IdM/IPA CleanAllRUV task does not progress, abort-clean-ruv fails with error "Server is unwilling to perform"

Solution In Progress - Updated -

Issue

In the context of IdM/IPA, one or more CleanAllRUV tasks do not seem to be making any progress.
An attempt to abort a cleanruv task fails:

ipa-replica-manage abort-clean-ruv 60
Aborting the clean Replication Update Vector task for ipaserver2.example.com:389

unexpected error: Server is unwilling to perform: Replica id (60) is not being cleaned, nothing to abort. arguments: entry=cn=abort 60,cn=abort cleanallruv,cn=tasks,cn=config: [('objectclass', ['top', 'extensibleObject']), ('replica-id', [60]), ('cn', ['abort 60']), ('replica-base-dn', [ipapython.dn.DN('dc=example,dc=com')])]`

Adding more CleanAllRUV tasks fails with error:

unexpected error: Server is unwilling to perform: Replica id (60) is not being cleaned, nothing to abort.
[10/Feb/2014:11:35:40 -0800] NSMMReplicationPlugin - CleanAllRUV Task: Exceeded maximum number of active CLEANALLRUV tasks(4)

Several CleanAllRUV tasks may have completed, but are never removed.
It looks like several CleanAllRUV tasks may have completed, but are never removed, or stuck.

Environment

Red Hat Enterprise Linux 6
with

ipa-server 3.0.0-26.el6_4.4
389-ds-base-1.2.11.15-20.el6_4.x86_64

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