java.lang.RuntimeException: '\\[0x[0]*7f7dc4043000 - 0x[0]*7f7dc4083000\\] reserved 256KB for Test' missing from stdout/stderr (reserve 2: addr2=140178135986176)
at VirtualAllocTestType.main(VirtualAllocTestType.java:149)
at java.base/jdk.internal.reflect.DirectMethodHandleAccessor.invoke(DirectMethodHandleAccessor.java:104)
at java.base/java.lang.reflect.Method.invoke(Method.java:565)
at com.sun.javatest.regtest.agent.MainWrapper$MainTask.run(MainWrapper.java:138)
at java.base/java.lang.Thread.run(Thread.java:1474)

What we do see in the log is:

[0x00007f7dc4003000 - 0x00007f7dc4083000] reserved 512KB for Test from
    [0x00007f7de2833832]WB_NMTReserveMemory+0xf2 (preserveException.hpp:64)
    [0x00007f7dcbca2f1a]