A SIGSEV was raised in a routine Github Actions testing of jdk8u-dev on Linux x86.

This happened  when running the hotspot/test/gc/6581734/Test6581734.java test.

# A fatal error has been detected by the Java Runtime Environment:
#
# SIGSEGV (0xb) at pc=0xf0d2c0c5, pid=6893, tid=0xe12beac0
#
# JRE version: OpenJDK Runtime Environment (8.0_472) (build 1.8.0_472-internal-vieiro-bd2e71698bec5e85239f4bb6a3461cb8a3609b5f-b00)
# Java VM: OpenJDK Server VM (25.472-b00 mixed mode linux-x86 )
# Problematic frame:
# V [libjvm.so+0x31b0c5] CompactibleFreeListSpace::block_size(HeapWord const*) const+0x55
#
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
# An error report file with more information is saved as:
# /home/runner/work/jdk8u-dev/jdk8u-dev/test-results/testoutput/hotspot_tier1/JTwork/scratch/hs_err_pid6893.log
#