gc/stringdedup/TestStringDeduplicationFullGC.java#Parallel failed with "RuntimeException: String verification failed"

The following test failed in the JDK19 CI:

gc/stringdedup/TestStringDeduplicationFullGC.java#Parallel

Here's a snippet from the log file:

[0.715s][debug][stringdedup,phases,start] Idle start
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
Verifying strings: total=10000, uniqueFound=10000, uniqueExpected=5000
Deduplication not completed, waiting...
[14.129s][info ][gc,heap,exit ] Heap
[14.129s][info ][gc,heap,exit ] PSYoungGen total 45056K, used 6226K [0x00000000fce00000, 0x0000000100000000, 0x0000000100000000)
[14.129s][info ][gc,heap,exit ] eden space 38912K, 16% used [0x00000000fce00000,0x00000000fd4149c8,0x00000000ff400000)
[14.129s][info ][gc,heap,exit ] from space 6144K, 0% used [0x00000000ff400000,0x00000000ff400000,0x00000000ffa00000)
[14.129s][info ][gc,heap,exit ] to space 6144K, 0% used [0x00000000ffa00000,0x00000000ffa00000,0x0000000100000000)
[14.129s][info ][gc,heap,exit ] ParOldGen total 51200K, used 1644K [0x00000000f9c00000, 0x00000000fce00000, 0x00000000fce00000)
[14.129s][info ][gc,heap,exit ] object space 51200K, 3% used [0x00000000f9c00000,0x00000000f9d9b2f0,0x00000000fce00000)
[14.129s][info ][gc,heap,exit ] Metaspace used 515K, committed 704K, reserved 1114112K
[14.130s][info ][gc,heap,exit ] class space used 30K, committed 128K, reserved 1048576K
[14.133s][info ][gc,verify,start ] Verifying
[14.192s][info ][gc,verify ] Verifying 59.286ms
];
 stderr: [Exception in thread "main" java.lang.RuntimeException: String verification failed
at gc.stringdedup.TestStringDeduplicationTools.verifyStrings(TestStringDeduplicationTools.java:261)
at gc.stringdedup.TestStringDeduplicationTools$DeduplicationTest.main(TestStringDeduplicationTools.java:298)
]
 exitValue = 1

java.lang.RuntimeException: Expected to get exit value of [0]

at jdk.test.lib.process.OutputAnalyzer.shouldHaveExitValue(OutputAnalyzer.java:489)
at gc.stringdedup.TestStringDeduplicationTools.testFullGC(TestStringDeduplicationTools.java:437)
at gc.stringdedup.TestStringDeduplicationFullGC.main(TestStringDeduplicationFullGC.java:94)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:577)
at com.sun.javatest.regtest.agent.MainActionHelper$AgentVMRunnable.run(MainActionHelper.java:312)
at java.base/java.lang.Thread.run(Thread.java:828)

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

result: Failed. Execution failed: `main' threw exception: java.lang.RuntimeException: Expected to get exit value of [0]