ADDITIONAL SYSTEM INFORMATION :
Property settings:
    awt.toolkit = sun.awt.X11.XToolkit
    file.encoding = UTF-8
    file.encoding.pkg = sun.io
    file.separator = /
    java.awt.graphicsenv = sun.awt.X11GraphicsEnvironment
    java.awt.printerjob = sun.print.PSPrinterJob
    java.class.path = .
    java.class.version = 52.0
    java.endorsed.dirs = /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/endorsed
    java.ext.dirs = /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/ext
        /usr/java/packages/lib/ext
    java.home = /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre
    java.io.tmpdir = /tmp
    java.library.path = /usr/java/packages/lib/amd64
        /usr/lib64
        /lib64
        /lib
        /usr/lib
    java.runtime.name = OpenJDK Runtime Environment
    java.runtime.version = 1.8.0_472-b08
    java.specification.maintenance.version = 6
    java.specification.name = Java Platform API Specification
    java.specification.vendor = Oracle Corporation
    java.specification.version = 1.8
    java.vendor = Temurin
    java.vendor.url = https://adoptium.net/
    java.vendor.url.bug = https://github.com/adoptium/adoptium-support/issues
    java.version = 1.8.0_472
    java.vm.info = mixed mode
    java.vm.name = OpenJDK 64-Bit Server VM
    java.vm.specification.name = Java Virtual Machine Specification
    java.vm.specification.vendor = Oracle Corporation
    java.vm.specification.version = 1.8
    java.vm.vendor = Temurin
    java.vm.version = 25.472-b08
    line.separator = \n
    os.arch = amd64
    os.name = Linux
    os.version = 4.15.0-196-generic
    path.separator = :
    sun.arch.data.model = 64
    sun.boot.class.path = /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/resources.jar
        /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/rt.jar
        /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/sunrsasign.jar
        /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/jsse.jar
        /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/jce.jar
        /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/charsets.jar
        /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/jfr.jar
        /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/classes
    sun.boot.library.path = /usr/lib/jvm/java-8-openjdk-new/jdk8u472-b08/jre/lib/amd64
    sun.cpu.endian = little
    sun.cpu.isalist =
    sun.io.unicode.encoding = UnicodeLittle
    sun.java.launcher = SUN_STANDARD
    sun.jnu.encoding = UTF-8
    sun.management.compiler = HotSpot 64-Bit Tiered Compilers
    sun.os.patch.level = unknown
    user.dir = [EDITED]
    user.home = /root
    user.language = en
    user.name = root
    user.timezone =

openjdk version "1.8.0_472"
OpenJDK Runtime Environment (Temurin)(build 1.8.0_472-b08)
OpenJDK 64-Bit Server VM (Temurin)(build 25.472-b08, mixed mode)

A DESCRIPTION OF THE PROBLEM :
System Configuration:
CPU: Intel Xeon (family: 6, model: 85, stepping: 4) - 20 siblings, 10 cores
VM: OpenJDK 64-Bit Server VM (25.472-b08 mixed mode linux-amd64 compressed oops)

Issue Description:
The JVM crashed with a SIGSEGV (0xb) during execution. The crash occurred in the VMThread, indicating an issue within the JVM internals, likely related to Garbage Collection (specifically handling Remembered Sets).

Error Details:
- Signal: SIGSEGV (0xb)
- Code: SEGV_ACCERR (0x2)
- Problematic Frame: V [libjvm.so+0xa58dcb] RSHashTableIter::has_next(unsigned long&)+0x2db

Snippet from hs_err_pid18158.log:
----------------------------------------------------------------------
# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0x00007f28685c0dcb, pid=, tid=
#
# JRE version: OpenJDK Runtime Environment (8.0_472-b08) (build 1.8.0_472-b08)
# Java VM: OpenJDK 64-Bit Server VM (25.472-b08 mixed mode linux-amd64 compressed oops)
# Problematic frame:
# V [libjvm.so+0xa58dcb] RSHashTableIter::has_next(unsigned long&)+0x2db
----------------------------------------------------------------------

Thread Context:
The crashing thread is `VMThread` (tid=0x00007f2748407700), which suggests the crash happened during a safepoint operation or GC maintenance task, not in application Java code.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Steps to Reproduce:

1. Clone the reproduction repository:
   $ [EDITED]
   $ cd BugReport

2. Extract the reproduction case (if compressed):
   $ unzip GCtestcase-1.zip

3. Compile and Run the reproduction script:

   Before running the script, please edit execution.properties and update the jvm and javac paths to point to your local installation.

   $ bash ./scripts/replay.sh -s sequence.json -t com/gcscheduling/generated/ConcurrentTest_20260110_014123_560.java -p vmoption.vmopts

---------- BEGIN SOURCE ----------
[EDITED]
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Reproducing this issue requires a custom Java agent (provided as a .jar file) that instruments class loading and garbage collection behavior in a specific way. This agent is essential to trigger the exact sequence of events leading to the crash.
To ensure the reproduction environment is complete and self-contained, we have packaged:
The Java agent JAR,
The generated test class,
The JVM options (vmopts),
And the execution script,
into a single archive (GCtestcase-1.zip) hosted in a public GitHub repository.

FREQUENCY :
OFTEN