Solution : https://service.sap.com/sap/support/notes/197203 (SAP Service marketplace login required)
Key words : 
error - running temporary sql script        '/oracle/xxx/sapreorg/dbacmd, database check additional key words, message_buf = 1000000and call sapdba, fatal error occured, dba-parameter message_buf, execute os command, error messages, internal error, check phase, sapdba terminatesin
Related Notes : 
       
| 144326 | Corrections in the SAPDBA Version 4.6B | 
| 144325 | Corrections in the SAPDBA Version 4.6A | 
| 144323 | Corrections in SAPDBA Version 4.5B |