unshare -m does not work as expected

[Kevin Wilson]

I am trying this simple sequence:

unshare -m /bin/bash
mount /dev/sd3 /mnt/sda3

then from a different terminal I run:
mount | grep sda2

And I see this mount (which was not mounted before running this mount command)
cat /proc/self/mountinfo | grep share (on the second terminal, and
also on  the first) does not find anything.
So we don't have here a shared mount.

Now, I would expect not to see sda3 mounted on the second terminal.
I created a child with a different namespace in the first terminal.

Why do I see it ?


regards,
Kevin