Solution : https://service.sap.com/sap/support/notes/1060314 (SAP Service marketplace login required)
Key words : 
jvm1 und jvm2 signals lead, process consumes large amount, reverse hostname lookup fails, terms disp+work, internet communication manager, bkgd program remains, writes error traces, patch collection solves, synchronous v2 update, update work processes
Related Notes : 
       
| 1056463 | Synchronous V2 update | 
| 1048572 | Signals JVM1 and JVM2 lead to a termination | 
| 1048257 | Message server crashes when HTTPS (SSL) are used | 
| 1046206 | Cancel transaction (Soft cancel) does not work | 
| 1043968 | Standalone enqueue: Problems during resource bottleneck | 
| 1043490 | No CLI_BREAK when transaction canceled | 
| 1042938 | JControl exits when reverse hostname lookup fails | 
| 1041544 | gwrd (Gateway) process consumes large amount of memory | 
| 1038930 | SAProuter 38 (7.00) writes ERROR traces | 
| 851852 | ICM Patch Collection (7.00) | 
| 812696 | Update work processes in the UPD status | 
| 698017 | ICM Patch Collection (6.40) | 
| 191191 | Partitioning update tables |