diff --git a/sys/compat/linuxkpi/common/include/linux/skbuff.h b/sys/compat/linuxkpi/common/include/linux/skbuff.h
index 341ed33ddfc..43f35d8f065 100644
--- a/sys/compat/linuxkpi/common/include/linux/skbuff.h
+++ b/sys/compat/linuxkpi/common/include/linux/skbuff.h
@@ -706,6 +706,8 @@ __skb_queue_purge(struct sk_buff_head *q)
 	SKB_TRACE(q);
         while ((skb = __skb_dequeue(q)) != NULL)
 		kfree_skb(skb);
+	WARN_ONCE(skb_queue_len(q) != 0, "%s: queue %p not empty: %u",
+	    __func__, q, skb_queue_len(q));
 }
 
 static inline void
diff --git a/sys/compat/linuxkpi/common/src/linux_80211.c b/sys/compat/linuxkpi/common/src/linux_80211.c
index 1d834673fa7..f695aa4cfc7 100644
--- a/sys/compat/linuxkpi/common/src/linux_80211.c
+++ b/sys/compat/linuxkpi/common/src/linux_80211.c
@@ -3854,7 +3854,22 @@ lkpi_80211_txq_tx_one(struct lkpi_sta *lsta, struct mbuf *m)
 	 */
 	skb = dev_alloc_skb(hw->extra_tx_headroom + m->m_pkthdr.len);
 	if (skb == NULL) {
-		ic_printf(ic, "ERROR %s: skb alloc failed\n", __func__);
+		static uint8_t skb_alloc_failures = 0;
+
+		if (skb_alloc_failures++ == 0) {
+			int tid;
+
+			sta = LSTA_TO_STA(lsta);
+			ic_printf(ic, "ERROR %s: skb alloc failed %d + %d, lsta %p sta %p ni %p\n",
+			    __func__, hw->extra_tx_headroom, m->m_pkthdr.len, lsta, sta, ni);
+			for (tid = 0; tid < nitems(sta->txq); tid++) {
+				if (sta->txq[tid] == NULL)
+					continue;
+				ltxq = TXQ_TO_LTXQ(sta->txq[tid]);
+				ic_printf(ic, "  tid %d ltxq %p seen_dequeue %d stopped %d skb_queue_len %u\n",
+				    tid, ltxq, ltxq->seen_dequeue, ltxq-> stopped, skb_queue_len(&ltxq->skbq));
+			}
+		}
 		ieee80211_free_node(ni);
 		m_freem(m);
 		return;