netdev - Re: [GIT] Networking

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Date:	Wed, 18 May 2016 06:51:55 -0600
From:	Reinoud Koornstra <reinoudkoornstra@...il.com>
To:	"Coelho, Luciano" <luciano.coelho@...el.com>
Cc:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linuxwifi <linuxwifi@...el.com>,
	"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
	"Berg, Johannes" <johannes.berg@...el.com>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"kvalo@...eaurora.org" <kvalo@...eaurora.org>,
	"egrumbach@...il.com" <egrumbach@...il.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>,
	"Grumbach, Emmanuel" <emmanuel.grumbach@...el.com>
Subject: Re: [GIT] Networking

On Wed, May 18, 2016 at 6:41 AM, Coelho, Luciano
<luciano.coelho@...el.com> wrote:
> On Wed, 2016-05-18 at 06:20 -0600, Reinoud Koornstra wrote:
>> On Wed, May 18, 2016 at 4:51 AM, Coelho, Luciano
>> <luciano.coelho@...el.com> wrote:
>> >
>> > Hi Emmanuel, Linus,
>> >
>> >
>> > On Wed, 2016-05-18 at 06:37 +0300, Emmanuel Grumbach wrote:
>> > >
>> > > On Wed, May 18, 2016 at 4:00 AM, Linus Torvalds
>> > > <torvalds@...ux-foundation.org> wrote:
>> > > >
>> > > >
>> > > > On Tue, May 17, 2016 at 12:11 PM, David Miller <davem@...emloft
>> > > > .net
>> > > > >
>> > > > > wrote:
>> > > > >
>> > > > >
>> > > > > Highlights:
>> > > > Lowlights:
>> > > >
>> > > >  1) the iwlwifi driver seems to be broken
>> > > >
>> > > > My laptop that uses the intel 7680 iwlwifi module no longer
>> > > > connects
>> > > > to the network. It fails with a "Microcode SW error detected."
>> > > > and
>> > > > spews out register state over and over again.
>> > > Can we have the register state and the ASSERT / NMI / whatever
>> > > that
>> > > goes along with it?
>> > > This clearly means that the firmware is crashing, but I don't
>> > > know
>> > > why,
>> > > I copied here the lines that I need from another bug with another
>> > > device with another firmware,
>> > > but the log that we will still explain what I need:
>> > I managed to reproduce this bug locally with Linus' master.  I'm
>> > investigating the cause and I'll let you how it goes.
>> I did run the latest git code as well 4.6+
>> iwlwifi went pearshape in my case as well.
>> I just updated the microcode as well, it didn't matter.
>> 4.6-rc7 works fine and no errors are reported with iwlwifi.
>>
>> Here's output that might come in handy
>
> Thanks! That is helpful.
>
> Since you say that 4.6-rc7 works but 4.6 doesn't, the prime suspect is
> commit 5c08b0f5026f ("iwlwifi: mvm: don't override the rate with the
> AMSDU len"), which is the only iwlwifi patch between those two
> releases.
>
> Could you try to revert that and see if the error is gone?

Will do, since git revert failed I'll revert manually and report back.

>
> --
> Cheers,
> Luca.