The following test failed in the JDK16 CI:

sun/hotspot/whitebox/CPUInfoTest.java

Here's a snippet from the log file:

#section:main
----------messages:(4/292)----------
command: main -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI CPUInfoTest
reason: User specified action: run main/othervm -Xbootclasspath/a:. -XX:+UnlockDiagnosticVMOptions -XX:+WhiteBoxAPI CPUInfoTest
Mode: othervm [/othervm specified]
elapsed time (seconds): 0.639
----------configuration:(0/0)----------
----------System.out:(4/1046)----------
WB.getCPUFeatures(): "(16 cores per cpu, 2 threads per core) family 23 model 1 stepping 2 microcode 0x1000065, cx8, cmov, fxsr, ht, mmx, 3dnowpref, sse, sse2, sse3, ssse3, sse4a, sse4.1, sse4.2, popcnt, lzcnt, tsc, avx, avx2, aes, clmul, bmi1, bmi2, adx, sha, fma, vzeroupper, clflush, clflushopt, hv"
CPUInfo.getAdditionalCPUInfo(): "(16 cores per cpu, 2 threads per core) family 23 model 1 stepping 2 microcode 0x1000065"
CPUInfo.getFeatures(): [cx8, cmov, fxsr, ht, mmx, 3dnowpref, sse, sse2, sse3, ssse3, sse4a, sse4.1, sse4.2, popcnt, lzcnt, tsc, avx, avx2, aes, clmul, bmi1, bmi2, adx, sha, fma, vzeroupper, clflush, clflushopt, hv]
Well-known CPU features: [avx512vl, avx512dq, avx2, avx512f, fxsr, mmx, sse4a, sse3, sse2, avx512_vnni, avx512pf, tsc, aes, avx512_vpclmulqdq, avx512_vbmi2, vzeroupper, sse4.2, sse4.1, bmi2, bmi1, sha, avx, ht, tscinvbit, lzcnt, popcnt, clflushopt, mmxext, fma, adx, cx8, avx512cd, tscinv, erms, clmul, sse, rtm, 3dnowpref, avx512bw, clwb, avx512_vpopcntdq, cmov, avx512er, avx512_vaes, ssse3, clflush]
----------System.err:(15/1011)----------
java.lang.RuntimeException: not all features are known: expected true, was false
at jdk.test.lib.Asserts.fail(Asserts.java:594)
at jdk.test.lib.Asserts.assertTrue(Asserts.java:486)
at CPUInfoTest.main(CPUInfoTest.java:78)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:564)
at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
at java.base/java.lang.Thread.run(Thread.java:832)

JavaTest Message: Test threw exception: java.lang.RuntimeException: not all features are known: expected true, was false
JavaTest Message: shutting down test

STATUS:Failed.`main' threw exception: java.lang.RuntimeException: not all features are known: expected true, was false
----------rerun:(44/5459)*----------