1. Stop all middle tier services including the concurrent managers.
Please make sure that no FNDLIBR, FNDSM, or any dead process is running.

2. Stop the database.

3. Start the database.

4. Go to cd $FND_TOP/bin
$ adrelink.sh force=y "fnd FNDLIBR"
$ adrelink.sh force=y "fnd FNDFS"
$ adrelink.sh force=y "fnd FNDCRM"
$ adrelink.sh force=y "fnd FNDSM"

5. Run the CMCLEAN.SQL script. from the referenced note below (don't forget to commit).
Article- ID : 134007.1
Title: CMCLEAN.SQL - Non Destructive Script. to Clean Concurrent Manager Tables

6. Execute the following SQL:
select CONCURRENT_QUEUE_NAME from FND_CONCURRENT_QUEUES where CONCURRENT_QUEUE_NAME like 'FNDSM%';

7. Start the middle tier services including your concurrent manager.