#vulnerable code 
                                boolean replaceEntry(long hash, long oldHashEntryAdr, long newHashEntryAdr, long bytes)
    {
        LongArrayList derefList = null;

        lock.lock();
        try
        {
            long prevEntryAdr = 0L;
            for (long hashEntryAdr = table.getFirst(hash);
                 hashEntryAdr != 0L;
                 prevEntryAdr = hashEntryAdr, hashEntryAdr = HashEntries.getNext(hashEntryAdr))
            {
                if (hashEntryAdr != oldHashEntryAdr)
                    continue;

                // remove existing entry

                replaceInternal(oldHashEntryAdr, prevEntryAdr, newHashEntryAdr);

                while (freeCapacity < bytes)
                {
                    long eldestHashAdr = removeEldest();
                    if (eldestHashAdr == 0L)
                    {
                        return false;
                    }
                    if (derefList == null)
                        derefList = new LongArrayList();
                    derefList.add(eldestHashAdr);
                }

                return true;
            }

            return false;
        }
        finally
        {
            lock.unlock();

            if (derefList != null)
                for (int i = 0; i < derefList.size(); i++)
                    HashEntries.dereference(derefList.getLong(i));
        }
    } 
                            #location 43 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                                OffHeapMap(OHCacheBuilder builder, long freeCapacity)
    {
        this.freeCapacity = freeCapacity;

        this.throwOOME = builder.isThrowOOME();

        this.lock = builder.isUnlocked() ? null : new ReentrantLock();

        int hts = builder.getHashTableSize();
        if (hts <= 0)
            hts = 8192;
        if (hts < 256)
            hts = 256;
        table = Table.create((int) Util.roundUpToPowerOf2(hts, MAX_TABLE_SIZE), throwOOME);
        if (table == null)
            throw new RuntimeException("unable to allocate off-heap memory for segment");

        float lf = builder.getLoadFactor();
        if (lf <= .0d)
            lf = .75f;
        this.loadFactor = lf;
        threshold = (long) ((double) table.size() * loadFactor);
    }