Note: This bug is displayed in read-only format because the product is no longer active in Red Hat Bugzilla.

RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.

Bug 1044154

Summary:	multi master replication allows schema violation
Product:	Red Hat Enterprise Linux 7	Reporter:	Nathan Kinder <nkinder>
Component:	389-ds-base	Assignee:	Rich Megginson <rmeggins>
Status:	CLOSED ERRATA	QA Contact:	Viktor Ashirov <vashirov>
Severity:	unspecified	Docs Contact:
Priority:	medium
Version:	7.0	CC:	lkrispen, nhosoi, vashirov
Target Milestone:	rc
Target Release:	---
Hardware:	Unspecified
OS:	Unspecified
Whiteboard:
Fixed In Version:	389-ds-base-1.3.3.1-1.el7	Doc Type:	Bug Fix
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2015-03-05 09:31:45 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 Nathan Kinder 2013-12-17 21:31:14 UTC

This bug is created as a clone of upstream ticket:
https://fedorahosted.org/389/ticket/601

If an attribute is required by the schema any attempt to delete all values will fail without replication or on a single master.
But if the attribute has two values it is possible to simultaneously delete one value on one master and the other value on the other master - the individual operation is allowed as one value remains. After the two masters have replayed their changes to each other bot values have disappeared.

Comment 2 Viktor Ashirov 2014-12-10 23:31:28 UTC

$ rpm -qa  | grep 389
389-ds-base-1.3.3.1-9.el7.x86_64
389-ds-base-debuginfo-1.3.3.1-9.el7.x86_64
389-ds-base-libs-1.3.3.1-9.el7.x86_64

I can reproduce the problem. 
I set up MMR (M1 - 1189, M2 - 1289)

[1] Add test entry
$ ldapmodify -D "cn=Directory Manager" -w Secret123  -H ldap://localhost:1189 -a << EOF
dn: cn=user,ou=People,dc=example,dc=com
objectClass: inetUser
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
cn: user
sn: user-M1
sn: user-M2
EOF
adding new entry "cn=user,ou=People,dc=example,dc=com"

[2] Check that it was synchronized 
$ ldapsearch -h rhel7ds.brq.redhat.com -p 1189 -D "cn=Directory Manager" -w "Secret123" -b "dc=example,dc=com"  "(cn=user)" sn -LLL
dn: cn=user,ou=People,dc=example,dc=com
sn: user-M1
sn: user-M2

$ ldapsearch -h rhel7ds.brq.redhat.com -p 1289 -D "cn=Directory Manager" -w "Secret123" -b "dc=example,dc=com"  "(cn=user)" sn -LLL
dn: cn=user,ou=People,dc=example,dc=com
sn: user-M1
sn: user-M2

[3] Stop M2
$ sudo systemctl stop dirsrv@M2

[4] Delete sn on M1
$ ldapmodify -D "cn=Directory Manager" -w Secret123  -H ldap://localhost:1189 << EOF
dn: cn=user,ou=People,dc=example,dc=com
changetype: modify
delete: sn
sn: user-M1
EOF
modifying entry "cn=user,ou=People,dc=example,dc=com"


$ ldapsearch -h rhel7ds.brq.redhat.com -p 1189 -D "cn=Directory Manager" -w "Secret123" -b "dc=example,dc=com"  "(cn=user)" sn -LLL
dn: cn=user,ou=People,dc=example,dc=com
cn: user
sn: user-M2

[5] Stop M1 and start M2
$ sudo systemctl stop dirsrv@M1
$ sudo systemctl start dirsrv@M2

[6] Delete sn on M2
$ ldapmodify -D "cn=Directory Manager" -w Secret123  -H ldap://localhost:1289 << EOF
dn: cn=user,ou=People,dc=example,dc=com
changetype: modify
delete: sn
sn: user-M2
EOF
modifying entry "cn=user,ou=People,dc=example,dc=com"

$ ldapsearch -h rhel7ds.brq.redhat.com -p 1289 -D "cn=Directory Manager" -w "Secret123" -b "dc=example,dc=com"  "(cn=user)" sn -LLL
dn: cn=user,ou=People,dc=example,dc=com
sn: user-M1

[7] Restart both M1 and M2
$ sudo systemctl restart dirsrv.target

[8] sn attribute was removed on both M1 and M2, though it violates the schema
$ ldapsearch -h rhel7ds.brq.redhat.com -p 1189 -D "cn=Directory Manager" -w "Secret123" -b "dc=example,dc=com"  "(cn=user)"  -LLL
dn: cn=user,ou=People,dc=example,dc=com
objectClass: inetUser
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
cn: user

$ ldapsearch -h rhel7ds.brq.redhat.com -p 1289 -D "cn=Directory Manager" -w "Secret123" -b "dc=example,dc=com"  "(cn=user)"  -LLL
dn: cn=user,ou=People,dc=example,dc=com
objectClass: inetUser
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
cn: user

In the errors log: 
[11/Dec/2014:00:07:42 +0100] - Entry "cn=user,ou=People,dc=example,dc=com" missing attribute "sn" required by object class "person"

Comment 3 Ludwig 2014-12-11 16:37:43 UTC

The situation cannot be prevented. The fix consists of detecting this situation and log an error and add a replication conflict attribute: nsds5ReplConflict

So the fix works as expected

Comment 4 Viktor Ashirov 2014-12-11 16:56:13 UTC

Sorry, it wasn't obvious from the description :(

$ ldapsearch -D "cn=Directory Manager" -w Secret123 -h localhost -p 1189 -b "dc=example,dc=com" "nsds5ReplConflict=*" \* nsds5ReplConflict -LLL
dn: cn=user,ou=People,dc=example,dc=com
objectClass: inetUser
objectClass: top
objectClass: person
objectClass: organizationalPerson
objectClass: inetOrgPerson
cn: user
nsds5ReplConflict: Schema violation


nsds5ReplConflict attribute was added on both masters. Marking as VERIFIED.

Comment 6 errata-xmlrpc 2015-03-05 09:31:45 UTC

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHSA-2015-0416.html