while patching oracle 12c database on Linux OS environment, i faced the below error while applying the patch using Opatch utility (although the database is shutdown):
Verifying environment and performing prerequisite checks…
Prerequisite check “CheckActiveFilesAndExecutables” failed.
The details are:
Following executables are active :
UtilSession failed: Prerequisite check “CheckActiveFilesAndExecutables” failed.
find the process that is locking the file system using the fuser command
fuser -u /oracl/db11/product/126.96.36.199/lib/libclntsh.so.12.1
and then kill it using kill -9 command