Bug 969514

Summary:	dmeventd fails to auto extend snapshot after some time
Product:	Red Hat Enterprise Linux 6	Reporter:	Bassu <akhan>
Component:	lvm2	Assignee:	LVM and device-mapper development team <lvm-team>
Status:	CLOSED NEXTRELEASE	QA Contact:	Cluster QE <mspqa-list>
Severity:	unspecified	Docs Contact:
Priority:	unspecified
Version:	6.4	CC:	agk, dwysocha, heinzm, jbrassow, msnitzer, prajnoha, prockai, thornber, zkabelac
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:		Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2013-10-09 23:53:08 UTC	Type:	Bug
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Bassu 2013-05-31 16:12:04 UTC

Description of problem:
dmeventd fails to auto extend snapshot after 5th time

Version-Release number of selected component (if applicable):
lvm2-2.02.98-9.el6.x86_64
device-mapper-event-1.02.77-9.el6.x86_64

Actual results:
May 31 05:45:03 snotty lvm[6813]: Monitoring snapshot vgsnotty-snappain
May 31 05:53:34 snotty lvm[6813]: Extending logical volume snappain to 4.50 GiB
May 31 05:53:35 snotty lvm[6813]: Monitoring snapshot vgsnotty-snappain
May 31 05:53:35 snotty lvm[6813]: Logical volume snappain successfully resized
May 31 05:53:37 snotty lvm[6813]: No longer monitoring snapshot vgsnotty-snappain
May 31 05:59:05 snotty lvm[6813]: Extending logical volume snappain to 6.75 GiB
May 31 05:59:05 snotty lvm[6813]: Monitoring snapshot vgsnotty-snappain
May 31 05:59:05 snotty lvm[6813]: Logical volume snappain successfully resized
May 31 05:59:07 snotty lvm[6813]: No longer monitoring snapshot vgsnotty-snappain
May 31 06:08:15 snotty lvm[6813]: Extending logical volume snappain to 10.12 GiB
May 31 06:08:15 snotty lvm[6813]: Monitoring snapshot vgsnotty-snappain
May 31 06:08:15 snotty lvm[6813]: Logical volume snappain successfully resized
May 31 06:08:17 snotty lvm[6813]: No longer monitoring snapshot vgsnotty-snappain
May 31 06:22:25 snotty lvm[6813]: Extending logical volume snappain to 15.19 GiB
May 31 06:22:26 snotty lvm[6813]: Monitoring snapshot vgsnotty-snappain
May 31 06:22:27 snotty lvm[6813]: Logical volume snappain successfully resized
May 31 06:22:29 snotty lvm[6813]: No longer monitoring snapshot vgsnotty-snappain
May 31 07:08:36 snotty lvm[6813]: Extending logical volume snappain to 22.78 GiB
May 31 07:08:37 snotty lvm[6813]: Monitoring snapshot vgsnotty-snappain
May 31 07:08:40 snotty lvm[6813]: Logical volume snappain successfully resized
May 31 07:08:41 snotty lvm[6813]: No longer monitoring snapshot vgsnotty-snappain
May 31 08:45:26 snotty lvm[6813]: No longer monitoring snapshot vgsnotty-snappain
May 31 08:45:26 snotty lvm[6813]: Monitoring snapshot vgsnotty-snappain
May 31 08:56:56 snotty kernel: device-mapper: snapshots: Invalidating snapshot: Unable to allocate exception.
May 31 08:56:56 snotty kernel: quiet_error: 56 callbacks suppressed
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120053
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120054
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120055
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120056
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120057
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120058
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120059
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120060
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120061
May 31 08:56:56 snotty kernel: Buffer I/O error on device dm-25, logical block 102120062
May 31 09:00:48 snotty lvm[6813]: No longer monitoring snapshot vgsnotty-snappain

Expected results:
There should have been another expansion after 22.7GB

Comment 2 Zdenek Kabelac 2013-06-05 15:16:17 UTC

Please attach 'lvs -a'  which is grabbed during the lifetime of snapshot.

There was a bug (fixed upstream) - where 100% full snapshot has been skipped from futher resize (although it's still valid snapshot - that would possibly explain what you can see).

Comment 3 Alasdair Kergon 2013-10-09 23:53:08 UTC

Closing.  We believe this has been fixed upstream (and therefore in RHEL6.5).

If that's not the case please just reopen this.