Hi, I'm new here so I apologize ahead of time if this is a known issue. In my defense, I did a quick search on the archives. My client machine (running wireless-testing kernel updated with git today) panics when connecting to a hostapd access point (also running ath9k) only when 802.11n is enabled on the access point. More specifically, here is the hostapd configuration that causes the client to crash: ieee80211n=0 ht_capab=[HT40+][SHORT-GI-40][DSSS_CCK-40] If I disable 802.11n on the access point everything works ok. Interesting enough, access point machine never crashes. At one point both access point and client machine ran identical code and client would always crash while the access point box would stay up. So upgraded client to the latest and greatest and tried a few versions in between, this panic has been very consistent. It always panics right after 1st attempt to associate. I was able to narrow down the panic to this assert ath_rc_ratefind_ht() in rc.c: ASSERT((rate_table->info[rate].valid && !ath_rc_priv->single_stream) || (rate_table->info[rate].valid_single_stream && ath_rc_priv->single_stream)); When I ifdef'ed this assert panic went away and everything sort of worked (haven't tested it heavily), but the performance dropped to about 700Kbps. I usually get 10x when 802.11n is off and there is no panic. Has anyone else seen this? I'm not including panic printk's because several routines get inlined so panic printout points to the ath_get_rate(), but if you disass that at the right offset you'll see the trap instruction and I'm pretty sure I am barking up the right assert here :) Here is the lspci output: 0c:00.0 Network controller [0280]: Atheros Communications, Inc. Unknown device [168c:002a] (rev 01) This client is a dell E1705 laptop with mini-pcie. -- Regards, Vladimir -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html