"Failed to deactivate device: Device or resource busy" when unmounting LUKS-encrypted partition

[laur89]

When unmounting a LUKS-encrypted partition, either by running udiskie-umount /dev/sdaX or via tray/GUI Unpower /dev/sda command, then following error is shown:

failed to lock /org/freedesktop/UDisks2/block_devices/sda2: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error locking /dev/dm-4 (/dev/sda2): Failed to deactivate device: Device or resource busy

Notification error message is slightly different:

Job Failed
failed to lock /dev/sda2: Threaded job failed with error: Failed to deactivate device: Device or resource busy (g-bd-crypto-error-quark, 1)

Best I can tell no user-launched program is accessing the drive.

config ~/.config/udiskie/config.yml:

device_config:
  - id_uuid: 6812a133-4aa1-455a-8ba1-da21ecc4822a
    keyfile: /path/to/key

udiskie 2.5.8

[coldfix]

Hi, did you check lsof /path/to/mountpoint?

[laur89]

Sry, that's what I meant by "best I can tell..." bit.

$ lsof /run/media/laur89/mount
$ echo $?
1

[coldfix]

Oh, right. I believe the job fails, because the device is still mounted and it does not attempt to unmount by default when using the CLI. Does the behaviour improve if you run udiskie-umount -f /dev/sdaX?

[laur89]

Nope, forcing results in the same error, plus a new one:

failed to unmount /org/freedesktop/UDisks2/block_devices/dm_2d4: GDBus.Error:org.freedesktop.UDisks2.Error.Failed: Error unmounting /dev/dm-4: not mounted

Assume it's some formatting error, but note dm_2d4