Comment 87 for bug 75681

Scott James Remnant wrote:
> We believe that this problem has been corrected by a series of uploads
> today. Please update to ensure you have the following package versions:
>
> dmsetup, libdevmapper1.02 - 1.02.08-1ubuntu6
> lvm-common - 1.5.20ubuntu12
> lvm2 - 2.02.06-2ubuntu9
> mdadm - 2.5.6-7ubuntu5 (not applicable unless you're also using mdadm)
> udev, volumeid, libvolume-id0 - 108-0ubuntu1
>
> The problem was caused by a number of ordering issues and race
> conditions relating to when lvm and mdadm were called, and how those
> interacted to ensure the devices were created and their contents
> examined.
>
> This should work as follows:
> * an underlying block device, sda1, is detected
> * udev (through vol_id) detects that this is a RAID member
> * udev invokes mdadm, which fails to assemble because the RAID-1 is not complete
> * the creation of a new raid, md0, is detected
> * udev fails to detect this device, because it is not yet complete
>
> meanwhile:
> * a second underlying block device, sdb1, is detected
> * udev (through vol_id) detects that this is a RAID member
> * udev invokes mdadm, which can now complete since the set is ready
> * the change of the raid array, md0, is detected
> * udev (through vol_id) detects that this is an LVM physical volume
> * lvm is called to handle the creation of the devmapper devices
>
> then
> * various devmapper devices are detected
> * the devices are created by udev, named correctly under /dev/mapper
> * meanwhile the requesting application spins until the device exists, at which point it carries on
> * udev (through vol_id) detects that these devices contain typical filesystems
> * using vol_id it obtains the LABEL and UUID, which is used to populate /dev/disk
>
> Note that this event-based sequence is substantially different from
> Debian, so any bugs filed there will not be relevant to helping solve
> problems in Ubuntu.
>
> This should now work correctly. If it does not, I would ask that you do
> not re-open this bug, and instead file a new bug on lvm2 for your exact
> problem, even if someone else has already filed one, with verbose
> details about your setup and how you cause the error.

The problem persists. Only solution is still to use break=mount option
to boot.

However, I don't use LVM at all, so I don't think I should file a bug on
lvm.

--
Sami Laine @ GMail