When install or check 13.5 OEM agent on Linux 8, the following errors occur:

$ emctl status agent
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00006f2078020000, 2798568, 0) failed; error='Cannot allocate memory' (errno=12).

$ cat /tmp/ hs_err_pid12345.log
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 1400832 bytes for committing reserved memory.
# Possible reasons:
#   The system is out of physical RAM or swap space
#   The process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap
# Possible solutions:
#   Reduce memory load on the system
#   Increase physical memory or swap space
#   Check if swap backing store is full
#   Decrease Java heap size (-Xmx/-Xms)
#   Decrease number of Java threads
#   Decrease Java thread stack sizes (-Xss)
#   Set larger code cache with -XX:ReservedCodeCacheSize=
# This output file may be truncated or incomplete.
#
# Set larger code cache with -XX:ReservedCodeCacheSize=, tid=0x00007fd043ec1700
#
# JRE version:  (8.0_261-b12) (build )
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.261-b12 mixed mode linux-amd64 compressed oops)
# Core dump written. Default location: /u01/app/oracle/product/13.5.0/agent/agent_inst/sysman/emd/core or core.12345

Also when installing Oracle 12.2 on Linux 8, the following errors occur:

ID: oracle.install.commons.util.exception.AbstractErrorAdvisor:849
oracle.cluster.verification.VerificationException: An internal error occurred within cluster verification framework
PRCR-1172 : Failed to execute "srvmhelper" for -getTargetHubSize
PRCR-1172 : Failed to execute "srvmhelper" for -getTargetHubSize
PRCR-1172 : Failed to execute "srvmhelper" for -getTargetHubSize
PRCR-1172 : Failed to execute "srvmhelper" for -getTargetHubSize

$ cluvfy stage -pre dbinst -allnodes -r 12.2 -d /u01/app/oracle/product/12.2.0/dbhome_1
Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x00007f7aa945a000, 2793472, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 2793472 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /home/oracle/hs_err_pid79287.log

SOLUTION