I can confirm that this is still an issue in Ubuntu 14.04.4. I ran into
this problem trying to backup a server hosting lxc containers, some of
them using overlayfs as the root fs. When the containers are running
(and therefore overlayfs is mounted) lvcreate -s hangs forever. The
debug output is:
root@host:~# lvcreate -n foobar -L 5G -s -d -v /dev/vg0/var
Setting logging type to disk
Setting chunksize to 8 sectors.
Finding volume group "vg0"
Archiving volume group "vg0" metadata (seqno 5091).
Creating logical volume foobar
Creating volume group backup "/etc/lvm/backup/vg0" (seqno 5092).
Found volume group "vg0"
activation/volume_list configuration setting not defined: Checking only
host tags for vg0/foobar
Creating vg0-foobar
Loading vg0-foobar table (252:5)
Resuming vg0-foobar (252:5)
Clearing start of logical volume "foobar"
Creating logical volume snapshot0
Found volume group "vg0"
Found volume group "vg0"
Executing: /sbin/modprobe dm-snapshot
Creating vg0-var-real
Loading vg0-var-real table (252:6)
Loading vg0-var table (252:3)
Creating vg0-foobar-cow
Loading vg0-foobar-cow table (252:7)
Resuming vg0-foobar-cow (252:7)
Loading vg0-foobar table (252:5)
Suspending vg0-var (252:3) with filesystem sync with device flush
When the containers are stopped (and therefore overlayfs is no longer
mounted), the snapshot is created without issues.
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https://bugs.launchpad.net/bugs/1328595
Title:
lvcreate -s hangs when overlayfs is in use
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