If MountFlags=slave, systemd-udevd mounts all block device,  such as

'/dev/sda1' '/dev/mmcblk*' , in itself unit namespace. So other namespace,

such as 'root user', has no access to use block device mentioned above.

On 2018年02月23日 08:50, Otavio Salvador wrote:
On Thu, Feb 22, 2018 at 11:15 AM, Hongzhi.Song
<hongzhi.s...@windriver.com> wrote:
MountFlags's default value is shared in systemd-udevd.service. But upstream
sets MountFlags with slave just for keeping mounts done by udev private to
udevd, which causes block device mounted by udev unvisable but being busy for
host. So we revert it to shared to be propagated to host.

Signed-off-by: Hongzhi.Song <hongzhi.s...@windriver.com>
This is what the mountflag does. This does not explain WHY you need this change.

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