static void pdu_complete(V9fsPDU *pdu, ssize_t len)
{
    int8_t id = pdu->id + 1; /* Response */
    V9fsState *s = pdu->s;

    if (len < 0) {
        int err = -len;
        len = 7;

        if (s->proto_version != V9FS_PROTO_2000L) {
            V9fsString str;

            str.data = strerror(err);
            str.size = strlen(str.data);

            len += pdu_marshal(pdu, len, "s", &str);
            id = P9_RERROR;
        }

        len += pdu_marshal(pdu, len, "d", err);

        if (s->proto_version == V9FS_PROTO_2000L) {
            id = P9_RLERROR;
        }
        trace_v9fs_rerror(pdu->tag, pdu->id, err); /* Trace ERROR */
    }

    /* fill out the header */
    pdu_marshal(pdu, 0, "dbw", (int32_t)len, id, pdu->tag);

    /* keep these in sync */
    pdu->size = len;
    pdu->id = id;

    pdu_push_and_notify(pdu);

    /* Now wakeup anybody waiting in flush for this request */
    qemu_co_queue_next(&pdu->complete);

    pdu_free(pdu);
}

This vulnerability category highlights issues in resource management where failures to properly release memory, file handles, or other resources can degrade system performance or enable denial-of-service conditions.