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Bug 244215

Summary:	kernel dm snapshot: activating of snapshot marked invalid causes incorrect mapping
Product:	Red Hat Enterprise Linux 5	Reporter:	Milan Broz <mbroz>
Component:	kernel	Assignee:	Milan Broz <mbroz>
Status:	CLOSED ERRATA	QA Contact:	Martin Jenner <mjenner>
Severity:	medium	Docs Contact:
Priority:	medium
Version:	5.0	CC:	agk, bleanhar, k.georgiou, pvrabec, rkenna, sven
Target Milestone:	---
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	RHBA-2007-0959	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2007-11-07 19:53:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:

Description Milan Broz 2007-06-14 15:33:44 UTC

+++ This bug was initially created as a clone of Bug #244214 +++
RHEL5 clone

Activation of volume group with overfilled snapshot (snapshot marked invalid in
metadata) causes incorrect mapping and causing userspace tools fails.

device-mapper: snapshot is marked invalid
device-mapper: Failed to read snapshot metadata
device-mapper: error adding target to table
  device-mapper: reload ioctl failed: Invalid argument


Snapshot should be "activated" normally but marked invalid only.

Also the mapping table for snapshot in kernel is then incorrect.

Reproducer script:
DEV=/dev/sdb1
VG=vg_test
LV=lv_test

pvcreate $DEV
vgcreate $VG $DEV
lvcreate -L 100M -n $LV $VG
lvcreate -s -L 4M -n "$LV"_snap $VG/$LV

#overfill snapshot
dd if=/dev/zero of=/dev/$VG/$LV bs=5M count=1
sync

vgchange -a n $VG

#activate VG with invalid snapshot
vgchange -a y $VG

#cleaning
vgchange -a n $VG
lvremove $VG/"$LV"_snap
lvremove $VG/"$LV"
vgremove $VG
pvremove $DEV

Comment 2 RHEL Program Management 2007-06-14 16:54:00 UTC

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux maintenance release.  Product Management has requested
further review of this request by Red Hat Engineering, for potential
inclusion in a Red Hat Enterprise Linux Update release for currently deployed
products.  This request is not yet committed for inclusion in an Update
release.

Comment 5 Don Zickus 2007-07-10 16:19:04 UTC

in 2.6.18-33.el5
You can download this test kernel from http://people.redhat.com/dzickus/el5

Comment 7 Milan Broz 2007-07-30 08:48:23 UTC

*** Bug 243130 has been marked as a duplicate of this bug. ***

Comment 8 Milan Broz 2007-09-13 16:46:21 UTC

*** Bug 251326 has been marked as a duplicate of this bug. ***

Comment 10 errata-xmlrpc 2007-11-07 19:53:16 UTC

An advisory has been issued which should help the problem
described in this bug report. This report is therefore being
closed with a resolution of ERRATA. For more information
on the solution and/or where to find the updated files,
please follow the link below. You may reopen this bug report
if the solution does not work for you.

http://rhn.redhat.com/errata/RHBA-2007-0959.html