Reproducer:

build/linux-x86_64-server-release/jdk/bin/java -XX:+UseG1GC -XX:ActiveProcessorCount=2147483646
uint G1ConcRefinementThreads=268435457 is outside the allowed range [ 0 ... 268435455 ]
#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (jvmFlagAccess.cpp:117), pid=2906209, tid=2906210
# fatal error: FLAG_SET_ERGO cannot be used to set an invalid value for G1ConcRefinementThreads
#
# JRE version: (27.0) (build )
# Java VM: OpenJDK 64-Bit Server VM (27-internal-adhoc.jonas.openjdkpatches, mixed mode, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Core dump will be written. Default location: Determined by the following: "/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %d" (alternatively, falling back to /home/jonas/jdk/openjdk_patches/core.2906209)
#
# An error report file with more information is saved as:
# /home/jonas/jdk/openjdk_patches/hs_err_pid2906209.log
#
#
Aborted (core dumped)