OpenJDK java/lang/Thread/virtual/stress/PingPong timeout

[pshipton]

https://openj9-jenkins.osuosl.org/job/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/40
jdk_lang_j9_0
-Xdump:system:none -Xdump:heap:none -Xdump:system:events=gpf+abort+traceassert+corruptcache -XX:-JITServerTechPreviewMessage -Xjit -Xgcpolicy:balanced -Xnocompressedrefs
java/lang/Thread/virtual/stress/PingPong.java

20:59:29  Timeout information:
20:59:29  Running jcmd on process 2680997
20:59:29  Dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16821212678666/jdk_lang_j9_0/work/scratch/0/core.20230422.005853.2680997.0001.dmp
20:59:29  Dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16821212678666/jdk_lang_j9_0/work/scratch/0/javacore.20230422.005925.2680997.0002.txt
20:59:29  Running jstack on process 2680997
20:59:29  2023-04-22T00:59:26.449132873
20:59:29  Virtual machine: 2680997 JVM information:
20:59:29  JRE 20 Linux s390x-64-Bit 20230421_43 (JIT enabled, AOT enabled)
20:59:29  OpenJ9   - bf214ec2114
20:59:29  OMR      - 97cf2a6e860
20:59:29  JCL      - 38d10ea9b95 based on jdk-20+36
20:59:29  
20:59:29  "main" prio=5 Id=2 WAITING
20:59:29  	at java.base@20-internal/java.lang.Object.waitImpl(Native Method)
20:59:29  	at java.base@20-internal/java.lang.Object.wait(Object.java:255)
20:59:29  	at java.base@20-internal/java.lang.Object.wait(Object.java:221)
20:59:29  	at java.base@20-internal/java.lang.Thread.join(Thread.java:2147)
20:59:29  	at java.base@20-internal/java.lang.Thread.join(Thread.java:2223)
20:59:29  	at app//com.sun.javatest.regtest.agent.MainWrapper.main(MainWrapper.java:72)
20:59:29  
20:59:29  "JIT Compilation Thread-000" prio=10 Id=4 RUNNABLE
20:59:29  
20:59:29  "JIT Compilation Thread-001 Suspended" prio=10 Id=5 RUNNABLE
20:59:29  
20:59:29  "JIT Compilation Thread-002 Suspended" prio=10 Id=6 RUNNABLE
20:59:29  
20:59:29  "JIT Compilation Thread-003 Suspended" prio=10 Id=7 RUNNABLE
20:59:29  
20:59:29  "JIT Compilation Thread-004 Suspended" prio=10 Id=8 RUNNABLE
20:59:29  
20:59:29  "JIT Compilation Thread-005 Suspended" prio=10 Id=9 RUNNABLE
20:59:29  
20:59:29  "JIT Compilation Thread-006 Suspended" prio=10 Id=10 RUNNABLE
20:59:29  
20:59:29  "JIT Diagnostic Compilation Thread-007 Suspended" prio=10 Id=11 RUNNABLE
20:59:29  
20:59:29  "JIT-SamplerThread" prio=10 Id=12 TIMED_WAITING
20:59:29  
20:59:29  "IProfiler" prio=5 Id=13 RUNNABLE
20:59:29  
20:59:29  "Common-Cleaner" prio=8 Id=3 TIMED_WAITING
20:59:29  	at java.base@20-internal/java.lang.Object.waitImpl(Native Method)
20:59:29  	at java.base@20-internal/java.lang.Object.wait(Object.java:255)
20:59:29  	at java.base@20-internal/java.lang.Object.wait(Object.java:221)
20:59:29  	at java.base@20-internal/java.lang.ref.ReferenceQueue.remove(ReferenceQueue.java:137)
20:59:29  	at java.base@20-internal/jdk.internal.ref.CleanerImpl.run(CleanerImpl.java:140)
20:59:29  	at java.base@20-internal/java.lang.Thread.run(Thread.java:1639)
20:59:29  	at java.base@20-internal/jdk.internal.misc.InnocuousThread.run(InnocuousThread.java:186)
20:59:29  
20:59:29  "Dedicated GC Main" prio=5 Id=14 RUNNABLE
20:59:29  
20:59:29  "GC Worker" prio=5 Id=15 RUNNABLE
20:59:29  
20:59:29  "GC Worker" prio=5 Id=16 RUNNABLE
20:59:29  
20:59:29  "GC Worker" prio=5 Id=17 RUNNABLE
20:59:29  
20:59:29  "Attach API wait loop" prio=10 Id=20 RUNNABLE
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.IPC.waitSemaphore(Native Method)
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.CommonDirectory.waitSemaphore(CommonDirectory.java:264)
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.WaitLoop.waitForNotification(WaitLoop.java:66)
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.WaitLoop.run(WaitLoop.java:157)
20:59:29  
20:59:29  "MainThread" prio=5 Id=22 TIMED_WAITING
20:59:29  	at java.base@20-internal/jdk.internal.misc.Unsafe.park(Native Method)
20:59:29  	at java.base@20-internal/java.util.concurrent.locks.LockSupport.parkNanos(LockSupport.java:269)
20:59:29  	at java.base@20-internal/java.util.concurrent.locks.AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:756)
20:59:29  	at java.base@20-internal/java.util.concurrent.locks.AbstractQueuedSynchronizer.tryAcquireSharedNanos(AbstractQueuedSynchronizer.java:1126)
20:59:29  	at java.base@20-internal/java.util.concurrent.CountDownLatch.await(CountDownLatch.java:276)
20:59:29  	at java.base@20-internal/java.lang.VirtualThread.joinNanos(VirtualThread.java:816)
20:59:29  	at java.base@20-internal/java.lang.Thread.join(Thread.java:2261)
20:59:29  	at app//PingPong.main(PingPong.java:95)
20:59:29  	at java.base@20-internal/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
20:59:29  	at java.base@20-internal/java.lang.reflect.Method.invoke(Method.java:578)
20:59:29  	at app//com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:125)
20:59:29  	at java.base@20-internal/java.lang.Thread.run(Thread.java:1639)
20:59:29  
20:59:29  "Finalizer thread" prio=5 Id=29 RUNNABLE
20:59:29  
20:59:29  "file lock watchdog" prio=10 Id=31 TIMED_WAITING
20:59:29  	at java.base@20-internal/java.lang.Object.waitImpl(Native Method)
20:59:29  	at java.base@20-internal/java.lang.Object.wait(Object.java:255)
20:59:29  	at java.base@20-internal/java.lang.Object.wait(Object.java:221)
20:59:29  	at java.base@20-internal/java.util.TimerThread.mainLoop(Timer.java:599)
20:59:29  	at java.base@20-internal/java.util.TimerThread.run(Timer.java:542)
20:59:29  
20:59:29  "Attachment portNumber: 38697" prio=10 Id=33 RUNNABLE
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.DiagnosticUtils.dumpAllThreadsImpl(Native Method)
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.DiagnosticUtils.getThreadInfo(DiagnosticUtils.java:245)
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.DiagnosticUtils.executeDiagnosticCommand(DiagnosticUtils.java:181)
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.Attachment.doCommand(Attachment.java:248)
20:59:29  	at java.base@20-internal/openj9.internal.tools.attach.target.Attachment.run(Attachment.java:159)
20:59:29  
20:59:29  
20:59:29  --- Timeout information end.

20:59:29  STDOUT:
...
20:59:29  252617 252617
20:59:29  252617 252617
20:59:29  252617 252617
20:59:29  Timeout refired 960 times
20:59:29  252617 252617
20:59:29  252617 252617
20:59:29  252617 252617
...

[pshipton]

@fengxue-IS @babsingh @tajila fyi

[pshipton]

https://openj9-jenkins.osuosl.org/job/Test_openjdk20_j9_sanity.openjdk_s390x_linux_OpenJDK20/3/
https://openj9-jenkins.osuosl.org/job/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/41

[tajila]

There is a crash in https://openj9-jenkins.osuosl.org/job/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/41/consoleFull

02:59:12          -J-Dtest.class.path.prefix=/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/classes/1/java/lang/String/concat/ImplicitStringConcatShapes.d:/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/openjdk/openjdk-jdk/test/jdk/java/lang/String/concat \
02:59:12          -d /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/classes/1/java/lang/String/concat/ImplicitStringConcatShapes.d \
02:59:12          -sourcepath /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/openjdk/openjdk-jdk/test/jdk/java/lang/String/concat \
02:59:12          -classpath /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/openjdk/openjdk-jdk/test/jdk/java/lang/String/concat:/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/classes/1/java/lang/String/concat/ImplicitStringConcatShapes.d /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/openjdk/openjdk-jdk/test/jdk/java/lang/String/concat/ImplicitStringConcatShapes.java
02:59:12  stderr:
02:59:12  Unhandled exception
02:59:12  Type=Segmentation error vmState=0x00000000
02:59:12  J9Generic_Signal_Number=00000018 Signal_Number=0000000b Error_Value=000000a9 Signal_Code=00000001
02:59:12  Handler1=000003FFA73C48F8 Handler2=000003FFA72B1998 InaccessibleAddress=000000000002F000
02:59:12  gpr0=000003FFA060E200 gpr1=000003FF7C850DF0 gpr2=000003FF7CA50A18 gpr3=000003FF001219EF
02:59:12  gpr4=000000000000000D gpr5=000003FFA10CA1F0 gpr6=000003FF001219EF gpr7=000003FF7C850DF0
02:59:12  gpr8=0000000000030000 gpr9=000003FF7AE5D090 gpr10=000003FF7C85E0E8 gpr11=000003FF7C80D658
02:59:12  gpr12=000003FF001219EF gpr13=000003FFA0121600 gpr14=000003FF7C97FAC8 gpr15=000003FFA7F74320
02:59:12  psw=000003FF6123AB3C mask=0705100180000000 fpc=0048fe00 bea=000003FF61238AEA
02:59:12  fpr0 488df6b300000000 (f: 0.000000, d: 3.262755e+41)
02:59:12  fpr1 be18f00000000000 (f: 0.000000, d: -1.451554e-09)
02:59:12  fpr2 bddf6b3700000000 (f: 0.000000, d: -1.143010e-10)
02:59:12  fpr3 3dd064a800000000 (f: 0.000000, d: 5.963807e-11)
02:59:12  fpr4 3dd40d4840000000 (f: 1073741824.000000, d: 7.294833e-11)
02:59:12  fpr5 3f31720000000000 (f: 0.000000, d: 2.661943e-04)
02:59:12  fpr6 b17e5dbf00000000 (f: 0.000000, d: -2.749865e-70)
02:59:12  fpr7 0000000000000000 (f: 0.000000, d: 0.000000e+00)
02:59:12  fpr8 00000000123565a0 (f: 305489312.000000, d: 1.509318e-315)
02:59:12  fpr9 0000000000555b78 (f: 5593976.000000, d: 2.763791e-317)
02:59:12  fpr10 00000000123568a8 (f: 305490080.000000, d: 1.509322e-315)
02:59:12  fpr11 0000000000000000 (f: 0.000000, d: 0.000000e+00)
02:59:12  fpr12 0005fa238ee8101b (f: 2397573120.000000, d: 8.312188e-309)
02:59:12  fpr13 000003fef0043ce8 (f: 4026809600.000000, d: 2.170669e-311)
02:59:12  fpr14 0000000000555b80 (f: 5593984.000000, d: 2.763795e-317)
02:59:12  fpr15 000003fef0043da8 (f: 4026809856.000000, d: 2.170669e-311)
02:59:12  
02:59:12  Compiled_method=sun/nio/cs/UTF_8$Decoder.decodeArrayLoop(Ljava/nio/ByteBuffer;Ljava/nio/CharBuffer;)Ljava/nio/charset/CoderResult;
02:59:12  Target=2_90_20230425_44 (Linux 3.10.0-1160.83.1.el7.s390x)
02:59:12  CPU=s390x (4 logical CPUs) (0x1ec1b1000 RAM)
02:59:12  ----------- Stack Backtrace -----------
02:59:12   (0x000003FF6123AB3C [<unknown>+0x0])
02:59:12  ---------------------------------------
02:59:12  JVMDUMP039I Processing dump event "gpf", detail "" at 2023/04/25 02:58:43 - please wait.
02:59:12  JVMDUMP032I JVM requested System dump using '/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/core.20230425.025843.17925.0001.dmp' in response to an event
02:59:12  JVMDUMP010I System dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/core.20230425.025843.17925.0001.dmp
02:59:12  JVMDUMP032I JVM requested Java dump using '/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/javacore.20230425.025843.17925.0002.txt' in response to an event
02:59:12  Unhandled exception
02:59:12  Type=Segmentation error vmState=0x00000000
02:59:12  J9Generic_Signal_Number=00000018 Signal_Number=0000000b Error_Value=000000a9 Signal_Code=00000001
02:59:12  Handler1=000003FFA73C48F8 Handler2=000003FFA72B1998 InaccessibleAddress=0000000000000000
02:59:12  gpr0=0000000000000001 gpr1=0000000000000000 gpr2=0000000000000001 gpr3=000003FF04019E00
02:59:12  gpr4=0000000000000000 gpr5=000003FF7C962EC0 gpr6=000003FFA6CFDCD0 gpr7=000003FFA6CFDD89
02:59:12  gpr8=000000000000000A gpr9=000003FF7C962EB8 gpr10=000003FFA5AADD78 gpr11=000003FFA0015430
02:59:12  gpr12=000003FF609C6DE8 gpr13=000003FFA5CBC4E0 gpr14=000003FFA5AC30A0 gpr15=000003FFA6CFDA30
02:59:12  psw=000003FFA5AC30AC mask=0705200180000000 fpc=0008fe00 bea=000003FFA5AB3BFC
02:59:12  fpr0 428e5efe00000000 (f: 0.000000, d: 4.174167e+12)
02:59:12  fpr1 3e63917800000000 (f: 0.000000, d: 3.644868e-08)
02:59:12  fpr2 3e3ab28300000000 (f: 0.000000, d: 6.215952e-09)
02:59:12  fpr3 3c14bc0100000000 (f: 0.000000, d: 2.810034e-19)
02:59:12  fpr4 be386333a0287658 (f: 2687006208.000000, d: -5.678159e-09)
02:59:12  fpr5 3e924b1c00000000 (f: 0.000000, d: 2.725928e-07)
02:59:12  fpr6 3ecccf3400000040 (f: 64.000000, d: 3.434347e-06)
02:59:12  fpr7 3e3a365700000000 (f: 0.000000, d: 6.103019e-09)
02:59:12  fpr8 000003ffa7423568 (f: 2806134016.000000, d: 2.172188e-311)
02:59:12  fpr9 0000000000555b78 (f: 5593976.000000, d: 2.763791e-317)
02:59:12  fpr10 000003ffa0015430 (f: 2684441600.000000, d: 2.172128e-311)
02:59:12  fpr11 0000000000000000 (f: 0.000000, d: 0.000000e+00)
02:59:12  fpr12 0005fa238ee8101b (f: 2397573120.000000, d: 8.312188e-309)
02:59:12  fpr13 000003fef0043ce8 (f: 4026809600.000000, d: 2.170669e-311)
02:59:12  fpr14 0000000000555b80 (f: 5593984.000000, d: 2.763795e-317)
02:59:12  fpr15 000003fef0043da8 (f: 4026809856.000000, d: 2.170669e-311)
02:59:12  Module=/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/openjdkbinary/j2sdk-image/lib/default/libj9gc_full29.so
02:59:12  Module_base_address=000003FFA5A80000
02:59:12  Target=2_90_20230425_44 (Linux 3.10.0-1160.83.1.el7.s390x)
02:59:12  CPU=s390x (4 logical CPUs) (0x1ec1b1000 RAM)
02:59:12  ----------- Stack Backtrace -----------
02:59:12   (0x000003FFA5AC30AC [libj9gc_full29.so+0x430ac])
02:59:12  comparatorToEqualFn+0x28 (0x000003FFA5CA6790 [libj9gc_full29.so+0x226790])
02:59:12  hashTableFind+0xbe (0x000003FFA5CA74C6 [libj9gc_full29.so+0x2274c6])
02:59:12  _ZN14MM_StringTable6hashAtEmP8J9Object+0x2e (0x000003FFA5AC49C6 [libj9gc_full29.so+0x449c6])
02:59:12  _ZN14MM_StringTable10hashAtUTF8EmPhmj+0x32 (0x000003FFA5AC4A1A [libj9gc_full29.so+0x44a1a])
02:59:12  j9gc_createJavaLangString+0xf7c (0x000003FFA5AC608C [libj9gc_full29.so+0x4608c])
02:59:12  resolveStringRef+0x10a (0x000003FFA7403F32 [libj9vm29.so+0x83f32])
02:59:12  _ZN26VM_BytecodeInterpreterFull3runEP10J9VMThread+0x2fa54 (0x000003FFA748FEF4 [libj9vm29.so+0x10fef4])
02:59:12  bytecodeLoopFull+0xee (0x000003FFA746048E [libj9vm29.so+0xe048e])
02:59:12  c_cInterpreter+0x64 (0x000003FFA752CF04 [libj9vm29.so+0x1acf04])
02:59:12  ---------------------------------------
02:59:12  JVMDUMP039I Processing dump event "gpf", detail "" at 2023/04/25 02:58:55 - please wait.
02:59:12  JVMDUMP032I JVM requested System dump using '/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/core.20230425.025855.17925.0003.dmp' in response to an event
02:59:12  JVMDUMP010I Java dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/javacore.20230425.025843.17925.0002.txt
02:59:12  JVMDUMP010I System dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/core.20230425.025855.17925.0003.dmp
02:59:12  JVMDUMP032I JVM requested Java dump using '/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/javacore.20230425.025855.17925.0005.txt' in response to an event
02:59:12  JVMDUMP032I JVM requested Snap dump using '/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/Snap.20230425.025843.17925.0004.trc' in response to an event
02:59:12  JVMDUMP010I Java dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/javacore.20230425.025855.17925.0005.txt
02:59:12  JVMDUMP010I Snap dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/Snap.20230425.025843.17925.0004.trc
02:59:12  JVMDUMP032I JVM requested JIT dump using '/home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/jitdump.20230425.025843.17925.0007.dmp' in response to an event
02:59:12  JVMDUMP051I JIT dump occurred in 'main' thread 0x000003FFA0121600
02:59:12  JVMDUMP053I JIT dump is recompiling sun/nio/cs/UTF_8$Decoder.decodeArrayLoop(Ljava/nio/ByteBuffer;Ljava/nio/CharBuffer;)Ljava/nio/charset/CoderResult;
02:59:12  JVMDUMP053I JIT dump is recompiling com/sun/tools/javac/main/JavaCompiler.readSource(Ljavax/tools/JavaFileObject;)Ljava/lang/CharSequence;
02:59:12  JVMDUMP052I JIT dump recursive crash occurred on diagnostic thread
02:59:12  JVMDUMP053I JIT dump is recompiling com/sun/tools/javac/main/JavaCompiler.compile(Ljava/util/Collection;Ljava/util/Collection;Ljava/lang/Iterable;Ljava/util/Collection;)V
02:59:12  JVMDUMP052I JIT dump recursive crash occurred on diagnostic thread
02:59:12  JVMDUMP053I JIT dump is recompiling com/sun/javatest/regtest/agent/RegressionCompileCommand.run([Ljava/lang/String;Ljava/io/PrintWriter;Ljava/io/PrintWriter;)Lcom/sun/javatest/regtest/agent/AStatus;
02:59:12  JVMDUMP010I JIT dump written to /home/jenkins/workspace/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/aqa-tests/TKG/output_16824043581126/jdk_lang_j9_0/work/scratch/0/jitdump.20230425.025843.17925.0007.dmp
02:59:12  JVMDUMP013I Processed dump event "gpf", detail "".
02:59:12  
02:59:12  TEST RESULT: Error. Agent communication error: java.io.EOFException; check console log for any additional details
02:59:12  --------------------------------------------------
03:16:31  TEST: java/lang/Thread/virtual/stress/PingPong.java#sq

[tajila]

Ignore the previous post, its unrelated.

[pshipton]

We have a different PR for that crash, which is #17203

The PingPong test didn't crash, it timed out. The output for the test is below 03:16:31 TEST: java/lang/Thread/virtual/stress/PingPong.java#sq

[pshipton]

https://openj9-jenkins.osuosl.org/job/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/43

[tajila]

Does this only fail with balanced GC? All the links I've looked at are only balanced

[pshipton]

Yes probably, we never saw it before. The jdk_lang_j9 target to test balanced was only recently added.

[pshipton]

https://openj9-jenkins.osuosl.org/job/Test_openjdk20_j9_sanity.openjdk_s390x_linux_Nightly/45

[tajila]

@LinHu2016 Please take a look/ FYI @fengxue-IS

[LinHu2016]

Investigating the timeout
1, could not reproduce the timeout issue locally(x86_64_linux), looks like it is platform specific issue( so far all of reported issues are on zlinux).
2,check from core dump file, there were only two virtual threads, both of them were unmounted(not finished), there were neither STW GC nor concurrent GC active,
3, check test src code, looks like both virtual threads only could be unmounted during queue.take() and should be waked up(mount) by another virtual thread queue.transfer("xxx"), expect there would be 10,000,000 mount/umount for each virtual thread, but after 252617 cycles both virtual threads has been unmounted, and never mount back...
4, so far haven't found any balanced GC actions could cause the situation.