Solution : https://service.sap.com/sap/support/notes/737099 (SAP Service marketplace login required)
Key words : 
7 ext2 upgrade patch sapcar reason, terms igs j2ee r3e 4, upgrade/patch installationyou, igs/bin directory, sapntkill -int {processid_of_igswd}, kill -int {processid_of_igswd}, 7 ext2 system, j2ee installation, installer fails, solution stop
Related Notes : 
       
| 1362176 | Upgrade to SAP NW 7.1 EHP 1 for banking services 7.0 and 8.0 | 
| 1283141 | Add. info.: Upgrade to SAP NetWeaver 7.0 EHP1 SR1 Java | 
| 1267573 | Central Note: Upgrade to Systems on SAP NW 7.0 EHP2 Java | 
| 1252365 | Upgrades based on SAP NetWeaver 7.1 including EHP 1 | 
| 1156186 | Add. info.: Upgrade to SAP NetWeaver 7.0 including EHP1 Java | 
| 1102065 | Add. info. on upgrading to SAP NetWeaver 7.0 SR3 Java | 
| 1061649 | Upgrade to SAP NetWeaver Process Integration 7.1 | 
| 854989 | Patching Internet Graphics Server (IGS) on AIX | 
| 836198 | Add. info. on upgrading to SAP NW 7.0 Java | 
| 775047 | Add. info. on upgrading to SAP Web AS 6.40 SR1 | 
| 738663 | Integrated installation of the IGS and WebAS 6.30 | 
| 738661 | Remove the integrated IGS from a Unix based installation | 
| 737301 | How to remove the IGS from the start profile | 
| 718267 | Upgrade your integrated IGS 6.40 installation | 
| 661640 | Add. info. on upgrading to SAP Web AS 6.40 | 
| 658418 | INST:SAP J2EE Engine f. SAP Systems based on Web AS 6.30/UX | 
| 654006 | INST: SAP R/3 Enterprise 4.70 Ext. Set 2.00 on UNIX | 
| 580319 | INST: SAP Web AS 6.30 Installation on UNIX |