static void xhci_event(XHCIState *xhci, XHCIEvent *event, int v)
{
    XHCIInterrupter *intr;
    dma_addr_t erdp;
    unsigned int dp_idx;

    if (v >= xhci->numintrs) {
        DPRINTF("intr nr out of range (%d >= %d)\n", v, xhci->numintrs);
        return;
    }
    intr = &xhci->intr[v];

    if (intr->er_full) {
        DPRINTF("xhci_event(): ER full, queueing\n");
        if (((intr->ev_buffer_put+1) % EV_QUEUE) == intr->ev_buffer_get) {
            DPRINTF("xhci: event queue full, dropping event!\n");
            return;
        }
        intr->ev_buffer[intr->ev_buffer_put++] = *event;
        if (intr->ev_buffer_put == EV_QUEUE) {
            intr->ev_buffer_put = 0;
        }
        return;
    }

    erdp = xhci_addr64(intr->erdp_low, intr->erdp_high);
    if (erdp < intr->er_start ||
        erdp >= (intr->er_start + TRB_SIZE*intr->er_size)) {
        DPRINTF("xhci: ERDP out of bounds: "DMA_ADDR_FMT"\n", erdp);
        DPRINTF("xhci: ER[%d] at "DMA_ADDR_FMT" len %d\n",
                v, intr->er_start, intr->er_size);
        xhci_die(xhci);
        return;
    }

    dp_idx = (erdp - intr->er_start) / TRB_SIZE;
    assert(dp_idx < intr->er_size);

    if ((intr->er_ep_idx+1) % intr->er_size == dp_idx) {
        DPRINTF("xhci_event(): ER full, queueing\n");
#ifndef ER_FULL_HACK
        XHCIEvent full = {ER_HOST_CONTROLLER, CC_EVENT_RING_FULL_ERROR};
        xhci_write_event(xhci, &full);
#endif
        intr->er_full = 1;
        if (((intr->ev_buffer_put+1) % EV_QUEUE) == intr->ev_buffer_get) {
            DPRINTF("xhci: event queue full, dropping event!\n");
            return;
        }
        intr->ev_buffer[intr->ev_buffer_put++] = *event;
        if (intr->ev_buffer_put == EV_QUEUE) {
            intr->ev_buffer_put = 0;
        }
    } else {
        xhci_write_event(xhci, event, v);
    }

    xhci_intr_raise(xhci, v);
}

The product contains an iteration or loop with an exit condition that cannot be reached, i.e., an infinite loop.