All launchers terminated?

Hi there,
I am getting a very strange error, the log is attached below:
OS: RHEL 7
everything works fine at the beginning. a few hours later, when I came back and run my test again, all tests just terminate for no reason and not report generated. I can’t use any other version of KRE as shown in my other post: KRE offline activation question about the num of RE running sessions

[root@jenkins .metadata]# cat .log
katalon.versionNumber=7.3.3
katalon.buildNumber=1

INFO: Katalon Version: 7.3.3
INFO: Command-line arguments: -runMode=console -projectPath=/my/projectPath -browserType=Chrome -retry=0 -statusDelay=15 -testSuitePath=Test Suites/Mytest -executionProfile=default
INFO: User working dir: /my/working/dir
INFO: Error log: /tmp/session-9c4e55ac/.metadata/.log
INFO: Katalon TestOps server URL: https://analytics.katalon.com
INFO: Katalon Store server URL: https://store.katalon.com
INFO: User home: /my/user/home
INFO: Java vendor: Oracle Corporation
INFO: Java version: 1.8.0_242
INFO: Local OS: Linux 64bit
INFO: CPU load: 0%
INFO: Total memory: 15885 MB
INFO: Free memory: 1774 MB
INFO: Machine ID: my-machine-ID

Activating…
Start activating offline…
Search for valid offline licenses in folder: $HOME/.katalon/license
Start checking license: KRE_my-machine-id_30473674.lic
KRE_my-machine-id_30473674.lic is valid.
The number of valid offline licenses: 1
The number of Runtime Engine running sessions: 1
Start check license task
Launcher status after execution process completed: Running
Start writing execution.uuid file to folder:
/path/to/folder
Start generating JUnit report folder at:
/path/to/folder
JUnit report were generated at folder:
/path/to/folder
Execution completed. Exit code: 1.
Start clean up session
End check license task
End clean up session
Start release license task
End release license task
All launchers terminated
!SESSION 2020-04-16 16:45:00.418 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.8.0_242
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=en_CA
Framework arguments: -runMode=console -projectPath=/var/lib/jenkins/workspace/KatalonTestRunner -browserType=Chrome -retry=0 -statusDelay=15 -testSuitePath=Test Suites/smoke -executionProfile=ins01
Command-line arguments: -os linux -ws gtk -arch x86_64 -data @noDefault -runMode=console -projectPath=my/projectPath -browserType=Chrome -retry=0 -statusDelay=15 -testSuitePath=Test Suites/myTest -executionProfile=default

!ENTRY org.eclipse.core.resources 2 10035 2020-04-16 16:45:24.895
!MESSAGE The workspace will exit with unsaved changes in this session.
[root@jenkins .metadata]#

Hi,

OOM issue? (Out Of Memory)
check
/var/log/message