[resending to the correct mailing list]

Hi,

as discussed on linux-raid, please fix the bug that udev 215 creates
inactive MD devices upon stopping them.

Reference: http://www.spinics.net/lists/raid/msg46676.html
Reported-by: Francis Moreau <redacted>

An open() call to /dev/mdX after creating it with mknod is enough to
create such inactive MD device.

According to Artur the issue is caused by this change in udev:

commit 3ebdb81ef088afd3b4c72b516beb5610f8c93a0d
Author: Kay Sievers <kay at vrfy.org>
Date:   Sun Apr 13 19:54:27 2014 -0700

     udev: serialize/synchronize block device event handling with file locks

http://cgit.freedesktop.org/systemd/systemd/commit/?id=3ebdb81ef088afd3b4c72b516beb5610f8c93a0d

It seems that they have already disabled this for dm for some reason,
but not for md:

commit e918a1b5a94f270186dca59156354acd2a596494
Author: Kay Sievers [off-list ref]
Date:   Tue Jun 3 16:49:38 2014 +0200

    udev: exclude device-mapper from block device ownership event locking

http://cgit.freedesktop.org/systemd/systemd/commit/?id=e918a1b5a94f270186dca59156354acd2a596494

Thanks,
Sebastian