Solution : https://service.sap.com/sap/support/notes/975569 (SAP Service marketplace login required)
Key words : 
core dump occurs, display lock entries, standalone enqueue server, execute transaction sm12, transaction sm12, communication area, patch levels, prerequisites, note 985644
Related Notes : 
       
| 991211 | CST Patch Collection 42 2006 | 
| 985644 | Core dump in SM12 with standalone enqueue server |