On 2021-11-12 22:21, Robert W wrote:
Hi,
I have recently tried to upgrade a system to run the 5.14 kernel and
noticed that I was getting hangs on the system which seem to relate to
this wireless dongle which I am running hostapd against to provide a
small AP. Since that time kernel 5.15 was released and I have tested
that kernel as well and the problem persists. The issue sometimes
occurs within an hour and other times it takes a few hours. I have tried
to narrow down what is causing the issue. I thought it might be a
change elsewhere outside the mac80211/driver area so I tried to run the
wireless backports 5.15-rc6 on top of the last stable kernel of 5.13 so
as to have the smallest number of changes on the system. The backports
crashes with the same error. I have included below the netconsole
output and the gdb of the kernel module in question. The capture was
from when I was using the backports, but the error is the same. I hope
the pastebins are okay to use on the list. I did try to get some
assistance on linux-wireless IRC and some one asked for the outputs I
had for the information so I am reusing them here.
The following pastebin is the data sent to a netconsole instance.
https://pastebin.com/UxRrTtUh
The gdb debug of the kernel module suggests this section of code.
https://pastebin.com/iMzxWEVU
I am able to run further tests if required. I am not a programmer, but
I can usually apply code patches and build the resulting code. Please
let me know if require any further information.
Please try this patch:
diff --git a/net/mac80211/tx.c b/net/mac80211/tx.c
index 278945e3e08a..e19f6e246642 100644
--- 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);
