This test has been seen on SBR runs - but the logs give little by way of what the actual issue might be !!!

----------System.out:(2320/97758)----------
[TestNG] Running:
  java/foreign/TestHandshake.java

ITERATION 0
Starting handshaker with delay set to 199 millis
Accessor #21 suspending - delay (ms): 459
Accessor #41 suspending - delay (ms): 453
Accessor #1 suspending - delay (ms): 438
Accessor #35 suspending - delay (ms): 459
Accessor #32 suspending - delay (ms): 439
Accessor #5 suspending - delay (ms): 438
Accessor #28 suspending - delay (ms): 443
Accessor #20 suspending - delay (ms): 459
Accessor #39 suspending - delay (ms): 442
Accessor #50 suspending - delay (ms): 443
Accessor #29 suspending - delay (ms): 453
Accessor #43 suspending - delay (ms): 443
Accessor #37 suspending - delay (ms): 452
Accessor #27 suspending - delay (ms): 459
Accessor #46 suspending - delay (ms): 443
Accessor #31 suspending - delay (ms): 459
Accessor #34 suspending - delay (ms): 459
Accessor #40 suspending - delay (ms): 438
Accessor #11 suspending - delay (ms): 459
Accessor #18 suspending - delay (ms): 443
Accessor #0 suspending - delay (ms): 439
Accessor #7 suspending - delay (ms): 459
Accessor #26 suspending - delay (ms): 443
Accessor #48 suspending - delay (ms): 459
Accessor #25 suspending - delay (ms): 443
Accessor #2 suspending - delay (ms): 438
Accessor #12 suspending - delay (ms): 439
Accessor #38 suspending - delay (ms): 443
Accessor #17 suspending - delay (ms): 438
Accessor #49 suspending - delay (ms): 440
Accessor #22 suspending - delay (ms): 453
Accessor #47 suspending - delay (ms): 453
Accessor #23 suspending - delay (ms): 443
Accessor #16 suspending - delay (ms): 440
Accessor #44 suspending - delay (ms): 443
Accessor #3 suspending - delay (ms): 438
Accessor #9 suspending - delay (ms): 438
Accessor #8 suspending - delay (ms): 438
Accessor #40 resuming - delay (ms): 478
Accessor #30 suspending - delay (ms): 438
Accessor #14 suspending - delay (ms): 438
Accessor #15 suspending - delay (ms): 438
Accessor #19 suspending - delay (ms): 438
Accessor #36 suspending - delay (ms): 443
Accessor #24 suspending - delay (ms): 440
Accessor #6 suspending - delay (ms): 459
Accessor #10 suspending - delay (ms): 438
Accessor #4 suspending - delay (ms): 438
Accessor #42 suspending - delay (ms): 453
Accessor #13 suspending - delay (ms): 438
Accessor #40 terminated - delay (ms): 480
Accessor #51 suspending - delay (ms): 459
Accessor #43 resuming - delay (ms): 482
Accessor #43 terminated - delay (ms): 482
Accessor #44 resuming - delay (ms): 482
Accessor #44 terminated - delay (ms): 482
Accessor #45 suspending - delay (ms): 438
Accessor #33 suspending - delay (ms): 438
Segment closed - delay (ms): 477

<deleted log output>

Accessor #7 resuming - delay (ms): 606
Accessor #7 terminated - delay (ms): 606
Accessor #35 resuming - delay (ms): 606
Accessor #35 terminated - delay (ms): 606
Accessor #37 resuming - delay (ms): 608
Accessor #37 t

...
Output overflow:
JT Harness has limited the test output to the text
at the beginning and the end, so that you can see how the
test began, and how it completed.

If you need to see more of the output from the test,
set the system property javatest.maxOutputSize to a higher
value. The current value is 100000
...

d - delay (ms): 623
Accessor #45 resuming - delay (ms): 623
Accessor #45 terminated - delay (ms): 623
Accessor #22 resuming - delay (ms): 624
Accessor #22 terminated - delay (ms): 624
Accessor #23 resuming - delay (ms): 627
Accessor #23 terminated - delay (ms): 627
Accessor #7 resuming - delay (ms): 629

<deleted line of log output>

Accessor #38 resuming - delay (ms): 1474
Accessor #38 terminated - delay (ms): 1474
Accessor #0 resuming - delay (ms): 1485
Accessor #0 terminated - delay (ms): 1485
Accessor #16 resuming - delay (ms): 1493
Accessor #16 terminated - delay (ms): 1493
Accessor #41 resuming - delay (ms): 1498
Accessor #41 terminated - delay (ms): 1498
Accessor #43 resuming - delay (ms): 1500
Accessor #43 terminated - delay (ms): 1500
Accessor #19 resuming - delay (ms): 1500
Accessor #19 terminated - delay (ms): 1500
test TestHandshake.testHandshake("BufferHandleAccessor", TestHandshake$$Lambda$36/0x0000000800c22e88@7ce830a3): success

===============================================
java/foreign/TestHandshake.java
Total tests run: 6, Failures: 0, Skips: 0
===============================================


===============================================
java/foreign/TestHandshake.java
Total tests run: 6, Failures: 0, Skips: 0
===============================================

----------System.err:(2/73)----------
WARNING: Using incubator modules: jdk.incubator.foreign
STATUS:Passed.
----------rerun:(42/3473)*----------
cd 'C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\scratch\\0' && \\
JDK8_HOME=C:/users/opc/sandbox_keepme/jdk8 \\
JTREG_HOME=C:/users/opc/sandbox_keepme/jtreg \\
JTREG_JAVA=C:/users/opc/sandbox_keepme/stable_jdk/bin/java \\
JTREG_SHOWAGENT=true \\
PATH='C:\\cygwin64\\usr\\local\\bin;C:\\cygwin64\\bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0;C:\\Users\\opc\\AppData\\Local\\Microsoft\\WindowsApps' \\
SystemDrive=C: \\
SystemRoot='C:\\Windows' \\
TEMP='C:\\cygwin64\\tmp' \\
TMP='C:\\cygwin64\\tmp' \\
TZ=Etc/GMT \\
windir='C:\\Windows' \\
CLASSPATH='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d;C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign;C:\\Users\\opc\\sandbox_keepme\\jtreg\\lib\\testng.jar;C:\\Users\\opc\\sandbox_keepme\\jtreg\\lib\\javatest.jar;C:\\Users\\opc\\sandbox_keepme\\jtreg\\lib\\jtreg.jar' \\
    'C:\\users\\opc\\sandbox_keepme\\jdk\\bin\\java' \\
        -Dtest.vm.opts='-ea -esa -Xmx512m -XX:MaxRAMPercentage=1 -Dtest.nss.lib.paths=C:/users/opc/sandbox_keepme/nsslib/' \\
        -Dtest.tool.vm.opts='-J-ea -J-esa -J-Xmx512m -J-XX:MaxRAMPercentage=1 -J-Dtest.nss.lib.paths=C:/users/opc/sandbox_keepme/nsslib/' \\
        -Dtest.compiler.opts= \\
        -Dtest.java.opts= \\
        -Dtest.jdk='C:\\users\\opc\\sandbox_keepme\\jdk' \\
        -Dcompile.jdk='C:\\users\\opc\\sandbox_keepme\\jdk' \\
        -Dtest.timeout.factor=10.0 \\
        -Dtest.nativepath='C:\\users\\opc\\sandbox_keepme\\testBundle\\jdk\\jtreg\\native' \\
        -Dtest.root='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk' \\
        -Dtest.name=java/foreign/TestHandshake.java \\
        -Dtest.file='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign\\TestHandshake.java' \\
        -Dtest.src='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign' \\
        -Dtest.src.path='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign' \\
        -Dtest.classes='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d' \\
        -Dtest.class.path='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d' \\
        -Dtest.class.path.prefix='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d;C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign' \\
        -Dtest.modules='jdk.incubator.foreign java.base/jdk.internal.vm.annotation java.base/jdk.internal.misc' \\
        --add-modules jdk.incubator.foreign,java.base \\
        --add-exports java.base/jdk.internal.vm.annotation=ALL-UNNAMED \\
        --add-exports java.base/jdk.internal.misc=ALL-UNNAMED \\
        -ea \\
        -esa \\
        -Xmx512m \\
        -XX:MaxRAMPercentage=1 \\
        -Dtest.nss.lib.paths=C:/users/opc/sandbox_keepme/nsslib/ \\
        '-Djava.library.path=C:\\users\\opc\\sandbox_keepme\\testBundle\\jdk\\jtreg\\native' \\
        -Xint \\
        com.sun.javatest.regtest.agent.MainWrapper 'C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\java\\foreign\\TestHandshake.d\\testng.1.jta' java/foreign/TestHandshake.java false TestHandshake
result: Passed. Execution successful

#section:build
----------messages:(3/99)----------
command: build TestHandshake
reason: Named class compiled on demand
elapsed time (seconds): 0.0
result: Passed. All files up to date

#section:testng
----------messages:(5/411)----------
command: testng -XX:TieredStopAtLevel=1 TestHandshake
reason: User specified action: run testng/othervm -XX:TieredStopAtLevel=1 TestHandshake
Mode: othervm [/othervm specified]
Additional options from @modules: --add-modules jdk.incubator.foreign,java.base --add-exports java.base/jdk.internal.vm.annotation=ALL-UNNAMED --add-exports java.base/jdk.internal.misc=ALL-UNNAMED
elapsed time (seconds): 40.963
----------configuration:(5/198)----------
Boot Layer
  add modules: jdk.incubator.foreign java.base
  add exports: java.base/jdk.internal.misc ALL-UNNAMED
               java.base/jdk.internal.vm.annotation ALL-UNNAMED

----------System.out:(1649/69752)----------
[TestNG] Running:
  java/foreign/TestHandshake.java

ITERATION 0
Starting handshaker with delay set to 290 millis
Segment closed - delay (ms): 1306
Accessor #45 suspending - delay (ms): 1302
Accessor #9 suspending - delay (ms): 1300
Accessor #25 suspending - delay (ms): 1299
Accessor #48 suspending - delay (ms): 1302
Accessor #30 suspending - delay (ms): 1302
Accessor #15 suspending - delay (ms): 1302
Accessor #7 suspending - delay (ms): 1299
Accessor #38 suspending - delay (ms): 1302
Accessor #10 suspending - delay (ms): 1302
Accessor #37 suspending - delay (ms): 1299
Accessor #22 suspending - delay (ms): 1302
Accessor #39 suspending - delay (ms): 1302
Accessor #34 suspending - delay (ms): 1302
Accessor #17 suspending - delay (ms): 1299
Accessor #40 suspending - delay (ms): 1300
Accessor #33 suspending - delay (ms): 1299
Accessor #29 suspending - delay (ms): 1302
Accessor #13 suspending - delay (ms): 1300
Accessor #36 suspending - delay (ms): 1302

<deleted line>

Accessor #5 terminated - delay (ms): 434
Accessor #26 resuming - delay (ms): 440
Accessor #26 terminated - delay (ms): 440
Accessor #31 resuming - delay (ms): 443
Accessor #31 terminated - delay (ms): 443
Accessor #45 resuming - delay (ms): 444
Accessor #45 terminated - delay (ms): 444
Accessor #51 resuming - delay (ms): 444
Accessor #51 terminated - delay (ms): 444
Accessor #12 resuming - delay (ms): 450
Accessor #12 terminated - delay (ms): 450
Accessor #11 resuming - delay (ms): 450
Accessor #11 terminated - delay (ms): 450
test TestHandshake.testHandshake("BufferHandleAccessor", TestHandshake$$Lambda$37/0x0000000800c23618@7cc898d4): success

===============================================
java/foreign/TestHandshake.java
Total tests run: 6, Failures: 1, Skips: 0
===============================================

----------System.err:(15/929)----------
WARNING: Using incubator modules: jdk.incubator.foreign
java.lang.Exception: failures: 1
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:96)
at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:54)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:78)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:567)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:831)

JavaTest Message: Test threw exception: java.lang.Exception: failures: 1
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.Exception: failures: 1
----------rerun:(42/3491)*----------
cd 'C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\scratch\\0' && \\
JDK8_HOME=C:/users/opc/sandbox_keepme/jdk8 \\
JTREG_HOME=C:/users/opc/sandbox_keepme/jtreg \\
JTREG_JAVA=C:/users/opc/sandbox_keepme/stable_jdk/bin/java \\
JTREG_SHOWAGENT=true \\
PATH='C:\\cygwin64\\usr\\local\\bin;C:\\cygwin64\\bin;C:\\Windows\\system32;C:\\Windows;C:\\Windows\\System32\\Wbem;C:\\Windows\\System32\\WindowsPowerShell\\v1.0;C:\\Users\\opc\\AppData\\Local\\Microsoft\\WindowsApps' \\
SystemDrive=C: \\
SystemRoot='C:\\Windows' \\
TEMP='C:\\cygwin64\\tmp' \\
TMP='C:\\cygwin64\\tmp' \\
TZ=Etc/GMT \\
windir='C:\\Windows' \\
CLASSPATH='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d;C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign;C:\\Users\\opc\\sandbox_keepme\\jtreg\\lib\\testng.jar;C:\\Users\\opc\\sandbox_keepme\\jtreg\\lib\\javatest.jar;C:\\Users\\opc\\sandbox_keepme\\jtreg\\lib\\jtreg.jar' \\
    'C:\\users\\opc\\sandbox_keepme\\jdk\\bin\\java' \\
        -Dtest.vm.opts='-ea -esa -Xmx512m -XX:MaxRAMPercentage=1 -Dtest.nss.lib.paths=C:/users/opc/sandbox_keepme/nsslib/' \\
        -Dtest.tool.vm.opts='-J-ea -J-esa -J-Xmx512m -J-XX:MaxRAMPercentage=1 -J-Dtest.nss.lib.paths=C:/users/opc/sandbox_keepme/nsslib/' \\
        -Dtest.compiler.opts= \\
        -Dtest.java.opts= \\
        -Dtest.jdk='C:\\users\\opc\\sandbox_keepme\\jdk' \\
        -Dcompile.jdk='C:\\users\\opc\\sandbox_keepme\\jdk' \\
        -Dtest.timeout.factor=10.0 \\
        -Dtest.nativepath='C:\\users\\opc\\sandbox_keepme\\testBundle\\jdk\\jtreg\\native' \\
        -Dtest.root='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk' \\
        -Dtest.name=java/foreign/TestHandshake.java \\
        -Dtest.file='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign\\TestHandshake.java' \\
        -Dtest.src='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign' \\
        -Dtest.src.path='C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign' \\
        -Dtest.classes='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d' \\
        -Dtest.class.path='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d' \\
        -Dtest.class.path.prefix='C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\classes\\2\\java\\foreign\\TestHandshake.d;C:\\Users\\opc\\sandbox_keepme\\testbase\\open\\test\\jdk\\java\\foreign' \\
        -Dtest.modules='jdk.incubator.foreign java.base/jdk.internal.vm.annotation java.base/jdk.internal.misc' \\
        --add-modules jdk.incubator.foreign,java.base \\
        --add-exports java.base/jdk.internal.vm.annotation=ALL-UNNAMED \\
        --add-exports java.base/jdk.internal.misc=ALL-UNNAMED \\
        -ea \\
        -esa \\
        -Xmx512m \\
        -XX:MaxRAMPercentage=1 \\
        -Dtest.nss.lib.paths=C:/users/opc/sandbox_keepme/nsslib/ \\
        '-Djava.library.path=C:\\users\\opc\\sandbox_keepme\\testBundle\\jdk\\jtreg\\native' \\
        -XX:TieredStopAtLevel=1 \\
        com.sun.javatest.regtest.agent.MainWrapper 'C:\\Users\\opc\\sandbox_keepme\\results\\run_7\\tier1\\JTwork\\test_jdk_0\\java\\foreign\\TestHandshake.d\\testng.2.jta' java/foreign/TestHandshake.java false TestHandshake
result: Failed. Execution failed: `main' threw exception: java.lang.Exception: failures: 1


test result: Failed. Execution failed: `main' threw exception: java.lang.Exception: failures: 1