Object locked in v$locked_object but can't find session/process blocking

Hi,
I am on database 10.2.0.5, windows x64.
A developer calls me and tells me there are locks on 3 tables, and the locks are not released.
So I run this to see which objects are locked by which session
select vlo.object_id, vlo.session_id, vlo.oracle_username, vlo.process
  , DECODE(vlo.LOCKED_MODE, 0,'NONE', 1,'NULL', 2,'ROW SHARE', 3,'ROW EXCLUSIVE', 4,'SHARE', 5,'SHARE ROW EXCLUSIVE', 6,'EXCLUSIVE', NULL) LOCK_MODE
  , do.owner, do.object_name, do.object_type
  , vs.saddr, vs.serial#, vs.paddr, vs.username, vs.ownerid, vs.status, vs.server, vs.schemaname, vs.osuser, vs.machine, vs.program, vs.type, vs.logon_time, vs.last_call_et
  , vs.blocking_session_status, vs.event#, vs.event, vs.wait_class#, vs.wait_class, vs.wait_time, vs.seconds_in_wait, vs.state
  from v$locked_object vlo
    inner join dba_objects do on (vlo.object_id = do.object_id)
    left outer join v$session vs on (vlo.session_id = vs.sid)-----------
I get (after finding out my table locks come from SID 514)
OBJECT_ID              SESSION_ID             ORACLE_USERNAME                PROCESS      LOCK_MODE           OWNER                          OBJECT_NAME                                                                                                                      OBJECT_TYPE         SADDR            SERIAL#                PADDR            USERNAME                       OWNERID                STATUS   SERVER    SCHEMANAME                     OSUSER                         MACHINE                                                          PROGRAM                                                          TYPE       LOGON_TIME                LAST_CALL_ET           BLOCKING_SESSION_STATUS EVENT#                 EVENT                                                            WAIT_CLASS#            WAIT_CLASS                                                       WAIT_TIME              SECONDS_IN_WAIT        STATE              
373122                 514                    IRMFIN                         22AB7298     ROW EXCLUSIVE       IRMFIN                         IC_PRODUCT_STATUS                                                                                                                TABLE               000007FF3E1A9070 1301                   000007FF3E639120 IRMFIN                         2147483644             INACTIVE DEDICATED IRMFIN                         IRMTEST                        IRM                                                              DSA0:[GEMBASE730.][RUN]GEM.EXE                                   USER       2012/09/05 13:55:51       702                    NO HOLDER               263                    SQL*Net message from client                                      6                      Idle                                                             0                      702                    WAITING            
373025                 514                    IRMFIN                         22AB7298     ROW EXCLUSIVE       IRMFIN                         IC_BIN_DETAIL_STATUS                                                                                                             TABLE               000007FF3E1A9070 1301                   000007FF3E639120 IRMFIN                         2147483644             INACTIVE DEDICATED IRMFIN                         IRMTEST                        IRM                                                              DSA0:[GEMBASE730.][RUN]GEM.EXE                                   USER       2012/09/05 13:55:51       702                    NO HOLDER               263                    SQL*Net message from client                                      6                      Idle                                                             0                      702                    WAITING            
373055                 514                    IRMFIN                         22AB7298     ROW EXCLUSIVE       IRMFIN                         IC_LOT_STATUS                                                                                                                    TABLE               000007FF3E1A9070 1301                   000007FF3E639120 IRMFIN                         2147483644             INACTIVE DEDICATED IRMFIN                         IRMTEST                        IRM                                                              DSA0:[GEMBASE730.][RUN]GEM.EXE                                   USER       2012/09/05 13:55:51       702                    NO HOLDER               263                    SQL*Net message from client                                      6                      Idle                                                             0                      702                    WAITING             -----------
I run it again and I get something different, this time the lock is still there, but no session. select * from v$session where sid= 514 returns nothing.
I get
OBJECT_ID              SESSION_ID             ORACLE_USERNAME                PROCESS      LOCK_MODE           OWNER                          OBJECT_NAME                                                                                                                      OBJECT_TYPE         SADDR            SERIAL#                PADDR            USERNAME                       OWNERID                STATUS   SERVER    SCHEMANAME                     OSUSER                         MACHINE                                                          PROGRAM                                                          TYPE       LOGON_TIME                LAST_CALL_ET           BLOCKING_SESSION_STATUS EVENT#                 EVENT                                                            WAIT_CLASS#            WAIT_CLASS                                                       WAIT_TIME              SECONDS_IN_WAIT        STATE              
373122                 514                                                                ROW EXCLUSIVE       IRMFIN                         IC_PRODUCT_STATUS                                                                                                                TABLE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
373025                 514                                                                ROW EXCLUSIVE       IRMFIN                         IC_BIN_DETAIL_STATUS                                                                                                             TABLE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                      
373055                 514                                                                ROW EXCLUSIVE       IRMFIN                         IC_LOT_STATUS                                                                                                                    TABLE                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                       When I run the query later, I sometimes get another session, but the lock stays. It seems here, that I am catching the same SID on new sessions, but it is probably a different serial # than the original session locking the table rows.
I get nothing from
select * from dba_waiters;
select * from dba_blockers;
Now why are those 3 tables row locked on some rows and I can't find the session responsible? The developer tells me his application crashed and the rows are locked since.
So far ( keep in mind I am not a locking expert) the only way I found to release the locks is a DB bounce, its a test DB so no biggy.
Is this a bug? Am I missing something?
This is the second time this has happened. How can I solve this issue?
Best wishes to all.

Thank you for your reply.
I do not think I can kill the session (514) it does not exist, even though v$locked_object reports tables are locked by session 514
see below
select * from v$locked_object
XIDUSN                 XIDSLOT                XIDSQN                 OBJECT_ID              SESSION_ID             ORACLE_USERNAME                OS_USER_NAME                   PROCESS      LOCKED_MODE           
9                      26                     351467                 373122                 514                                                                                               3                     
10                     41                     339655                 373025                 514                                                                                               3                     
11                     6                      92004                  373055                 514                                                                                               3                     
select * from v$session order by sid
( no session 514)
SADDR            SID                    SERIAL#                AUDSID                 PADDR            USER#                  USERNAME                       COMMAND                OWNERID                TADDR            LOCKWAIT         STATUS   SERVER    SCHEMA#                SCHEMANAME                     OSUSER                         PROCESS      MACHINE                                                          PORT                   TERMINAL         PROGRAM                                                          TYPE       SQL_ADDRESS      SQL_HASH_VALUE         SQL_ID        SQL_CHILD_NUMBER       PREV_SQL_ADDR    PREV_HASH_VALUE        PREV_SQL_ID   PREV_CHILD_NUMBER      PLSQL_ENTRY_OBJECT_ID  PLSQL_ENTRY_SUBPROGRAM_ID PLSQL_OBJECT_ID        PLSQL_SUBPROGRAM_ID    MODULE                                           MODULE_HASH            ACTION                           ACTION_HASH            CLIENT_INFO                                                      FIXED_TABLE_SEQUENCE   ROW_WAIT_OBJ#          ROW_WAIT_FILE#         ROW_WAIT_BLOCK#        ROW_WAIT_ROW#          LOGON_TIME                LAST_CALL_ET           PDML_ENABLED FAILOVER_TYPE FAILOVER_METHOD FAILED_OVER RESOURCE_CONSUMER_GROUP          PDML_STATUS PDDL_STATUS PQ_STATUS CURRENT_QUEUE_DURATION CLIENT_IDENTIFIER                                                BLOCKING_SESSION_STATUS BLOCKING_INSTANCE      BLOCKING_SESSION       SEQ#                   EVENT#                 EVENT                                                            P1TEXT                                                           P1                     P1RAW            P2TEXT                                                           P2                     P2RAW            P3TEXT                                                           P3                     P3RAW            WAIT_CLASS_ID          WAIT_CLASS#            WAIT_CLASS                                                       WAIT_TIME              SECONDS_IN_WAIT        STATE               SERVICE_NAME                                                     SQL_TRACE SQL_TRACE_WAITS SQL_TRACE_BINDS ECID                                                            
582                  41322092               000007FF3E6279B0 88                     IRMFIN                         0                      2147483644                                               INACTIVE NONE      88                     IRMFIN                         IRM-NTSERVER\ttoupet           2768:5812    IRM-NTSERVER\IRM-WINDEV                                          2091                   IRM-WINDEV       WDMAP.EXE                                                        USER       00               0                                                           000007FF296D46B0 1249880231             gkm8w8157za57 0                                                                                                                     WDMAP.EXE                                        3924246850                                              0                                                                                       4272871                480874                 5                      109733                 0                      2012/09/06 08:54:26       369                    NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       NO HOLDER                                                             55                     263                    SQL*Net message from client                                      driver id                                                        1297371904             000000004D545300 #bytes                                                           1                      0000000000000001                                                                  0                      00               2723168908             6                      Idle                                                             0                      369                    WAITING             irtrcs01.ivacorm.com                                             DISABLED  FALSE           FALSE                                                                           
000007FF3E1A0FA0 508                    55443                  41321967               000007FF3E62E488 93                     RODMILL                        0                      2147483644                                               INACTIVE DEDICATED 93                     RODMILL                        flong                          4144         IT011                                                            49450                  unknown          SQL Developer                                                    USER       00               0                                                           000007FF126A6BC0 293046999              7jjvy5s8rg2qr 0                                                                                                                     SQL Developer                                    1012150930                                              0                                                                                       4280261                373579                 5                      348686                 0                      2012/09/06 08:39:23       218                    NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       NO HOLDER                                                             5486                   263                    SQL*Net message from client                                      driver id                                                        675562835              0000000028444553 #bytes                                                           1                      0000000000000001                                                                  0                      00               2723168908             6                      Idle                                                             0                      218                    WAITING             irtrcs01.ivacorm.com                                             DISABLED  FALSE           FALSE                                                                           
000007FF3E1A2518 509                    3086                   41287084               000007FF3E628A20 64                     SYSMAN                         47                     2147483644             000007FF3D7C21D8                  ACTIVE   SHARED    64                     SYSMAN                                                        1234         IRMFAX                                                           1341                                    OMS                                                              USER       000007FF357CE418 4281219134             2b064ybzkwf1y 0                      000007FF357A8BF0 2532399038             5dwsqwabg2pxy 0                      178612                 8                                                                       OEM.SystemPool                                   2960518376             NotificationMgr                  3664650334             IRMFAX.ivacorm.com:4889_Management_Service                       4281687                177737                 14                     40683                  0                      2012/09/03 11:44:37       7                      NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       UNKNOWN                                                               48888                  45                     wait for unread message on broadcast channel                     channel context                                                  8792836163648          000007FF3DE04840 channel handle                                                   8792836060256          000007FF3DDEB460                                                                  0                      00               2723168908             6                      Idle                                                             0                      7                      WAITING             irtrcs01.ivacorm.com                                             DISABLED  FALSE           FALSE                                                                           
000007FF3E1A3A90 510                    35277                  41286699               000007FF3E6279B0 64                     SYSMAN                         0                      2147483644                                               INACTIVE NONE      64                     SYSMAN                                                        1234         IRMFAX                                                           3154                                    OMS                                                              USER       00               0                                                           000007FF3E844AD8 3275117642             43c5ykm1mcp2a 1                                                                                                                     OEM.CacheModeWaitPool                            796036576                                               0                      IRMFAX.ivacorm.com:4889_Management_Service                       4280509                -1                     0                      0                      0                      2012/09/03 10:58:32       169                    NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       NO HOLDER                                                             29909                  263                    SQL*Net message from client                                      driver id                                                        1297371904             000000004D545300 #bytes                                                           1                      0000000000000001                                                                  0                      00               2723168908             6                      Idle                                                             0                      169                    WAITING             irtrcs01.ivacorm.com                                             DISABLED  FALSE           FALSE                                                                           
000007FF3E1A5008 511                    51686                  41287085               000007FF3E6279B0 64                     SYSMAN                         0                      2147483644                                               INACTIVE NONE      64                     SYSMAN                                                        1234         IRMFAX                                                           1342                                    OMS                                                              USER       00               0                                                           000007FF36C3CED8 2539923080             6v7n0y2bq89n8 0                                                                                                                     OEM.SystemPool                                   2960518376             JobDispatcher                    875884737              IRMFAX.ivacorm.com:4889_Management_Service                       4281706                -1                     0                      0                      0                      2012/09/03 11:44:37       5                      NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       NO HOLDER                                                             38929                  263                    SQL*Net message from client                                      driver id                                                        1297371904             000000004D545300 #bytes                                                           1                      0000000000000001                                                                  0                      00               2723168908             6                      Idle                                                             0                      5                      WAITING             irtrcs01.ivacorm.com                                             DISABLED  FALSE           FALSE                                                                           
000007FF3E1A6580 512                    28994                  41293063               000007FF3E6279B0 64                     SYSMAN                         0                      2147483644                                               INACTIVE NONE      64                     SYSMAN                                                        1234         IRMFAX                                                           3636                                    OMS                                                              USER       00               0                                                           000007FF32990C90 1763828656             44nz3b1nk3sxh 1                                                                                                                     OEM.CacheModeWaitPool                            796036576                                               0                      IRMFAX.ivacorm.com:4889_Management_Service                       4280509                -1                     0                      0                      0                      2012/09/04 00:00:02       169                    NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       NO HOLDER                                                             20902                  263                    SQL*Net message from client                                      driver id                                                        1297371904             000000004D545300 #bytes                                                           1                      0000000000000001                                                                  0                      00               2723168908             6                      Idle                                                             0                      169                    WAITING             irtrcs01.ivacorm.com                                             DISABLED  FALSE           FALSE                                                                           
000007FF3E1ABB60 516                    48427                  41292026               000007FF3E62DC50 93                     RODMILL                        0                      2147483644                                               INACTIVE DEDICATED 93                     RODMILL                        ebesner                        10808        Fingers                                                          59004                  unknown          SQL Developer                                                    USER       00               0                                                           000007FF127B0A58 351849430              bkcpdnnagjkyq 0                                                                                                                     SQL Developer                                    1012150930                                              0                                                                                       4049825                533716                 21                     17036                  0                      2012/09/03 21:53:47       61389                  NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       NO HOLDER                                                             2578                   263                    SQL*Net message from client                                      driver id                                                        675562835              0000000028444553 #bytes                                                           1                      0000000000000001                                                                  0                      00               2723168908             6                      Idle                                                             0                      61389                  WAITING             irtrcs01.ivacorm.com                                             DISABLED  FALSE           FALSE                                                                           
000007FF3E1AD0D8 517                    2                      0                      000007FF3E635FD0 0                                                     0                      2147483644                                               ACTIVE   DEDICATED 0                      SYS                            SYSTEM                         4292         CHARLIE                                                          0                      CHARLIE          ORACLE.EXE (q001)                                                BACKGROUND 00               0                                    0                      00               0                                    0                                                                                                                                                                      0                                                       0                                                                                       112                    -1                     0                      0                      0                      2012/08/22 17:46:54       1264692                NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       UNKNOWN                                                               2685                   281                    Streams AQ: qmn slave idle wait                                                                                                   0                      00                                                                                0                      00                                                                                0                      00               2723168908             6                      Idle                                                             0                      16                     WAITING             SYS$BACKGROUND                                                   DISABLED  FALSE           FALSE                                                                           
000007FF3E1AE650 518                    2                      4294967295             000007FF3E635798 0                      SYS                            3                      2147483644                                               INACTIVE DEDICATED 0                      SYS                            IRM-NTSERVER\cluster           3704:1572    IRM-NTSERVER\CHARLIE                                             49181                  CHARLIE          rhs.exe                                                          USER       000007FF3EA55E08 654885888              bcfjz80mhjj00 0                      000007FF3EA55E08 654885888              bcfjz80mhjj00 0                                                                                                                     rhs.exe                                          1733424889                                              0                                                                                       4281686                -1                     0                      0                      0                      2012/08/22 17:46:54       16                     NO           NONE          NONE            NO                                           DISABLED    ENABLED     ENABLED   0                                                                                       NO HOLDER                                                             58582                  263                    SQL*Net message from client                                      driver id                                                        1413697536             0000000054435000 #bytes                                                           1                      0000000000000001                                                                  0                      00               2723168908             6                      Idle                                                             0                      16                     WAITING             SYS$USERS                                                        DISABLED  FALSE           FALSE                                                                           

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