netdev - Re: v3.8.5: "TCP: snd_cwnd is nul, please report this bug."

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Date:	Mon, 08 Apr 2013 08:18:21 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Bjørn Mork <bjorn@...k.no>
Cc:	Eric Dumazet <edumazet@...gle.com>, netdev@...r.kernel.org
Subject: Re: v3.8.5: "TCP: snd_cwnd is nul, please report this bug."

On Mon, 2013-04-08 at 17:14 +0200, Bjørn Mork wrote:
> Eric Dumazet <eric.dumazet@...il.com> writes:
> > On Mon, 2013-04-08 at 11:06 +0200, Bjørn Mork wrote:
> >
> >> Apr  8 10:58:09 nemi kernel: [152701.980799] TCP: snd_cwnd is nul, please 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 00:22:90:f9:23:a0
> >> Apr  8 10:58:33 nemi kernel: [152725.185738] wlan0: capabilities/regulatory 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 00:22:90:f9:23:a0 (try 1/3)
> >> Apr  8 10:58:33 nemi kernel: [152725.207317] wlan0: RX AssocResp from 00:22:90:f9:23:a0 (capab=0x421 status=0 aid=12)
> >> Apr  8 10:58:33 nemi kernel: [152725.210745] wlan0: associated
> >> 
> >
> > Same issue was reported by Dave Jones on iwlwifi few days ago and I sent
> > following debugging patch, could you try it ?
> 
> Will do. The patch only applied on top of net-next, so I assume that's
> what you want me to test it on?
> 
> I looked through my logs and the 'fail to flush all tx fifo queues'
> warning from iwlwifi appears very infrequent.  The last time before
> today was March 18th...  Also accompanied by your warning.  That's the
> only two times I've seen that one. And I've been running v3.8-rc7 (where
> you introduced the warning) or newer since Feb 8th.
> 
> So don't hold your breath.  This may take a few weeks to trigger again.
> 

I believe patch applies (with some fuzz) on Linus tree, and maybe on 3.8
too.



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