I can confirm this happens on feisty AMD64.

Linux db-1-snapshot 2.6.20-16-server #2 SMP Wed May 23 00:36:09 UTC 2007
x86_64 GNU/Linux

db-1-snapshot - error creating snapshot lvcreate:    Setting chunksize to 16 
sectors.
    Finding volume group "vg_san_mysql"
    Archiving volume group "vg_san_mysql" metadata (seqno 132).
    Creating logical volume 28517.1181234430.905286
    Creating volume group backup "/etc/lvm/backup/vg_san_mysql" (seqno 133).
    Found volume group "vg_san_mysql"
    Creating vg_san_mysql-28517.1181234430.905286
    Loading vg_san_mysql-28517.1181234430.905286 table
    Resuming vg_san_mysql-28517.1181234430.905286 (254:13)
    Clearing start of logical volume "28517.1181234430.905286"
    Found volume group "vg_san_mysql"
  LV vg_san_mysql/28517.1181234430.905286 in use: not deactivating
  Couldn't deactivate new snapshot.

This is a fairly serious issue for us, since it happens 4-5 times a day.
These snapshots are created programmatically as part of a script... so
when the snapshot creation fails... it's not like I can just re-run the
snapshot create.

I can be on IRC to help anybody debug this issue.  Just let me know when
to be online.  I am in the US/Eastern timezone.

-- 
snapshot creation failure race "in use: not deactivating"
https://bugs.launchpad.net/bugs/105936
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