Submit and assign this bug on behalf of tobytbzhang@tencent.com.

Following test crashes on debug build with the options: "-XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -XX:+VerifyBeforeGC -XX:+VerifyRememberedSets".

public class A {
    public static void main(String... args) {
        System.gc();
    }
}

#
# A fatal error has been detected by the Java Runtime Environment:
#
# Internal Error (/data1/ws/jdk/src/hotspot/share/oops/compressedOops.inline.hpp:135), pid=1161112, tid=1161119
# assert(check_alignment(result)) failed: address not aligned: 0x00000008baadbabe
#
# JRE version: OpenJDK Runtime Environment (18.0) (fastdebug build 18-internal+0-adhoc.root.jdk)
# Java VM: OpenJDK 64-Bit Server VM (fastdebug 18-internal+0-adhoc.root.jdk, mixed mode, sharing, tiered, compressed oops, compressed class ptrs, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xb3ef72] HeapRegion::block_size(HeapWordImpl* const*) const+0x232
#
# Core dump will be written. Default location: Core dumps may be processed with "/usr/lib/systemd/systemd-coredump %P %u %g %s %t %c %h %e" (or dumping to /data1/ws/jdk/core.1161112)
#
# If you would like to submit a bug report, please visit:
# https://bugreport.java.com/bugreport/crash.jsp
#

--------------- S U M M A R Y ------------

Command Line: -Xlog:gc*=trace -XX:+UseG1GC -XX:+ExplicitGCInvokesConcurrent -XX:+VerifyBeforeGC -XX:+VerifyRememberedSets -Xmx4m A

Host: VM-232-99-centos, AMD EPYC 7K62 48-Core Processor, 16 cores, 31G, CentOS Linux release 8.2.2.2004 (Core)
Time: Fri Sep 24 14:21:40 2021 CST elapsed time: 0.054486 seconds (0d 0h 0m 0s)

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

Current thread (0x00007f30a415adc0): VMThread "VM Thread" [stack: 0x00007f308c870000,0x00007f308c970000] [id=1161119]

Stack: [0x00007f308c870000,0x00007f308c970000], sp=0x00007f308c96def0, free space=1015k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xb3ef72] HeapRegion::block_size(HeapWordImpl* const*) const+0x232
V [libjvm.so+0xccabb1] HeapRegion::verify_rem_set(VerifyOption, bool*) const+0x201
V [libjvm.so+0xccae37] HeapRegion::verify_rem_set() const+0x17
V [libjvm.so+0xb6a4ed] VerifyRegionRemSetClosure::do_heap_region(HeapRegion*)+0x3d
V [libjvm.so+0xcd7a39] HeapRegionManager::iterate(HeapRegionClosure*) const+0x159
V [libjvm.so+0xb6881a] G1CollectedHeap::verify_before_young_collection(G1HeapVerifier::G1VerifyType)+0x8a
V [libjvm.so+0xc2e662] G1YoungCollector::collect()+0x592
V [libjvm.so+0xb61e89] G1CollectedHeap::do_collection_pause_at_safepoint_helper(double)+0xe9
V [libjvm.so+0xb61fdb] G1CollectedHeap::do_collection_pause_at_safepoint(double)+0x9b
V [libjvm.so+0xc2b5ef] VM_G1TryInitiateConcMark::doit()+0xff
V [libjvm.so+0x1894cd7] VM_Operation::evaluate()+0x187
V [libjvm.so+0x18b99b8] VMThread::inner_execute(VM_Operation*)+0x348
V [libjvm.so+0x18ba433] VMThread::loop()+0x253
V [libjvm.so+0x18ba6cd] VMThread::run()+0xbd
V [libjvm.so+0x17bcbc8] Thread::call_run()+0xf8
V [libjvm.so+0x13c6be9] thread_native_entry(Thread*)+0x109

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