message: use 190 instead of 0
diff: @@ -429,7 +429,7 @@ void BufferManager::VerifyZeroReaders(shared_ptr<BlockHandle> &handle) {
  auto replacement_buffer = make_unique<FileBuffer>(Allocator::Get(db), handle->buffer->type,
  handle->memory_usage - Storage::BLOCK_HEADER_SIZE);
  memcpy(replacement_buffer->buffer, handle->buffer->buffer, handle->buffer->size);
  - memset(handle->buffer->buffer, 0, handle->buffer->size);
  + memset(handle->buffer->buffer, 190, handle->buffer->size);
  handle->buffer = move(replacement_buffer);
  #endif
  }
  