RMAN Issue

Question

I am having issue with RMAN
I have Oracle 11gR2 database on HP-UX. when I issue any command in RMAN prompt, its displaying the information but it's not returning to RMAN prompt, I have to hit CTRL+C to come out. But I have 2 more database on the same home, and I don't have this problem on that database.
oracle@hublhp10:/home/oracle$ rman target /
Recovery Manager: Release 11.2.0.1.0 - Production on Mon Mar 19 15:00:53 2012
Copyright (c) 1982, 2009, Oracle and/or its affiliates.  All rights reserved.
connected to target database: IMGPROD (DBID=2867365220)
RMAN> show all;
using target database control file instead of recovery catalog
RMAN configuration parameters for database with db_unique_name IMGPROD are:
CONFIGURE RETENTION POLICY TO REDUNDANCY 1; # default
CONFIGURE BACKUP OPTIMIZATION ON;
CONFIGURE DEFAULT DEVICE TYPE TO DISK; # default
CONFIGURE CONTROLFILE AUTOBACKUP ON;
CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '/imgback/RMAN/cf-IMGPROD-%F';
CONFIGURE DEVICE TYPE DISK PARALLELISM 1 BACKUP TYPE TO BACKUPSET; # default
CONFIGURE DATAFILE BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE ARCHIVELOG BACKUP COPIES FOR DEVICE TYPE DISK TO 1; # default
CONFIGURE MAXSETSIZE TO UNLIMITED; # default
CONFIGURE ENCRYPTION FOR DATABASE OFF; # default
CONFIGURE ENCRYPTION ALGORITHM 'AES128'; # default
CONFIGURE COMPRESSION ALGORITHM 'BASIC' AS OF RELEASE 'DEFAULT' OPTIMIZE FOR LOAD TRUE ; # default
CONFIGURE ARCHIVELOG DELETION POLICY TO NONE; # default
CONFIGURE SNAPSHOT CONTROLFILE NAME TO '/imgback/RMAN/snapcf_imgprod.f';
RMAN>
RMAN> report obsolete;
RMAN retention policy will be applied to the command
RMAN retention policy is set to redundancy 1
Report of obsolete backups and copies
Type                 Key    Completion Time    Filename/Handle
Archive Log          1      19-MAR-12          /imgarch/ORACLE/imgprod/al_imgprod_1_283_777982948.dbf

Answer 1

I traced the session, see the following
WAIT #2: nam='control file sequential read' ela= 143 file#=0 block#=17 blocks=1 obj#=-1 tim=11750515395399
WAIT #2: nam='control file sequential read' ela= 143 file#=0 block#=1 blocks=1 obj#=-1 tim=11750515395853
WAIT #2: nam='control file sequential read' ela= 144 file#=0 block#=15 blocks=1 obj#=-1 tim=11750515396024
WAIT #2: nam='control file sequential read' ela= 145 file#=0 block#=17 blocks=1 obj#=-1 tim=11750515396192
WAIT #2: nam='control file sequential read' ela= 206 file#=0 block#=1 blocks=1 obj#=-1 tim=11750515396719
WAIT #2: nam='control file sequential read' ela= 142 file#=0 block#=15 blocks=1 obj#=-1 tim=11750515396909
WAIT #2: nam='control file sequential read' ela= 168 file#=0 block#=17 blocks=1 obj#=-1 tim=11750515397102
FETCH #2:c=0,e=16905,p=0,cr=0,cu=0,mis=0,r=1,dep=0,og=1,plh=818693323,tim=11750515397527
WAIT #2: nam='SQL*Net message from client' ela= 450 driver id=1650815232 #bytes=1 p3=0 obj#=-1 tim=11750515398178
CLOSE #2:c=0,e=27,dep=0,type=3,tim=11750515398262
=====================
PARSING IN CURSOR #4 len=205 dep=0 uid=0 oct=3 lid=0 tim=11750515399507 hv=1796820951 ad='c0000004fe449f88' sqlid='gq4u3dppjkmyr'
select /*+ rule */ round(sum(MBYTES_PROCESSED)), round(sum(INPUT_BYTES)), round(sum(OUTPUT_BYTES)) from V$RMAN_STATUS START WITH RECID = :row_id and STAMP = :row_stamp CONNECT BY PRIOR RECID = parent_recid
END OF STMT
PARSE #4:c=0,e=556,p=0,cr=0,cu=0,mis=1,r=0,dep=0,og=1,plh=0,tim=11750515399506