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.
In particular, due to a typo, both udev and devicemapper were attempting
to create the /dev/mapper device node. This has been corrected so that
only udev does this, and devicemapper waits, as was originally intended.
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.
** Changed in: lvm2 (Ubuntu)
Status: In Progress => Fix Released
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creation of snapshots fails unpredictably
https://bugs.launchpad.net/bugs/38409
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