<div dir="ltr"><div dir="ltr"><div dir="ltr"><div class="gmail_quote"><div dir="ltr">On Thu, Nov 22, 2018 at 12:39 PM Eberhard Stoll <<a href="mailto:e-stl@gmx.de">e-stl@gmx.de</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">It seems nothing from userspace holds the partitions. Is there a <br>
possibility for a 'hidden' mount or ext4 fs driver occupies the device <br>
nodes?<br></blockquote><div><br></div><div>It could be that they remain mounted within another mount namespace. You don't have any weird udev rules which call `mount`, do you?</div><div><br></div><div>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.</div></div><div><br></div>-- <br><div dir="ltr" class="gmail_signature"><div dir="ltr">Mantas Mikulėnas</div></div></div></div></div>