /proc/<pid>/mounts file that has the file
> system mounted.
Ok, this seems to point to something:
find /proc/ -name mounts -exec cat "{}" ";" | grep video
finds two entries.
Ok, the first one is:
/sbin/cgmanager --daemon -m name=systemd
(However, I don't use systemd on this machine, it does not really work
on this machine, and having it installed partially (though not as PID
1) caused only trouble; unfortunately sometimes hard depencendcies
require it, but I disgress).
The other entry points to the same programm, (/proc/2721/mounts and
/proc/2721/task/2721/mounts).
Now I removed cgmanager:
And e2fsck works again!
First of all, thanks for helping, I did not know about the trick with
/proc.
Secondly should this bug be assigned to cgmanager?
(And probably a wishlist bug for the kernel to offer a reliable means
to detect mounted partitions?).
Thanks again!
Greetings
Helge
--
Dr. Helge Kreutzmann [email protected]
Dipl.-Phys. http://www.helgefjell.de/debian.php
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