[Bug 585027] Re: Race condition with dmsetup causes 'map already present' messages

[Peter Petrakis]

So when this bug was first reported we were using multipath 0.4.8, it doesn't appear
to have this cookie mechanism. 0.4.9 does (oneiric and higher); I have been
unable to reproduce the issue with 0.4.9. Going back through the logs...

"""
>From 8d63b33d0996e141a2451df552b062b908db15bc Mon Sep 17 00:00:00 2001
From: Benjamin Marzinski <bmarzins at redhat.com>
Date: Mon, 17 May 2010 14:03:38 -0500
Subject: [PATCH] multipath: add udev sync support.

device-mapper in now able to synchronize operations through udev.  This patch
allows multipath and kpartx to make use of this feature. If kpartx is run with
"-s", it waits for the partitions to be created before returning. Multipath
will now always wait for the devices to be created before returning.

This feature requires dm_task_set_cookie() which was finalized in device-mapper
version 1.2.38
"""
Appears to be where cookie support was initially added. I'll retest with 0.4.8 to
verify that the fault still exists (probably) and take it from there.

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Title:
  Race condition with dmsetup causes 'map already present' messages

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