Babneet Singh

Update jvmtiHelper.c::getVMThread to support Virtual Threads

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Signed-off-by: Babneet Singh

Support virtual threads in JVMTI Resume* and Suspend* functions

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This PR impacts the following JVMTI functions: - [Resume|Suspend]Thread - [Resume|Suspend]ThreadList - [Resume|Suspend]AllVirtualThreads - GetThreadState The above functions have been either implemented or updated as per the JVMTI doc: https://download.java.net/java/early_access/jdk19/docs/specs/jvmti.html...

Avoid unsteady states during JVMTI Suspend and Resume All VThreads

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For VThreads, the `mount` and `unmount` phases are unsteady states since a `J9VMThread` is modified during these phases. JVMTI `[Suspend|Resume]AllVirtualThreads` acquire exclusive VM access. This can pause the virtual threads...

jdk22 WrapperHiddenClassTest::testModule segfault in libj9gc

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https://openj9-jenkins.osuosl.org/job/Test_openjdk22_j9_sanity.openjdk_aarch64_linux_Personal_testList_1/1 jdk_lang java/lang/invoke/MethodHandleProxies/WrapperHiddenClassTest.java ``` 16:33:41 STARTED WrapperHiddenClassTest::testModule '[2] interface java.lang.Runnable' 16:33:41 Unhandled exception 16:33:41 Type=Segmentation error vmState=0x00000000 16:33:41 J9Generic_Signal_Number=00000018 Signal_Number=0000000b Error_Value=00000000 Signal_Code=00000001 16:33:41 Handler1=0000FFFF8F8C3314 Handler2=0000FFFF8F827B60 InaccessibleAddress=0000000000000008 16:33:41 R0=0000000000000001 R1=0000000000000000 R2=0000FFFF88033FB0...

jdk22 serviceability jvmti FilteredFieldsTest: declaredCount != jvmtiCount: 0 != 1

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https://openj9-jenkins.osuosl.org/job/Test_openjdk22_j9_extended.openjdk_aarch64_linux_Personal/1 serviceability_jvmti_j9_0 serviceability_jvmti_j9_1 serviceability/jvmti/GetClassFields/FilteredFields/FilteredFieldsTest.java ``` 16:28:25 STDOUT: 16:28:25 Class.getDeclaredFields reported 0 fields: 16:28:25 GetClassFields returned 1 fields: 16:28:25 [0]: constantPoolOop 16:28:25 STDERR: 16:28:25 java.lang.Exception: declaredCount != jvmtiCount: 0 != 1...

Add a Mockito Testcase

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There are two OpenJ9 user issues where a crash with Mockito is reported: - https://github.com/eclipse-openj9/openj9/issues/18750 - https://github.com/eclipse-openj9/openj9/issues/18781 The Mockito test case will help us identify the above crashes in our...

Grinder links from the console output don't work

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There are two sets of links to launch grinders: - the first set is in test job's home/summary page (these still work); and - the second set is in the...

Disclaim ROM and RAM classes during checkpoint

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Disclaiming classes during checkpoint will lead to less memory usage during restore since all class memory might not be needed during restore. New JVM option: `-XX:[+|-]CRIUDisclaimClasses` Enabling new tracepoint: `-Xtrace:print={j9vm.760}`

A segfault was observed with `-verbose:stackwalk=0` in #19744 where `walkState->userData4` was `NULL`.

Restore MemberName on stack for linkTo* methods after PopFrame

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OJDK MH INLs: `linkToStaticSpecial`, `linkToVirtual` and `linkToInterface` pop the top element from the stack before executing the target method. The top element is an instance of `MemberName`. These native INLs...