##########################
                                                                                V1-V3)
backup_abc.log
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT > RMAN-06005: connected to target database: QMCRMDBP (DBID=1706730871)
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT > RMAN-06008: connected to recovery catalog database
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT > 2>
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT >
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT > 19>
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT >
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT > 20>
2013-01-07 02:43:19 +0100( 22310. 0) SESSION  OUT > 23>
2013-01-07 02:48:16 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 02:53:31 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 02:58:46 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:04:01 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:09:16 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:14:31 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:19:46 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:25:01 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:30:15 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:35:30 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:40:45 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:46:00 +0100( 22310. 0) SESSION  OUT > RMAN-08512: waiting for snapshot control file enqueue
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > RMAN-20029: cannot make a snapshot control file
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > RMAN-00571: ===========================================================
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > RMAN-00571: ===========================================================
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > RMAN-03002: failure of configure command at 01/07/2013 03:46:21
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > RMAN-03014: implicit resync of recovery catalog failed
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > RMAN-03009: failure of full resync command on default channel at 01/07/2013 03:46:21
2013-01-07 03:46:21 +0100( 22310. 0) SESSION  OUT > ORA-00230: operation disallowed: snapshot control file enqueue unavailable

#######################

Solution:

SQL> SELECT vs.sid, vs.username, vs.program, vs.module, TO_CHAR(vs.logon_time, 'DD-MON-YYYY HH24:MI:SS')
FROM v$session vs, v$enqueue_lock vel
WHERE vs.sid = vel.sid AND vel.type = 'CF' AND vel.id1 = 0 AND vel.id2 = 2
  2    3    4
SQL> /
          SID USERNAME                       PROGRAM              MODULE                         TO_CHAR(VS.LOGON_TIME,'DD-MON
---------- ------------------------------ -------------------- ------------------------------ -----------------------------
        24 SYS                            rman@s96qmcr0d0 (TNS backup full datafile           24-NOV-2012 06:27:36
                                           V1-V3)


SQL> select SID,SERIAL#,USERNAME,COMMAND,PROCESS,PROGRAM from v$session where sid=24;
 
       SID    SERIAL# USERNAME                COMMAND PROCESS                  PROGRAM              LOGON_TIM
---------- ---------- -------------------- ---------- ------------------------ -------------------- ---------
        24      10203 SYS                           0 29489                    rman@s96qmcr0d0 (TNS 24-NOV-12V1-V3)
       
       
SQL> alter system kill session '24,10203';
alter system kill session '24,10203'
*
ERROR at line 1:
ORA-00031: session marked for kill

      SID    SERIAL# USERNAME                          COMMAND PROCESS                  PROGRAM              STATUS
---------- ---------- ------------------------------ ---------- ------------------------ -------------------- --------
        24      10203 SYS                                     0 29489                    rman@s96qmcr0d0 (TNS KILLED

SELECT P.SPID, S.SID, S.SERIAL#
FROM V$PROCESS P, V$SESSION S
WHERE P.ADDR = S.PADDR
AND S.SID =24
-> Kill the process id from os level

-> Resync catalog;
-> Triger fresh backup.