duplicate authentications / excessive missing ACKs / deauth due to inactivity timer

Ben Greear greearb at candelatech.com
Wed Jul 22 10:27:16 EDT 2020

On 7/22/20 7:18 AM, Leon M. George wrote:
> Hi :-)
> I've encountered connection issues that appear to be strongly related to the
> problem in this thread [1] (found via the arch linux bug tracker [2]).

If this is ath10k-ct only problem, plz don't bother this list and send to just me
and/or add to ath10k-ct bugtracker on github.

If it does affect upstream ath10k too, then that would be valid for this mailing


> Symptoms:
> ap: "disconnected due to excessive missing ACKs"
> station: "No beacon heard and the time event is over already..."
> Using a monitoring interface on the AP i was able to confirm that the beacon is
> indeed not being sent at any time.
> I've found a configuration that reliably produces this state
> ("error state" from here on):
> If any number of mesh (or adhoc with ct) points are configured alongside any
> number of ordinary APs, this issue starts appearing.
> The mesh connections appear to be working correctly in the error state.
> I tested various combinations of openwrt-19.xx and openwrt-trunk
> with ath10k/ath10k-ct - all were affected.
> Aligning with my vague memory, a user on the openwrt forum reports the issue isn't
> present in openwrt-18.xx [3].
> About the ruling out client issues:
> My employer is operating installations with multiple hundreds of ath10k access
> points.
> We couldn't identify the source of the issue at first when we encountered it in
> our live setup and received unsolicited reports from basically every
> installation.
> As far as we can tell, no client is able to connect in the error state.
> We've had our users confirm the bug for
>    - Apple phones/tablets/macbooks
>    - Samsung phones, laptops
>    - computers with Intel/Realtek/AzureWave-hardware.
> I hope this info is helpful.
> kind regards,
> Leon George
> [1] https://www.mail-archive.com/ath10k@lists.infradead.org/msg11599.html
> [2] https://bugs.archlinux.org/task/58457
> [3] https://forum.openwrt.org/t/wifi-connectivity-issues-with-ath10k/67779
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Ben Greear <greearb at candelatech.com>
Candela Technologies Inc  http://www.candelatech.com

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