linux-kernel - Re: [GIT] Networking

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Message-ID: <1463575273.13625.23.camel@intel.com>
Date:	Wed, 18 May 2016 12:41:14 +0000
From:	"Coelho, Luciano" <luciano.coelho@...el.com>
To:	"reinoudkoornstra@...il.com" <reinoudkoornstra@...il.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, 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?

--
Cheers,
Luca.