linux-kernel - Re: [GIT] Networking

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Message-ID: <1463581411.29999.1.camel@intel.com>
Date:	Wed, 18 May 2016 14:23:31 +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 06:51 -0600, Reinoud Koornstra wrote:
> 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@...em
> > > > > > loft
> > > > > > .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.

I can confirm that 4.6 contains the same bug.  And reverting the patch
I mentioned does solve the problem...

The same patch works fine in our internal tree.  I'll have to figure
out together with Emmanuel what the problem actually is.

--
Luca.