I'm pretty clueless on this, but as a single data point, my Archer C7 has abt 21 days of uptime now, since my last update, as the single router in a 4 person household. I've been running cake/piece of cake the whole time. Standard disclaimers apply as to clueless user not knowing if his FW version has anything to do with the issue in question, or if its connected to other things like whatever is going on with the airtime fairness. But the comment in the third paragraph sounded interesting in light of my lack of a crash and running a SQM method, FWIW. My last update was a sysupgrade to LEDE Reboot SNAPSHOT r2687-dc5f496 pretty sure date was 12-27-16. Today's Topics: 1. Fwd: [PATCH] mac80211: prevent skb/txq mismatch (Dave Taht) ---------- Forwarded message ---------- From: Dave Taht To: make-wifi-fast@lists.bufferbloat.net Cc: Date: Thu, 12 Jan 2017 10:44:12 -0800 Subject: [Make-wifi-fast] Fwd: [PATCH] mac80211: prevent skb/txq mismatch yea! (I think) ---------- Forwarded message ---------- From: Michal Kazior Date: Thu, Jan 12, 2017 at 6:28 AM Subject: [PATCH] mac80211: prevent skb/txq mismatch To: johannes@sipsolutions.net Cc: linux-wireless@vger.kernel.org, greearb@candelatech.com, mohammed@qti.qualcomm.com, Michal Kazior Station structure is considered as not uploaded (to driver) until drv_sta_state() finishes. This call is however done after the structure is attached to mac80211 internal lists and hashes. This means mac80211 can lookup (and use) station structure before it is uploaded to a driver. If this happens (structure exists, but sta->uploaded is false) fast_tx path can still be taken. Deep in the fastpath call the sta->uploaded is checked against to derive "pubsta" argument for ieee80211_get_txq(). If sta->uploaded is false (and sta is actually non-NULL) ieee80211_get_txq() effectively downgraded to vif->txq. At first glance this may look innocent but coerces mac80211 into a state that is almost guaranteed (codel may drop offending skb) to crash because a station-oriented skb gets queued up on vif-oriented txq. The ieee80211_tx_dequeue() ends up looking at info->control.flags and tries to use txq->sta which in the fail case is NULL. .......... _______________________________________________ Make-wifi-fast mailing list Make-wifi-fast@lists.bufferbloat.net https://lists.bufferbloat.net/listinfo/make-wifi-fast