Rudder

During a migration on Debian 8 from Rudder 4.0 to Rudder 4.1, at the end of the migration the webapp logs (/var/logs/rudder/webapp/YYYY_mm_dd.stderrout) contains a series of exception about "serializedTags: attribute type undefined":

[2017-03-28 09:44:24] ERROR com.normation.ldap.sdk.RwLDAPConnection - Exception ignored (by configuration) when trying to modify entry 'directiveId=c66410bf-4a74-463e-8172-c584bd5022eb-distributePolicy,activeTechniqueId=distributePolicy,techniqueCategoryId=Rudder Internal,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration'.  Reported exception was: serializedTags: attribute type undefined
com.unboundid.ldap.sdk.LDAPException: serializedTags: attribute type undefined
    at com.unboundid.ldap.sdk.LDAPConnection.modify(LDAPConnection.java:2754)
    at com.normation.ldap.sdk.RwLDAPConnection.$anonfun$modifyAction$3(LDAPConnection.scala:541)
        ...
    at com.normation.rudder.services.policies.SaveDirectivesOnTechniqueCallback.$anonfun$updatedTechniques$2(TechniqueReloadingCallbacks.scala:82)
        ...
    at com.normation.rudder.services.policies.SaveDirectivesOnTechniqueCallback.$anonfun$updatedTechniques$1(TechniqueReloadingCallbacks.scala:78)
        ...
    at com.normation.cfclerk.services.impl.TechniqueRepositoryImpl.$anonfun$update$4(TechniqueRepositoryImpl.scala:116)
    at com.normation.utils.Control$.$anonfun$bestEffort$1(Control.scala:111)
    at scala.collection.immutable.List.foreach(List.scala:378)
    at com.normation.utils.Control$.bestEffort(Control.scala:111)
    at com.normation.cfclerk.services.impl.TechniqueRepositoryImpl.update(TechniqueRepositoryImpl.scala:114)
    at bootstrap.liftweb.checks.CheckTechniqueLibraryReload.checks(CheckTechniqueLibraryReload.scala:78)
...
[2017-03-28 09:44:24] ERROR com.normation.ldap.sdk.RwLDAPConnection - Exception ignored (by configuration) when trying to modify entry 'directiveId=common-root,activeTechniqueId=common,techniqueCategoryId=Rudder Internal,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration'.  Reported exception was: serializedTags: attribute type undefined
com.unboundid.ldap.sdk.LDAPException: serializedTags: attribute type undefined
...[same kind of stactrace] ...
...
[2017-03-28 09:44:24] ERROR com.normation.ldap.sdk.RwLDAPConnection - Exception ignored (by configuration) when trying to modify entry 'directiveId=inventory-all,activeTechniqueId=inventory,techniqueCategoryId=Rudder Internal,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration'.  Reported exception was: serializedTags: attribute type undefined
com.unboundid.ldap.sdk.LDAPException: serializedTags: attribute type undefined
...[same kind of stactrace] ...
...
[2017-03-28 09:44:24] ERROR com.normation.ldap.sdk.RwLDAPConnection - Exception ignored (by configuration) when trying to modify entry 'directiveId=server-roles-directive,activeTechniqueId=server-roles,techniqueCategoryId=Rudder Internal,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration'.  Reported exception was: serializedTags: attribute type undefined
com.unboundid.ldap.sdk.LDAPException: serializedTags: attribute type undefined
...[same kind of stactrace] ...
...
[2017-03-28 09:44:24] ERROR com.normation.ldap.sdk.RwLDAPConnection - Exception ignored (by configuration) when trying to modify entry 'directiveId=common-c66410bf-4a74-463e-8172-c584bd5022eb,activeTechniqueId=common,techniqueCategoryId=Rudder Internal,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration'.  Reported exception was: serializedTags: attribute type undefined
com.unboundid.ldap.sdk.LDAPException: serializedTags: attribute type undefined
...[same kind of stactrace] ...
...
[2017-03-28 09:44:25] ERROR com.normation.ldap.sdk.RwLDAPConnection - Exception ignored (by configuration) when trying to modify entry 'directiveId=root-distributePolicy,activeTechniqueId=distributePolicy,techniqueCategoryId=Rudder Internal,techniqueCategoryId=Active Techniques,ou=Rudder,cn=rudder-configuration'.  Reported exception was: serializedTags: attribute type undefined
com.unboundid.ldap.sdk.LDAPException: serializedTags: attribute type undefined
...[same kind of stactrace] ...

Appart from the presence of the stack trace, nothing seems to be broken.