The following test failed in the JDK15 CI:

runtime/cds/appcds/TestCombinedCompressedFlags.java

Here's a snippet from the log file:

----------System.err:(37/2865)----------
 stdout: [[0.029s][info][cds] trying to map /scratch/mesos/slaves/63712a43-4eaa-429c-95b4-483ac8241123-S967/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c0e03a36-df3d-4d97-a0b1-b7750f4d7d4f/runs/bbd72368-d6ac-41ec-9aee-71db9aff29f8/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_cds_relocation/scratch/0/appcds-12h07m30s740.jsa
[0.029s][info][cds] Opened archive /scratch/mesos/slaves/63712a43-4eaa-429c-95b4-483ac8241123-S967/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c0e03a36-df3d-4d97-a0b1-b7750f4d7d4f/runs/bbd72368-d6ac-41ec-9aee-71db9aff29f8/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_cds_relocation/scratch/0/appcds-12h07m30s740.jsa.
[0.029s][info][cds] Archive was created with UseCompressedOops = 1, UseCompressedClassPointers = 0
# To suppress the following error report, specify this argument
# after -XX: or in .hotspotrc:  SuppressErrorAt=/virtualMemoryTracker.cpp:388
#
# A fatal error has been detected by the Java Runtime Environment:
#
#  Internal Error (/scratch/mesos/slaves/63712a43-4eaa-429c-95b4-483ac8241123-S952/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/8586a222-ab15-48b7-939b-a336daeb3311/runs/a01d24ca-8cee-4a7a-b16e-0fe72e00abfe/workspace/open/src/hotspot/share/services/virtualMemoryTracker.cpp:388), pid=85867, tid=8963
#  Error: ShouldNotReachHere()
#
# JRE version:  (15.0+27) (fastdebug build )
# Java VM: Java HotSpot(TM) 64-Bit Server VM (fastdebug 15-ea+27-1336, mixed mode, sharing, tiered, compressed oops, g1 gc, bsd-amd64)
# Core dump will be written. Default location: core.85867
#
# An error report file with more information is saved as:
# /scratch/mesos/slaves/63712a43-4eaa-429c-95b4-483ac8241123-S967/frameworks/1735e8a2-a1db-478c-8104-60c8b0af87dd-0196/executors/c0e03a36-df3d-4d97-a0b1-b7750f4d7d4f/runs/bbd72368-d6ac-41ec-9aee-71db9aff29f8/testoutput/test-support/jtreg_open_test_hotspot_jtreg_hotspot_cds_relocation/scratch/0/hs_err_pid85867.log
#
#
];
 stderr: []
 exitValue = 134

java.lang.RuntimeException: 'Hello World' missing from stdout/stderr 

	at jdk.test.lib.process.OutputAnalyzer.shouldContain(OutputAnalyzer.java:189)
	at TestCombinedCompressedFlags.main(TestCombinedCompressedFlags.java:178)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
	at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.base/java.lang.reflect.Method.invoke(Method.java:564)
	at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:298)
	at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: java.lang.RuntimeException
JavaTest Message: shutting down test

result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: 'Hello World' missing from stdout/stderr


test result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: 'Hello World' missing from stdout/stderr


Here's the crashing thread's stack:

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

Current thread (0x00007ff503018030):  JavaThread "Unknown thread" [_thread_in_vm, id=8963, stack(0x000000010a678000,0x000000010a778000)]

Stack: [0x000000010a678000,0x000000010a778000],  sp=0x000000010a7771e0,  free space=1020k
Native frames: (J=compiled Java code, A=aot compiled Java code, j=interpreted, Vv=VM code, C=native code)
V  [libjvm.dylib+0x109341d]  VMError::report_and_die(int, char const*, char const*, __va_list_tag*, Thread*, unsigned char*, void*, void*, char const*, int, unsigned long)+0x6ed
V  [libjvm.dylib+0x1093b51]  VMError::report_and_die(Thread*, void*, char const*, int, char const*, char const*, __va_list_tag*)+0x41
V  [libjvm.dylib+0x563d22]  report_vm_error(char const*, int, char const*, char const*, ...)+0x142
V  [libjvm.dylib+0x1085a96]  VirtualMemoryTracker::add_reserved_region(unsigned char*, unsigned long, NativeCallStack const&, MemoryType)+0x5c6
V  [libjvm.dylib+0xdaf57b]  os::map_memory(int, char const*, unsigned long, char*, unsigned long, bool, bool, MemoryType)+0x12b
V  [libjvm.dylib+0x638a2a]  FileMapInfo::map_region(int, long, char*, ReservedSpace)+0x1da
V  [libjvm.dylib+0x638550]  FileMapInfo::map_regions(int*, int, char*, ReservedSpace)+0x90
V  [libjvm.dylib+0xcfde00]  MetaspaceShared::map_archive(FileMapInfo*, char*, ReservedSpace)+0xb0
V  [libjvm.dylib+0xcfd1b0]  MetaspaceShared::map_archives(FileMapInfo*, FileMapInfo*, bool)+0x330
V  [libjvm.dylib+0xcfcab2]  MetaspaceShared::initialize_runtime_shared_and_meta_spaces()+0x112
V  [libjvm.dylib+0xcf097b]  Metaspace::global_initialize()+0x6b
V  [libjvm.dylib+0x10274f2]  universe_init()+0x1a2
V  [libjvm.dylib+0x7d77b4]  init_globals()+0x74
V  [libjvm.dylib+0xff5dd8]  Threads::create_vm(JavaVMInitArgs*, bool*)+0x388
V  [libjvm.dylib+0x9040cb]  JNI_CreateJavaVM+0x8b
C  [libjli.dylib+0x4472]  JavaMain+0x122
C  [libjli.dylib+0x7599]  ThreadJavaMain+0x9
C  [libsystem_pthread.dylib+0x3661]  _pthread_body+0x154
C  [libsystem_pthread.dylib+0x350d]  _pthread_body+0x0
C  [libsystem_pthread.dylib+0x2bf9]  thread_start+0xd