[buildd-tools-devel] Bug#592250: Bug#592250: schroot: LVM snapshots not fully cleaned up
James Vega
jamessan at debian.org
Tue Aug 10 23:56:56 UTC 2010
On Tue, Aug 10, 2010 at 12:09:42PM +0100, Roger Leigh wrote:
> On Sun, Aug 08, 2010 at 01:08:57PM -0400, James Vega wrote:
> > Package: schroot
> > Version: 1.4.7-1
> > Severity: normal
> >
> > As the attached typescript should show, when schroot is finished running
> > commands in an LVM snapshot chroot, the snapshot is not properly torn
> > down. This leads to an accumulation of active snapshots.
>
> > I: Executing ‘05lvm setup-start ok’
> > E: 05lvm: Setting chunksize to 8 sectors.
> > E: 05lvm: Setting logging type to disk
> > E: 05lvm: Finding volume group "debil0"
> > E: 05lvm: Archiving volume group "debil0" metadata (seqno 1378).
> > E: 05lvm: Creating logical volume sid-1bb5a5c0-6fe6-4c52-ae4c-31d39cdb48df
> > E: 05lvm: Creating volume group backup "/etc/lvm/backup/debil0" (seqno 1379).
> > E: 05lvm: Found volume group "debil0"
> > E: 05lvm: Creating debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df
> > E: 05lvm: Loading debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df table (254:9)
> > E: 05lvm: Resuming debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df (254:9)
> > E: 05lvm: Clearing start of logical volume "sid-1bb5a5c0-6fe6-4c52-ae4c-31d39cdb48df"
> > E: 05lvm: Creating logical volume snapshot1
> > E: 05lvm: Found volume group "debil0"
> > E: 05lvm: Found volume group "debil0"
> > E: 05lvm: Loading debil0-schroot-real table (254:6)
> > E: 05lvm: Suppressed debil0-schroot-real identical table reload.
> > E: 05lvm: Loading debil0-schroot table (254:5)
> > E: 05lvm: Suppressed debil0-schroot identical table reload.
> > E: 05lvm: Loading debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59-cow table (254:7)
> > E: 05lvm: Suppressed debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59-cow identical table reload.
> > E: 05lvm: Loading debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59 table (254:4)
> > E: 05lvm: Suppressed debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59 identical table reload.
> > E: 05lvm: Creating debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df-cow
> > E: 05lvm: Loading debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df-cow table (254:10)
> > E: 05lvm: Resuming debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df-cow (254:10)
> > E: 05lvm: Loading debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df table (254:9)
> > E: 05lvm: Suspending debil0-schroot (254:5) with filesystem sync with device flush
> > E: 05lvm: Suspending debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59 (254:4) with filesystem sync with device flush
> > E: 05lvm: Suspending debil0-schroot-real (254:6) with filesystem sync with device flush
> > E: 05lvm: Suspending debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59-cow (254:7) with filesystem sync with device flush
> > E: 05lvm: Found volume group "debil0"
> > E: 05lvm: Loading debil0-schroot-real table (254:6)
> > E: 05lvm: Suppressed debil0-schroot-real identical table reload.
> > E: 05lvm: Loading debil0-schroot table (254:5)
> > E: 05lvm: Suppressed debil0-schroot identical table reload.
> > E: 05lvm: Loading debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59-cow table (254:7)
> > E: 05lvm: Suppressed debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59-cow identical table reload.
> > E: 05lvm: Loading debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59 table (254:4)
> > E: 05lvm: Suppressed debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59 identical table reload.
> > E: 05lvm: Loading debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df-cow table (254:10)
> > E: 05lvm: Suppressed debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df-cow identical table reload.
> > E: 05lvm: Resuming debil0-schroot-real (254:6)
> > E: 05lvm: Resuming debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59-cow (254:7)
> > E: 05lvm: Resuming debil0-experimental--dd3bfc99--a737--4a75--a1db--68153d95db59 (254:4)
> > E: 05lvm: Resuming debil0-sid--1bb5a5c0--6fe6--4c52--ae4c--31d39cdb48df (254:9)
> > E: 05lvm: Resuming debil0-schroot (254:5)
> > E: 05lvm: Creating volume group backup "/etc/lvm/backup/debil0" (seqno 1380).
> > I: 05lvm: Logical volume "sid-1bb5a5c0-6fe6-4c52-ae4c-31d39cdb48df" created
>
>
> > I: Executing ‘05lvm setup-stop ok’
> > I: 05lvm: Removing device lock for /dev/debil0/sid-1bb5a5c0-6fe6-4c52-ae4c-31d39cdb48df, owned by pid 31620
> > E: 05lvm: Using logical volume(s) on command line
> > E: 05lvm: Can't remove open logical volume "sid-1bb5a5c0-6fe6-4c52-ae4c-31d39cdb48df"
>
> The question here is why did the lvremove command above fail? What
> happens if you lvremove sid-1bb5a5c0-6fe6-4c52-ae4c-31d39cdb48df
> by hand? Does this still give you the same error?
Sometimes. It seems to be that lvm is waiting for something to release
the volume and that can take an arbitrary amount of time in the
background. Sometimes, issuing lvremove manually after the schroot
session works. Sometimes it doesn't work for a number of minutes, but
it does seem to eventually work. I can force it to work immediately by
manually running «dmsetup remove» on the /dev/mapper entries for the
session first.
> Which kernel version are you running?
ii linux-image-2.6.32-5-686 2.6.32-19
> Some versions do have buggy
> LVM support--I've seen myself some time ago a system which would
> allow snapshot creation but not deletion. IIRC it might also be
> due to the presence of multiple snapshots or snapshots of snapshots--
> you might see this go away if you delete all snapshots in this
> volume group and try again.
Whether or not I have other snapshots active doesn't seem to make a
difference.
--
James
GPG Key: 1024D/61326D40 2003-09-02 James Vega <jamessan at debian.org>
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