Ubuntu
lvm2 package

lvm snapshot failed

Bug #122867 reported by Luc Paulin on 2007-06-28

This bug report is a duplicate of: Bug #105936: snapshot creation failure race "in use: not deactivating". Edit Remove

Affects		Status	Importance	Assigned to	Milestone
	lvm2 (Ubuntu)	New	Undecided	Unassigned

Bug Description

Most of the time I try to take a snapshot it failed with the following error message:

lpaulin@datastorb:~$ sudo lvcreate -L50G -s -n snap1 /dev/vg1/rsnapshot -v
File descriptor 5 left open
    Setting chunksize to 16 sectors.
    Finding volume group "vg1"
    Archiving volume group "vg1" metadata (seqno 34).
    Creating logical volume snap1
    Creating volume group backup "/etc/lvm/backup/vg1" (seqno 35).
    Found volume group "vg1"
    Creating vg1-snap1
    Loading vg1-snap1 table
    Resuming vg1-snap1 (254:2)
    Clearing start of logical volume "snap1"
    Found volume group "vg1"
  LV vg1/snap1 in use: not deactivating
  Couldn't deactivate new snapshot.

System is running feisty with kernel 2.6.20-16-generic
Problem seem to be related to https://bugs.launchpad.net/debian/+bug/38409

Revision history for this message

rfried (rfried) wrote on 2007-08-25:

Hello,

same thing here.

Environment Ubuntu 7.04:
----------------------------------
Linux titan 2.6.20-16-generic #2 SMP Thu Jun 7 20:19:32 UTC 2007 i686 GNU/Linux
ii dmsetup 1.02.08-1ubuntu10 The Linux Kernel Device Mapper userspace library
ii libdevmapper1.02 1.02.08-1ubuntu10 The Linux Kernel Device Mapper userspace library
ii libvolume-id0 108-0ubuntu4 volume identification library
ii lvm2 2.02.06-2ubuntu9 The Linux Logical Volume Manager
ii mdadm 2.5.6-7ubuntu5 tool to administer Linux MD arrays (software RAID)
ii udev 108-0ubuntu4 rule-based device node and kernel event manager
ii volumeid 108-0ubuntu4 volume identification tool

Example:
+ lvcreate -A n -s -n opt_0.backup -L 1G /dev/vgsys/opt
LV vgsys/opt_0.backup in use: not deactivating
Couldn't deactivate new snapshot.
+ sleep 1
+ lvremove -A n -f /dev/vgsys/opt_0.backup
+ lvcreate -A n -s -n opt_0.backup -L 1G /dev/vgsys/opt
=> one second after first lvcreate failed it worked fine

I had same problem with openSuSE 10.1 very often
(see https://bugzilla.novell.com/show_bug.cgi?id=178321),
with Ubuntu it's less often but from time to it also happens.

So I use this workaround in my backup script:
        i=$VGRETRYC
        sleepint=0
        while ! lvcreate -A n -s -n "$snapname" -L 1G "$VGBASE/$lvname"; do
                sleep $((sleepint=sleepint+1))
                lvremove -A n -f "$VGBASE/$snapname"
                let i-- || break
        done
        test $i -lt 0 && return 1

Kind regards,
Roland

Revision history for this message

Rico Sennrich (rico-sennrich) wrote on 2007-12-11:

Thank you for taking the time to report this bug and helping to make Ubuntu better. I'm marking this as a duplicate of bug #105936. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.