Prerequisite check "CheckActiveFilesAndExecutables" failed while applying PSU 19121548 on Oracle 11.2.0.3 Home

PROBLEM: [oracleuser@TESTSERVER 19121548]$ opatch apply Oracle Interim Patch Installer version 11.2.0.3.6 Copyright (c) 2013, Oracle Corporation. All rights reserved. Oracle Home : /oracle_home/app/orahome Central Inventory : /oracle_home/app/oracle/oraInventory from : /oracle_home/app/orahome/oraInst.loc OPatch version : 11.2.0.3.6 OUI version : 11.2.0.3.0 Log file location : /oracle_home/app/orahome/cfgtoollogs/opatch/opatch2015-01-17_23-26-27PM_1.log Verifying environment and performing prerequisite checks... Prerequisite check "CheckActiveFilesAndExecutables" failed. The details are: Following executables are active : /oracle_home/app/orahome/lib/libclntsh.so.11.1 UtilSession failed: Prerequisite check "CheckActiveFilesAndExecutables" failed. Log file location: /oracle_home/app/orahome/cfgtoollogs/opatch/opatch2015-01-17_23-26-27PM_1.log CAUSE: Some processes are using the named executable file "/oracle_home/app/orahome/lib/libclntsh.so.11.1" SOLUTION: Identify the processes using the executable and kill them. [oracleuser@TESTSERVER 19121548]$ /sbin/fuser /oracle_home/app/orahome/lib/libclntsh.so.11.1 /oracle_home/app/orahome/lib/libclntsh.so.11.1: 416m 422m 813m 838m 873m 879m 1187m 1549m 1746m 1812m 2187m 2222m 2223m 2254m 2505m 2821m 3031m 3158m 3452m 3514m 3552m 3572m 3808m 4112m 4317m 4459m 4730m 4764m 4841m 4882m 5061m 5402m 5572m 5694m 6013m 6060m 6101m 6208m 6353m 6724m 6851m 6954m 7317m 7422m 7471m 7615m 7704m 8176m 8184m 8325m 8636m 8727m 8753m 8980m 9055m 9553m 9592m 9839m 9921m 10073m 10098m 10384m 10435m 10928m 10976m 10994m 11268m 11391m 11399m 11430m 11686m 11701m 12229m 12241m 12544m 12576m 12670m 12676m 12699m 12982m 12998m 13518m 13520m 13841m 13986m 13987m 13988m 14021m 14301m 14340m 14766m 14808m 15216m 15417m 15443m 15457m 15853m 15859m 16206m 16281m 16566m 16720m 16755m 16781m 17140m 17148m 17484m 17549m 17563m 17863m 18006m 18029m 18068m 18453m 18470m 18759m 18836m 18861m 19119m 19299m 19304m 19358m 19727m 19774m 20032m 20118m 20133m 20410m 20559m 20569m 20639m 21025m 21085m 21375m 21400m 21680m 21807m 21829m 22358m 22438m 22672m 22764m 22958m 23004m 23167m 23185m 23629m 23737m 23930m 23996m 24304m 24350m 24427m 24460m 24943m 25052m 25208m 25241m 25604m 25623m 25692m 25757m 26213m 26351m 26455m 26517m 26899m 26910m 26968m 27044m 27513m 27677m 27755m 27829m 28175m 28192m 28243m 28412m 28783m 29001m 29095m 29239m 29455m 29460m 29497m 29705m 30049m 30330m 30360m 30630m 30750m 30763m 30770m 30978m 31340m 31610m 31629m 31993m 32017m 32054m 32055m 32307m 32647m [oracleuser@TESTSERVER 19121548]$ kill -9 422 [oracleuser@TESTSERVER 19121548]$ kill -9 813 [oracleuser@TESTSERVER 19121548]$ kill -9 838 [oracleuser@TESTSERVER 19121548]$ kill -9 873 [oracleuser@TESTSERVER 19121548]$ kill -9 879 [oracleuser@TESTSERVER 19121548]$ kill -9 1187 [oracleuser@TESTSERVER 19121548]$ kill -9 1549 [oracleuser@TESTSERVER 19121548]$ kill -9 1746 credit to http://yichen-oracledba.blogspot.com/