[Bug 38409] Re: creation of snapshots fails unpredictably

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** Changed in: debian
       Status: New => Fix Released

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https://bugs.launchpad.net/bugs/38409

Title:
  creation of snapshots fails unpredictably

Status in lvm2 package in Ubuntu:
  Fix Released
Status in Debian:
  Fix Released

Bug description:
  Often, lvm snapshots are created sucessfully:

  root at hades:~ # lvcreate -s -n sid_snap /dev/hades_stripe/chroot_sid -L2g -v
      Setting chunksize to 16 sectors.
      Finding volume group "hades_stripe"
      Archiving volume group "hades_stripe" metadata (seqno 200).
      Creating logical volume sid_snap
      Creating volume group backup "/etc/lvm/backup/hades_stripe" (seqno 201).
      Found volume group "hades_stripe"
      Loading hades_stripe-sid_snap
      Zeroing start of logical volume "sid_snap"
      Found volume group "hades_stripe"
      Removing hades_stripe-sid_snap
      Found volume group "hades_stripe"
      Found volume group "hades_stripe"
      Found volume group "hades_stripe"
      Loading hades_stripe-chroot_sid-real
      Loading hades_stripe-sid_snap-cow
      Loading hades_stripe-sid_snap
      Loading hades_stripe-chroot_sid
      Creating volume group backup "/etc/lvm/backup/hades_stripe" (seqno 202).
    Logical volume "sid_snap" created

  Sometimes, however (approx 30% of the time), it fails like this:
  root at hades:~ # lvcreate -s -n sid_snap /dev/hades_stripe/chroot_sid -L2g -v
      Setting chunksize to 16 sectors.
      Finding volume group "hades_stripe"
      Archiving volume group "hades_stripe" metadata (seqno 203).
      Creating logical volume sid_snap
      Creating volume group backup "/etc/lvm/backup/hades_stripe" (seqno 204).
      Found volume group "hades_stripe"
      Loading hades_stripe-sid_snap
      Zeroing start of logical volume "sid_snap"
      Found volume group "hades_stripe"
    LV hades_stripe/sid_snap in use: not removing
    Couldn't deactivate new snapshot.

  It is there, and I need to remove it before recreating it for use:
  root at hades:~ # lvremove /dev/hades_stripe/sid_snap -f
    Logical volume "sid_snap" successfully removed

  then I retry it and often, it succeeds.

  This behaviour completly confuses schroot, which provides chroots on
  lvm snapshots.

  This happens on my dapper/amd64 machine. I wonder why it doesn't on my
  x86 laptop. Perhaps this is arch dependant?

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