Solution : https://service.sap.com/sap/support/notes/1349718 (SAP Service marketplace login required)
Key words : 
sap application server java trace files, 52 - 51_rel - optu - solaris sparc - 6 - bas2, sap java server vm, sap java virtual machine, restricted thread lock failed, tid=17766## java vm, sap jvm crashes, solaris operating systems, +0x1cfc3c8]  bool vmcmutex, high load situations
Related Notes : 
       
| 1367498 | SAP JVM installation prerequisites | 
| 1249462 | How to import an SAP JVM patch into an SAP BC | 
| 1133020 | How to import a SAP JVM patch into an AS Java |