Solution : https://service.sap.com/sap/support/notes/867690 (SAP Service marketplace login required)
Key words : 
high load situations, patch collection solves, icm patch collection, work processes wait, client server technology, patch levels, work process, enqueuethe server, message server, alarm handler
Related Notes : 
       
| 867583 | Work processes wait for semaphore 8 | 
| 867582 | Sporadic roll-in errors in high load situations | 
| 851852 | ICM Patch Collection (7.00) | 
| 698017 | ICM Patch Collection (6.40) | 
| 503557 | User with 0 sessions in SM04 |