JVM crash due to Java 8 GC | AEM

Last updated on 27 Des 2022

Issue

The AEM instance crashes and the process is missing. The hs_err* file is generated listing G1ParScanThreadState thread as the active thread at the time of the crash.

#
# A fatal error has been detected by the Java Runtime Environment:
#
#  SIGSEGV (0xb) at pc=0x00007f0d05d43315, pid=2219, tid=0x00007f0d0423e700
#
# JRE version: Java(TM) SE Runtime Environment (8.0_131-b31) (build 1.8.0_131-b31)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (25.131-b31 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# V  [libjvm.so+0x5c5315]  G1ParScanThreadState::copy_to_survivor_space(InCSetState, oopDesc*, markOopDesc*)+0x45
#
# Core dump written. Default location: /aem/author core.2219
#
# If you would like to submit a bug report, please visit:
#   http://bugreport.java.com/bugreport/crash.jsp
#

---------------  T H R E A D  ---------------

Current thread (0x00007f0d0002f000):  GCTaskThread [stack: 0x00007f0d0413e000,0x00007f0d0423f000] [id=2227]

Resolution

Replace the following JVM parameter in the bin/start script:

-XX:+UseG1GC

with the following instead:

-XX:+AlwaysPreTouch -XX:+TieredCompilation -XX:NewRatio=1 -XX:+UseConcMarkSweepGC -XX:MaxMetaspaceSize=1024m -XX:ParallelGCThreads=2 -XX:ConcGCThreads=2 -XX:MaxTenuringThreshold=15