From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?utf-8?Q?Bj=C3=B8rn_Mork?= Subject: v3.8.5: "TCP: snd_cwnd is nul, please report this bug." Date: Mon, 08 Apr 2013 11:06:48 +0200 Message-ID: <87zjx9pf13.fsf@nemi.mork.no> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org To: Eric Dumazet Return-path: Received: from canardo.mork.no ([148.122.252.1]:44737 "EHLO canardo.mork.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752895Ab3DHJGw convert rfc822-to-8bit (ORCPT ); Mon, 8 Apr 2013 05:06:52 -0400 Sender: netdev-owner@vger.kernel.org List-ID: Hello, I just got this message running a Debian experimental linux-image-3.8-trunk-amd64 kernel, currently based on v3.8.5. Peeked briefly through the commit adding the message, but I couldn't figure out what other info you'd need so please ask if there is anythin= g I can dig up. I suspect the warning could be related to problems with the iwlwifi driver and/or access point. The message was immediately followed by a few messges from iwlwifi: Apr 8 10:58:09 nemi kernel: [152701.980799] TCP: snd_cwnd is nul, plea= se report this bug. Apr 8 10:58:33 nemi kernel: [152725.176151] iwlwifi 0000:03:00.0: fail= to flush all tx fifo queues Apr 8 10:58:33 nemi kernel: [152725.185713] wlan0: authenticate with 0= 0:22:90:f9:23:a0 Apr 8 10:58:33 nemi kernel: [152725.185738] wlan0: capabilities/regula= tory prevented using AP HT/VHT configuration, downgraded Apr 8 10:58:33 nemi kernel: [152725.190150] wlan0: send auth to 00:22:= 90:f9:23:a0 (try 1/3) Apr 8 10:58:33 nemi kernel: [152725.199812] wlan0: authenticated Apr 8 10:58:33 nemi kernel: [152725.200020] iwlwifi 0000:03:00.0 wlan0= : disabling HT as WMM/QoS is not supported by the AP Apr 8 10:58:33 nemi kernel: [152725.200027] iwlwifi 0000:03:00.0 wlan0= : disabling VHT as WMM/QoS is not supported by the AP Apr 8 10:58:33 nemi kernel: [152725.204033] wlan0: associate with 00:2= 2:90:f9:23:a0 (try 1/3) Apr 8 10:58:33 nemi kernel: [152725.207317] wlan0: RX AssocResp from 0= 0:22:90:f9:23:a0 (capab=3D0x421 status=3D0 aid=3D12) Apr 8 10:58:33 nemi kernel: [152725.210745] wlan0: associated Bj=C3=B8rn