[AOT] OOM compiling jdk.internal.module.SystemModules.descriptors()

AOT compiling java.base with 4gb heap now shows OOM message:

Error: Failed compilation: jdk.internal.module.SystemModules.descriptors()[Ljava/lang/module/ModuleDescriptor;: java.lang.OutOfMemoryError: Java heap space:

Even compiling just one this method without profiling code (no --compile-for-tiered) it OOM with 2Gb heap.

$ cat cmd.txt
compileOnly jdk.internal.module.SystemModules.descriptors()[Ljava/lang/module/ModuleDescriptor;

$ $JAVA_HOME/bin/jaotc -J-Xmx2g --info --compile-commands cmd.txt --output a.so --module java.base
Compiling a...
5714 classes found (1317 ms)
54288 methods total, 1 methods to compile (1177 ms)
Compiling with 4 threads
.Error: Failed compilation: jdk.internal.module.SystemModules.descriptors()[Ljava/lang/module/ModuleDescriptor;: java.lang.OutOfMemoryError: Java heap space

0 methods compiled, 1 methods failed (70153 ms)

Stack trace printed with --verbose shows:

.Error: Failed compilation: jdk.internal.module.SystemModules.descriptors()[Ljava/lang/module/ModuleDescriptor;: java.lang.OutOfMemoryError: Java heap space
java.lang.OutOfMemoryError: Java heap space
at java.base/java.util.BitSet.initWords(BitSet.java:167)
at java.base/java.util.BitSet.<init>(BitSet.java:162)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.alloc.lsra.LinearScanLifetimeAnalysisPhase.computeLocalLiveSets(LinearScanLifetimeAnalysisPhase.java:243)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.alloc.lsra.LinearScanLifetimeAnalysisPhase.run(LinearScanLifetimeAnalysisPhase.java:88)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.alloc.lsra.LinearScanLifetimeAnalysisPhase.run(LinearScanLifetimeAnalysisPhase.java:73)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.phases.LIRPhase.apply(LIRPhase.java:111)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.phases.LIRPhase.apply(LIRPhase.java:104)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.alloc.lsra.LinearScan.allocate(LinearScan.java:659)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.alloc.lsra.LinearScanPhase.run(LinearScanPhase.java:46)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.alloc.lsra.LinearScanPhase.run(LinearScanPhase.java:33)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.phases.LIRPhase.apply(LIRPhase.java:111)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.phases.LIRPhase.apply(LIRPhase.java:104)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.phases.LIRPhaseSuite.run(LIRPhaseSuite.java:89)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.phases.LIRPhase.apply(LIRPhase.java:111)
at jdk.internal.vm.compiler/org.graalvm.compiler.lir.phases.LIRPhase.apply(LIRPhase.java:104)
at jdk.internal.vm.compiler/org.graalvm.compiler.core.GraalCompiler.emitLowLevel(GraalCompiler.java:330)
at jdk.internal.vm.compiler/org.graalvm.compiler.core.GraalCompiler.emitLIR0(GraalCompiler.java:302)
at jdk.internal.vm.compiler/org.graalvm.compiler.core.GraalCompiler.emitLIR(GraalCompiler.java:252)
at jdk.internal.vm.compiler/org.graalvm.compiler.core.GraalCompiler.emitBackEnd(GraalCompiler.java:233)
at jdk.internal.vm.compiler/org.graalvm.compiler.core.GraalCompiler.compile(GraalCompiler.java:179)
at jdk.internal.vm.compiler/org.graalvm.compiler.core.GraalCompiler.compileGraph(GraalCompiler.java:164)
at jdk.aot/jdk.tools.jaotc.AOTBackend.compileGraph(AOTBackend.java:135)
at jdk.aot/jdk.tools.jaotc.AOTBackend.compileMethod(AOTBackend.java:103)
at jdk.aot/jdk.tools.jaotc.AOTCompilationTask.run(AOTCompilationTask.java:117)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1161)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
at java.base/java.lang.Thread.run(Thread.java:844)

Igor, can you verify that it is Graal issue and not AOT. And pass to labs to investigate.