linux-kernel - Re: [REGRESSION] 3.10.{6,7} crashes on network activity

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Date:	Tue, 20 Aug 2013 12:10:27 +0200
From:	Georgios Magklaras <georgios@...tek.uio.no>
To:	Arend van Spriel <arend@...adcom.com>
Cc:	Tom Gundersen <teg@...m.no>, Felix Fietkau <nbd@...nwrt.org>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org,
	Linux Wireless List <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Johannes Berg <johannes@...solutions.net>
Subject: Re: [REGRESSION] 3.10.{6,7} crashes on network activity

I verify the same issue on a Latitude E6520 running both the
vanilla/clean and the Fedora 19 specific kernels. I thought it was the
NVIDIA/nouveau driver and I reproduce by switching to non graphical mode
and performing scp transfers.

GM


On Tue, 2013-08-20 at 11:58 +0200, Arend van Spriel wrote:
> On 08/20/2013 10:36 AM, Tom Gundersen wrote:
> > On Tue, Aug 20, 2013 at 4:15 PM, Arend van Spriel <arend@...adcom.com> wrote:
> >> On 08/20/2013 06:56 AM, Felix Fietkau wrote:
> >>>
> >>> On 2013-08-20 2:28 AM, Greg Kroah-Hartman wrote:
> >>>>
> >>>> On Tue, Aug 20, 2013 at 08:26:11AM +0800, Tom Gundersen wrote:
> >>>>>
> >>>>> On Tue, Aug 20, 2013 at 8:03 AM, Greg Kroah-Hartman
> >>>>> <gregkh@...uxfoundation.org> wrote:
> >>>>>>
> >>>>>> On Tue, Aug 20, 2013 at 07:59:47AM +0800, Tom Gundersen wrote:
> >>>>>>>
> >>>>>>> Hi guys,
> >>>>>>>
> >>>>>>> Starting with 3.10.6 (and still present in .7) I get an oops on
> >>>>>>> connecting to the network.
> >>>>>>>
> >>>>>>> The attached picture shows the oops. In case it does not reach the ML,
> >>>>>>> the top of the call trace reads:
> >>>>>>>
> >>>>>>> brcms_c_compute_rtscts_dur
> >>>>>>> brcms_c_ampdu_finalize
> >>>>>>> ampdu_finalize
> >>>>>>> dma_txfast
> >>>>>>> brcms_c_txfifo
> >>>>>>> brcms_c_sendpkt_mac80211
> >>>>>>> brcms_ops_tx
> >>>>>>> __ieee80211_tx
> >>>>>>>
> >>>>>>> I bisected the problem and the first bad commit is
> >>>>>>>
> >>>>>>> commit ef47a5e4f1aaf1d0e2e6875e34b2c9595897bef6
> >>>>>>> Author: Felix Fietkau <nbd@...nwrt.org>
> >>>>>>> Date:   Fri Jun 28 21:04:35 2013 +0200
> >>>>>>>
> >>>>>>>       mac80211/minstrel_ht: fix cck rate sampling
> >>>>>>>
> >>>>>>>       commit 1cd158573951f737fbc878a35cb5eb47bf9af3d5 upstream.
> >>>>>>>
> >>>>>>> Reverting it on top of .7 fixes the problem.
> >>>>>>>
> >>>>>>> I had the same (I suppose) problem on mainline some time ago, but I
> >>>>>>> have not bisected it, verified that the problem still occurs there, or
> >>>>>>> checked if reverting the upstream patch fixes it. I'd be happy to do
> >>>>>>> that if it would help though.
> >>>>>>>
> >>>>>>> Let me know if you need any more information.
> >>>>>>
> >>>>>>
> >>>>>> Do you have this same problem with 3.11-rc6 as well?
> >>>>>
> >>>>>
> >>>>> Yes, I just confirmed. I also confirmed that reverting the mainline
> >>>>> commit on top of -rc6 fixes the problem.
> >>>>
> >>>>
> >>>> Great, thanks.
> >>>>
> >>>> Felix and Johannes, any chance we can get this reverted in Linus tree
> >>>> soon, and push that revert back to the 3.10 stable tree as well?
> >>>
> >>> I'd like to avoid a revert, since that will simply replace one set of
> >>> issues with another. Let's limit the use of the feature that brcmsmac
> >>> can't handle to drivers that are known to work with it. Tom, Please
> >>> test this patch to see if it fixes your issue.
> >>
> >>
> >> Hi Felix,
> >>
> >> I have been diving into root causing why brcmsmac can not handle cck
> >> fallback rates, because it should. Maybe it is better to flag no cck support
> >> and only change brcmsmac.
> >
> > Hi Arend,
> >
> > In case you cannot reproduce, let me know if I can help with testing patches.
> 
> So far I have not been able to reproduce it. I have a patch to avoid the 
> oops, but the transmit of the related frames will fail in the device so 
> it is not a real fix. I will let you you know.
> 
> Regards,
> Arend
> 
> > Cheers,
> >
> > Tom
> >
> 
> 
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