Array accesses using sun.misc.Unsafe cause data corruption or SIGSEGV (original) (raw)

Tue Jun 9 10:07:22 UTC 2015

public static void main(String[] args) throws Exception {
        Unsafe unsafe = findUnsafe();
        // 10000 pass
        // 100000 jvm crash
        // 1000000 fail
        int count = 100000;
        long size = count * 8L;
        long baseAddress = unsafe.allocateMemory(size);

        try {
            for (int i = 0; i < count; i++) {
                long address = baseAddress + (i * 8L);

                long expected = i;
                unsafe.putLong(address, expected);

                long actual = unsafe.getLong(address);

                if (expected != actual) {
                    throw new AssertionError("Expected: " + expected + ",
Actual: " + actual);
                }
            }
        } finally {
            unsafe.freeMemory(baseAddress);
        }
    }

Array accesses using sun.misc.Unsafe cause data corruption or SIGSEGV (original) (raw)

Thanks, -Mehmet Dogan-