CAS operation fails in readMarshallable()

Hi, please check this code example:

    public void testCAS() {
        final File dir = getTmpDir();
        try (final SingleChronicleQueue queue = SingleChronicleQueueBuilder.binary(dir)
                .build()) {
            final ExcerptAppender appender = queue.acquireAppender();
            final ExcerptTailer tailer = queue.createTailer();
            final WriteBytesMarshallable writeBytesMarshallable = bytes -> bytes.writeLong(123L);
            final ReadBytesMarshallable readBytesMarshallable = bytes -> bytes.compareAndSwapLong(bytes.readPosition(), 123L, 321L);

            final int iterations = 5; // fails at 5th iteration
            for (int i = 0; i < iterations; i++) {
                appender.writeBytes(writeBytesMarshallable);
                tailer.readBytes(readBytesMarshallable);
            }
        }
    }

It fails with exception:

net.openhft.chronicle.core.util.MisAlignedAssertionError at net.openhft.chronicle.core.UnsafeMemory.compareAndSwapLong(UnsafeMemory.java:983) at net.openhft.chronicle.bytes.internal.NativeBytesStore.compareAndSwapLong(NativeBytesStore.java:342) at net.openhft.chronicle.bytes.MappedBytesStore.compareAndSwapLong(MappedBytesStore.java:187) at net.openhft.chronicle.bytes.internal.ChunkedMappedBytes.compareAndSwapLong(ChunkedMappedBytes.java:607) at net.openhft.chronicle.queue.AcquireReleaseTest.lambda$testCAS$5(AcquireReleaseTest.java:147) at net.openhft.chronicle.wire.MarshallableIn.readBytes(MarshallableIn.java:69) at net.openhft.chronicle.queue.AcquireReleaseTest.testCAS(AcquireReleaseTest.java:152)

I guess it is somehow connected with padding/alignment. There were some changes in Chronicle Core library, addressing padding. My environment is Intel Macbook Pro 2013, Oracle JDK 1.8.0_201. Currently we are using 5.21ea44 in production, there is no such problem.

[garikjan]

Sorry, I was wrong. To be more precise, I am testing at commit 161dda49bed41df9bdc0e36a261ce2dadcd29611 of ea branch.

[peter-lawrey]

Can we close this?