[systemd-devel] systemd[1]: Stopped (with error) /dev/mapper/wxyz.

[Dave T]

I have a fileserver with several HDDs (btrfs and dm-crypt for all except
one which is lvm2 and dm-crypt).

Within the last week when I umount a USB drive, all my other mounts
immediately get unmounted too. I lose /home and almost everything else
except the system device. The USB drive is the ESP (EFI system partition)
mounted at /boot. It is intended to be unmounted after boot and it worked
appropriately until the last week.

If I reboot, all is fine until I umount the USB device (ESP).

I have *not* tried to reproduce the behavior by umounting other devices as
this is a live fileserver. However, I can trigger this behavior 100% of the
time if I umount /boot.

journalctl shows a number of messages similar to this:

    Jul 24 20:25:41 myserver systemd[1]: Stopped (with error)
/dev/mapper/wxyz.
    -- Subject: Unit dev-mapper-wxyz.device has finished shutting down
    -- Defined-By: systemd
    -- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
    --
    -- Unit dev-mapper-wxyz.device has finished shutting down.

As I said, the system has started, in the last week, unmounting all these
other devices. Why?

I am not a developer and I am new to systemd. I am happy to provide
additional information upon request.
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