Solution : https://service.sap.com/sap/support/notes/790867 (SAP Service marketplace login required)
Key words : 
created trace file itsexceptionrecord<number>, internet transaction server, detailed stack dump, agate process incorrectly, agate process crashes, kernel support package 46, agate crash, support package 15, support package, 'sap kernel 640'
Related Notes : 
       
| 563161 | SAP GUI, SAP ITS & SAP IGS patches on Service Marketplace | 
| 335521 | ITS patch installation of kernel files | 
| 330793 | Downloading patches |