Bug#618016: lvremove sometimes fails to remove snapshot volumes

[Michael Goetze]

Package: lvm2
Version: 2.02.66-5
Severity: important

I am using LVM snapshots for my backup and I am finding it impossible to
automate their removal. My current code looks like this:

umount /mnt/snap/$LV || exit 3
sleep 1
lvremove -f $VG/$LV-snap
if [ $? -ne 0 ]; then
	sleep 5
	lvremove -f --noudevsync $VG/$LV-snap || exit 2
fi

and it fails regularily, like this:

  Unable to deactivate open vg0-home--snap (254:7)
  Unable to deactivate logical volume "home-snap"
  Unable to deactivate open vg0-home--snap (254:7)
  Unable to deactivate logical volume "home-snap"

I have also tried adding such commands as "sync" or "sleep 60" between
umount and lvremove, none of which helped.

I strongly suspect it is the same bug as reported here:
https://bugzilla.redhat.com/show_bug.cgi?id=577798
which is why I tried the --noudevsync option, to no avail.