D50049.diff
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	diff --git a/sys/dev/rtwn/usb/rtwn_usb_rx.c b/sys/dev/rtwn/usb/rtwn_usb_rx.c
	--- a/sys/dev/rtwn/usb/rtwn_usb_rx.c
	+++ b/sys/dev/rtwn/usb/rtwn_usb_rx.c
	@@ -124,10 +124,15 @@
	if (rtwn_rx_check_pre_alloc(sc, stat) != 0)
	goto fail;

	- m = m_get2(totlen, M_NOWAIT, MT_DATA, M_PKTHDR);
	+ /*
	+ * Note: this can require >4 KiB (eg de-aggregating an A-MSDU
	+ * from an USB frame. See kern/286366 for more information.
	+ */
	+ m = m_get3(totlen, M_NOWAIT, MT_DATA, M_PKTHDR);
	if (__predict_false(m == NULL)) {
	- device_printf(sc->sc_dev, "%s: could not allocate RX mbuf\n",
	- __func__);
	+ device_printf(sc->sc_dev,
	+ "%s: could not allocate RX mbuf (%d bytes)\n",
	+ __func__, totlen);
	goto fail;
	}