In WT-9903, a debug mode was added to allocate new memory on every realloc call to realloc_func. In that change, code was added to copy to the new memory, overwrite the old memory and then free it. That code should use the standard wt_overwrite_and_free* family of macros to replace this code:

        memset((uint8_t *)tmpp, WT_DEBUG_BYTE, bytes_allocated);
        free(tmpp);