static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp,
                                   V9fsQID *qidp)
{
    struct stat stbuf;
    int err;

    err = v9fs_co_lstat(pdu, &fidp->path, &stbuf);
    if (err < 0) {
        return err;
    }
    stat_to_qid(&stbuf, qidp);
    return 0;
}

The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.