JVMTI SuspendThread/suspendthrd03 Fails

[babsingh]

With OpenJ9, the failure is intermittent in JDK19. On some occassions, the test passes with OpenJ9 when the rerun: command is used.

This test passes with the RI. This test only deals with platform threads so it is unrelated to Project Loom. This failure will presumably be seen with JDK8/11/17 as well.

Related: #16187.

Issue(s)

OpenJ9 does not support the below cmdline option. But this is not the root cause of the failure.

JVMJ9VM007W Command-line option unrecognised: -Xlog:thread+smr=debug

The root of cause of the failure is related to the below log output:

Debuggee status sync aborted because agent thread has finished

I believe that there is a synchronization issue which will need to be further triaged.

Test CMD

make test TEST="jtreg:test/hotspot/jtreg/serviceability/jvmti/thread/SuspendThread/suspendthrd03/suspendthrd03.java" JTREG="JAVA_OPTIONS=--enable-preview -Dvm.continuations=true;VERBOSE=all"

Failure Test Output

STDOUT:
Starting TestedThread #0.
Starting tested thread
Sync: thread started
Synchronization point checkStatus(0) called.
Data 0x7f33f40a67d8 0x7f33d0002ad8
Wait for thread to start
Find thread: TestedThread
  ... found thread: 0x7f33f409dc08
Suspend thread: 0x7f33f409dc08
Let thread to run and finish
Get state vector for thread: 0x7f33f409dc08
  ... got state vector:  ALIVE RUNNABLE SUSPENDED (1048581)
Resume thread: 0x7f33f409dc08
INFO: Late suspend thread: 0x7f33f409dc08
INFO: Late resume thread: 0x7f33f409dc08
<-- REPEATED MANY TIMES -->
INFO: Late suspend thread: 0x7f33f409dc08
INFO: Late resume thread: 0x7f33f409dc08
Finishing tested thread
INFO: Late suspend thread: 0x7f33f409dc08
INFO: Late resume thread: 0x7f33f409dc08
<-- REPEATED MANY TIMES -->
INFO: Late suspend thread: 0x7f33f409dc08
INFO: Late resume thread: 0x7f33f409dc08
Sync: thread finished
Synchronization point checkStatus(0) called.
Data 0x7f33f40a67d8 0x7f33d0002ad8
Debuggee status sync aborted because agent thread has finished
STDERR:
JVMJ9VM007W Command-line option unrecognised: -Xlog:thread+smr=debug

Correct/Expected Test Output

...
INFO: Late resume thread: 0x7fa9e009dd08
INFO: Late suspend thread: 0x7fa9e009dd08
INFO: Late suspend thread err: 15
INFO: made 12 late calls to JVM/TI SuspendThread()
INFO: N_LATE_CALLS == 10000 value is large enough to cause a SuspendThread() call after thread exit.
Wait for thread to finish
Sync: thread finished
Synchronization point checkStatus(0) called.
Data 0x7fa9e00a6898 0x7fa9bc002ad8
Delete thread reference
Let debugee to finish

[babsingh]

Closing: SuspendThread/suspendthrd03 has been removed in JDK20 extension repo. Also, the test has been removed from JDK20's test exclude list in adoptium/aqa-tests#4554.