ORA-00060: deadlock detected while waiting for resource

Pid=1290 Tid=1405425984 06/23/2014 06:54:50.792 - Exception for cursor TWSE_864_519518
DBError exception occurred in ORA11GDynamicSql::openCursor(StmtExecute)
   ORA-00060: deadlock detected while waiting for resource

sql string
SELECT  CONSOL_LOCN.DIRCT_VOL, CONSOL_LOCN.DIRCT_UOM_QTY FROM CONSOL_LOCN WHERE ( CONSOL_LOCN.PKT_CONSOL_LOCN_ID = :1 ) FOR UPDATE WAIT 120
input variables
  1: Address(0x2aaac055b7c0) Length(0) Type(2) "5491" - Indicator @ 0x2aaac0007618 = 0

  
Pid=1290 Tid=1085401408 06/23/2014 07:32:10.708 - lock detected (SQL aborted)
dbSqlString = SELECT  CONSOL_LOCN.DIRCT_VOL, CONSOL_LOCN.DIRCT_UOM_QTY FROM CONSOL_LOCN WHERE ( CONSOL_LOCN.PKT_CONSOL_LOCN_ID = :1 ) FOR UPDATE WAIT 120
connectionName = TWSE_2109

SELECT ai.index_name, 
       aic.column_name, 
       ai.index_type 
FROM   all_indexes ai, 
       all_ind_columns aic 
WHERE  ai.table_name = 'CONSOL_LOCN' 
       AND ai.index_name = aic.index_name 
       AND ai.table_name = aic.table_name 
       AND ai.owner = aic.index_owner 

SQL> update emp set sal = sal where ename = 'KING';

1 row updated.

SQL> update emp set sal = sal where ename = 'JONES';

1 row updated.

SQL> update emp set sal = sal where ename = 'ALLEN';

1 row updated.

SQL> update emp set sal = sal where ename = 'ALLEN';

SQL> update emp set sal = sal where ename = 'KING';

SQL> update emp set sal = sal where ename = 'JONES';

SQL> update emp set sal = sal where ename = 'KING';

1 row updated.

SQL> update emp set sal = sal where ename = 'ALLEN';
update emp set sal = sal where ename = 'ALLEN'
*
ERROR at line 1:
ORA-00060: deadlock detected while waiting for resource


SQL>