From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastian Parschauer <sebastian.riemer@profitbricks.com>
Date: Thu, 24 Jul 2014 14:48:42 +0000
Subject: udev 215 creates inactive MD devices upon stopping them
Message-Id: <53D11CCA.1050602@profitbricks.com>
List-Id: <linux-hotplug.vger.kernel.org>
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To: linux-hotplug@vger.kernel.org
Cc: Linux RAID <linux-raid@vger.kernel.org>, artur.paszkiewicz@intel.com, Francis Moreau <francis.moro@gmail.com>

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 <francis.moro@gmail.com>

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
>=20
>      udev: serialize/synchronize block device event handling with file lo=
cks
>=20
> http://cgit.freedesktop.org/systemd/systemd/commit/?id>bdb81ef088afd3b4c7=
2b516beb5610f8c93a0d
>=20
> It seems that they have already disabled this for dm for some reason,
> but not for md:
>=20
> commit e918a1b5a94f270186dca59156354acd2a596494
> Author: Kay Sievers <kay@vrfy.org>
> Date:   Tue Jun 3 16:49:38 2014 +0200
>=20
>     udev: exclude device-mapper from block device ownership event locking
>=20
> http://cgit.freedesktop.org/systemd/systemd/commit/?id=E918a1b5a94f270186=
dca59156354acd2a596494
>=20

Thanks,
Sebastian

From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sebastian Parschauer <sebastian.riemer@profitbricks.com>
Subject: udev 215 creates inactive MD devices upon stopping them
Date: Thu, 24 Jul 2014 16:48:42 +0200
Message-ID: <53D11CCA.1050602@profitbricks.com>
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Return-path: <linux-hotplug-owner@vger.kernel.org>
Sender: linux-hotplug-owner@vger.kernel.org
To: linux-hotplug@vger.kernel.org
Cc: Linux RAID <linux-raid@vger.kernel.org>, artur.paszkiewicz@intel.com, Francis Moreau <francis.moro@gmail.com>
List-Id: linux-raid.ids

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 <francis.moro@gmail.com>

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 <kay@vrfy.org>
> 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