The following test failed in the JDK16 CI:

applications/dacapo/Dacapo24H.java

Here's a snippet from the log file:

[stress.process.err] Failing node: 311 CallStaticJavaDirect === 4157 2533 2534 21 0 63 2530 24 25 63 26 27 197 2537 0 0 0 0 0 0 0 0 2537 63 2537 2537 25 2509 26 2538 314 313 63 [[ 312 310 2543 2545 2546 ]] Static org.h2.mvstore.db.MVSecondaryIndex::convertToSearchRow # org/h2/result/SearchRow * ( org/h2/mvstore/db/MVSecondaryIndex:NotNull *, org/h2/value/ValueArray * ) MVSecondaryIndex$MVStoreCursor::getSearchRow @ bci:26 MVSecondaryIndex$MVStoreCursor::next @ bci:56 ConstraintReferential::existsRow @ bci:30 !jvms: ValueLong::get @ bci:26 MVSecondaryIndex::convertToKey @ bci:87 MVSecondaryIndex::find @ bci:2 MVSecondaryIndex::find @ bci:5 ConstraintReferential::existsRow @ bci:21
[stress.process.err] # To suppress the following error report, specify this argument
[stress.process.err] # after -XX: or in .hotspotrc: SuppressErrorAt=/gcm.cpp:276
[stress.process.err] # [ timer expired, abort... ]
Unexpected exception Connection reset during communication. Check process module status.
================================================================================

Here's snippets from the hs_err_pid file:

# Internal Error (/opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S27827/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/9e102465-cc2d-465b-827e-db202f69a076/runs/5d37edf7-96ca-4b4b-a4cc-5e5c0b202fbc/workspace/open/src/hotspot/share/opto/gcm.cpp:276), pid=5019, tid=26249
# assert(false) failed: unscheduable graph
#
# JRE version: Java(TM) SE Runtime Environment (16.0+23) (fastdebug build 16-ea+23-1373)
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 16-ea+23-1373, mixed mode, sharing, tiered, compressed oops, g1 gc, linux-amd64)
# Problematic frame:
# V [libjvm.so+0xcf83d2] assert_dom(Block*, Block*, Node*, PhaseCFG const*)+0x1b2

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

Current thread (0x00007ffabafeac00): JavaThread "C2 CompilerThread1" daemon [_thread_in_native, id=26249, stack(0x00007ffae53e3000,0x00007ffae54e4000)]


Current CompileTask:
C2:61267963 3975590 4 org.h2.constraint.ConstraintReferential::existsRow (174 bytes)

Stack: [0x00007ffae53e3000,0x00007ffae54e4000], sp=0x00007ffae54dee10, free space=1007k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V [libjvm.so+0xcf83d2] assert_dom(Block*, Block*, Node*, PhaseCFG const*)+0x1b2
V [libjvm.so+0xcf9b48] PhaseCFG::schedule_early(VectorSet&, Node_Stack&)+0x588
V [libjvm.so+0xd02161] PhaseCFG::global_code_motion()+0x281
V [libjvm.so+0xd061f1] PhaseCFG::do_global_code_motion()+0x51
V [libjvm.so+0x9f46f0] Compile::Code_Gen()+0x290
V [libjvm.so+0x9fe203] Compile::Compile(ciEnv*, ciMethod*, int, bool, bool, bool, bool, DirectiveSet*)+0x1a33
V [libjvm.so+0x83d3ee] C2Compiler::compile_method(ciEnv*, ciMethod*, int, bool, DirectiveSet*)+0x1ce
V [libjvm.so+0xa0e258] CompileBroker::invoke_compiler_on_method(CompileTask*)+0xe08
V [libjvm.so+0xa0eda8] CompileBroker::compiler_thread_loop()+0x5a8
V [libjvm.so+0x1859386] JavaThread::thread_main_inner()+0x256
V [libjvm.so+0x1860050] Thread::call_run()+0x100
V [libjvm.so+0x1551b16] thread_native_entry(Thread*)+0x116

VM Arguments:
jvm_args: -Xbootclasspath/a:/opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/wb.jar -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI -XX:MaxRAMPercentage=6 -Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/tmp -da:edu.cmu.graphchi... -da:java.util.logging... -XX:MaxRAMPercentage=50 -Djava.vm.version=1.14.0 -Djava.awt.headless=true -XX:+HeapDumpOnOutOfMemoryError -XX:+CrashOnOutOfMemoryError -XX:+DisplayVMOutputToStderr -Xlog:gc*,gc+heap=debug:gc.log:uptime,timemillis,level,tags -XX:+DisableExplicitGC -XX:+StartAttachListener --illegal-access=deny --add-opens=java.base/java.io=ALL-UNNAMED --add-opens=java.base/sun.nio.ch=ALL-UNNAMED --add-opens=java.base/java.lang=ALL-UNNAMED --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED --add-opens=java.base/java.net=ALL-UNNAMED -Djava.io.tmpdir=/opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/java.io.tmpdir -Duser.home=/opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/user.home -agentpath:/opt/mach5/mesos/work_dir/jib-master/install/jdk-16+23-1373/linux-x64-debug.test/hotspot/jtreg/native/libJvmtiStressModule.so -XX:NativeMemoryTracking=detail -Djdk.test.lib.random.seed=7886031339819370300
java_command: applications.kitchensink.process.stress.Main /opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/kitchensink.final.properties
java_class_path (initial): /opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/classes/0/applications/dacapo/Dacapo24H.d:/opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/0.jar:/opt/mach5/mesos/work_dir/slaves/47535081-0322-4d83-bb78-f7e11abb86d0-S45925/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/b9bc65df-781b-43a1-af3f-cd1f1545eab0/runs/605d05d4-a661-451d-bdd8-b6ad0f38581a/testoutput/test-support/jtreg_closed_test_hotspot_jtreg_applications_dacapo_Dacapo24H_java/scratch/0/1.jar:/opt/mach5/mesos/work_dir/jib-master/download/org/dacapo/309e1fa/dacapo-309e1fa.jar
Launcher Type: SUN_STANDARD

[Global flags]
     intx CICompilerCount = 4 {product} {ergonomic} Number of compiler threads to run
     uint ConcGCThreads = 2 {product} {ergonomic} Number of threads concurrent gc will use
     bool CrashOnOutOfMemoryError = true {product} {command line} JVM aborts, producing an error log and core/mini dump, on the first occurrence of an out-of-memory error
     bool DisableExplicitGC = true {product} {command line} Ignore calls to System.gc()
     bool DisplayVMOutputToStderr = true {product} {command line} If DisplayVMOutput is true, display all VM output to stderr
     bool DisplayVMOutputToStdout = false {product} {command line} If DisplayVMOutput is true, display all VM output to stdout
     bool FlightRecorder = true {product} {management} (Deprecated) Enable Flight Recorder
     uint G1ConcRefinementThreads = 8 {product} {ergonomic} The number of parallel rem set update threads. Will be set ergonomically by default.
   size_t G1HeapRegionSize = 8388608 {product} {ergonomic} Size of the G1 regions.
    uintx GCDrainStackTargetSize = 64 {product} {ergonomic} Number of entries we will try to leave on the stack during parallel gc
     bool HeapDumpOnOutOfMemoryError = true {manageable} {command line} Dump heap to file when java.lang.OutOfMemoryError is thrown
   size_t InitialHeapSize = 528482304 {product} {ergonomic} Initial heap size (in bytes); zero means use ergonomics
   size_t MarkStackSize = 4194304 {product} {ergonomic} Size of marking stack
   size_t MaxHeapSize = 16726884352 {product} {ergonomic} Maximum heap size (in bytes)
   size_t MaxNewSize = 10032775168 {product} {ergonomic} Maximum new generation size (in bytes), max_uintx means set ergonomically
 uint64_t MaxRAM = 33444835328 {pd product} {ergonomic} Real memory size (in bytes) used to set maximum heap size
   double MaxRAMPercentage = 50.000000 {product} {command line} Maximum percentage of real memory used for maximum heap size
   size_t MinHeapDeltaBytes = 8388608 {product} {ergonomic} The minimum change in heap space due to GC (in bytes)
   size_t MinHeapSize = 8388608 {product} {ergonomic} Minimum heap size (in bytes); zero means use ergonomics
    ccstr NativeMemoryTracking = detail {product} {command line} Native memory tracking options
    uintx NonNMethodCodeHeapSize = 5839372 {pd product} {ergonomic} Size of code heap with non-nmethods (in bytes)
    uintx NonProfiledCodeHeapSize = 122909434 {pd product} {ergonomic} Size of code heap with non-profiled methods (in bytes)
    uintx ProfiledCodeHeapSize = 122909434 {pd product} {ergonomic} Size of code heap with profiled methods (in bytes)
    uintx ReservedCodeCacheSize = 251658240 {pd product} {ergonomic} Reserved code cache size (in bytes) - maximum code cache size
     bool SegmentedCodeCache = true {product} {ergonomic} Use a segmented code cache
   size_t SoftMaxHeapSize = 16726884352 {manageable} {ergonomic} Soft limit for maximum heap size (in bytes)
     bool StartAttachListener = true {product} {command line} Always start Attach Listener at VM startup
     bool UnlockDiagnosticVMOptions = true {diagnostic} {command line} Enable normal processing of flags relating to field diagnostics
     bool UseCompressedClassPointers = true {product lp64_product} {ergonomic} Use 32-bit class pointers in 64-bit VM. lp64_product means flag is always constant in 32 bit VM
     bool UseCompressedOops = true {product lp64_product} {ergonomic} Use 32-bit object references in 64-bit VM. lp64_product means flag is always constant in 32 bit VM
     bool UseG1GC = true {product} {ergonomic} Use the Garbage-First garbage collector
     bool WhiteBoxAPI = true {diagnostic} {command line} Enable internal testing APIs