On Thu, Nov 22, 2018 at 12:39 PM Eberhard Stoll <[email protected]> wrote:
> It seems nothing from userspace holds the partitions. Is there a > possibility for a 'hidden' mount or ext4 fs driver occupies the device > nodes? > It could be that they remain mounted within another mount namespace. You don't have any weird udev rules which call `mount`, do you? If you have a recent util-linux, run `sudo lsns -t mnt` to see live namespaces. For each non-kernel process ID in the list, run something like `findmnt -F /proc/$PID/mountinfo` (or `cat` the file). If you don't, then `grep mmcblk1 /proc/*/mountinfo` should do the job as well. -- Mantas Mikulėnas
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