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Subject: Re: [PATCH v2] 802.11n IBSS: wlan0 stops receiving packets due to
 aggregation after sender reboot
From:   Johannes Berg <johannes@sipsolutions.net>
To:     Koen Vandeputte <koen.vandeputte@ncentric.com>,
        Krzysztof =?UTF-8?Q?Ha=C5=82asa?= <khalasa@piap.pl>
Cc:     "David S. Miller" <davem@davemloft.net>,
        linux-wireless@vger.kernel.org, netdev@vger.kernel.org,
        linux-kernel@vger.kernel.org
Date:   Tue, 29 Oct 2019 10:03:02 +0100
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On Tue, 2019-10-29 at 09:41 +0100, Koen Vandeputte wrote:

> I can confirm the issue as I'm also seeing this sometimes in the field here.
> 
> Sometimes when a devices goes out of range and then re-enters,
> the link refuses to "come up", as in rx looks to be "stuck" without any 
> reports in system log or locking issues (lockdep enabled)

Right. I've recently debugged this due to issues in distributed
beaconing (rather than moving in/out of range), but I guess it would be
relatively simple to reproduce this with wmediumd, if that can be
controlled dynamically?

What kernel are you running? You could check if you have

95697f9907bf ("mac80211: accept deauth frames in IBSS mode")
4b08d1b6a994 ("mac80211: IBSS: send deauth when expiring inactive STAs")

which might help somewhat, but don't fully cover the case of moving out
of range.

johannes