Re: [BISECTED REGRESSION] Wireless networking kernel crashes

[Felix Fietkau]

On 2021-11-18 14:25, Aaro Koskinen wrote:
> Hello,
>
> I have tried to upgrade my wireless AP (Raspberry Pi with rt2x00usb)
> from v5.9 to the current mainline, but now it keeps crashing every hour
> or so, basically making my wireless network unusable.
>
> I have bisected this to:
>
> commit 03c3911d2d67a43ad4ffd15b534a5905d6ce5c59
> Author: Ryder Lee <ryder.lee@xxxxxxxxxxxx>
> Date:   Thu Jun 17 18:31:12 2021 +0200
>
>      mac80211: call ieee80211_tx_h_rate_ctrl() when dequeue
>
> With the previous commit the system stays up for weeks...
>
> I just tried today's mainline, and it crashed after 10 minutes:
Please test if this patch fixes the issue:

---
--- a/net/mac80211/tx.c
+++ b/net/mac80211/tx.c
@@ -1822,15 +1822,15 @@ static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
 	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 	ieee80211_tx_result res = TX_CONTINUE;
 
+	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
+		CALL_TXH(ieee80211_tx_h_rate_ctrl);
+
 	if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
 		__skb_queue_tail(&tx->skbs, tx->skb);
 		tx->skb = NULL;
 		goto txh_done;
 	}
 
-	if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
-		CALL_TXH(ieee80211_tx_h_rate_ctrl);
-
 	CALL_TXH(ieee80211_tx_h_michael_mic_add);
 	CALL_TXH(ieee80211_tx_h_sequence);
 	CALL_TXH(ieee80211_tx_h_fragment);