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

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Date:	Tue, 20 Aug 2013 16:36:03 +0800
From:	Tom Gundersen <teg@...m.no>
To:	Arend van Spriel <arend@...adcom.com>
Cc:	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

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.

Cheers,

Tom
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