netdev - RE: [REGRESSION] e1000e stopped working [MANUALLY BISECTED]

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Date:	Sat, 17 Jul 2010 16:54:57 +0300
From:	Maxim Levitsky <maximlevitsky@...il.com>
To:	"Tantilov, Emil S" <emil.s.tantilov@...el.com>
Cc:	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Allan, Bruce W" <bruce.w.allan@...el.com>,
	"Pieper, Jeffrey E" <jeffrey.e.pieper@...el.com>
Subject: RE: [REGRESSION] e1000e stopped working [MANUALLY BISECTED]

On Fri, 2010-07-16 at 17:23 -0600, Tantilov, Emil S wrote:
> Maxim Levitsky wrote:
> > On Thu, 2010-07-15 at 22:09 +0300, Maxim Levitsky wrote:
> >> On Thu, 2010-07-15 at 13:02 -0600, Tantilov, Emil S wrote:
> >>> Maxim Levitsky wrote:
> >>>> On Thu, 2010-07-15 at 02:33 +0300, Maxim Levitsky wrote:
> >>>>> On Wed, 2010-07-14 at 16:56 -0600, Tantilov, Emil S wrote:
> >>>>>> Maxim Levitsky wrote:
> >>>>>>> On Mon, 2010-07-12 at 15:23 -0600, Tantilov, Emil S wrote:
> >>>>>>>> Maxim Levitsky wrote:
> >>>>>>>>> On Mon, 2010-07-05 at 12:58 +0300, Maxim Levitsky wrote:
> >>>>>>>>>> On Mon, 2010-07-05 at 01:13 -0700, Jeff Kirsher wrote:
> >>>>>>>>>>> On Sun, Jul 4, 2010 at 15:48, Maxim Levitsky
> >>>>>>>>>>> <maximlevitsky@...il.com> wrote:
> >>>>>>>>>>>> Did few guesses, and now I see that reverting the below
> >>>>>>>>>>>> commit fixes the problem. 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> "e1000e: Fix/cleanup PHY reset code for ICHx/PCHx"
> >>>>>>>>>>>> e98cac447cc1cc418dff1d610a5c79c4f2bdec7f.
> >>>>>>>>>>>> 
> >>>>>>>>>>>> 
> >>>>>>>>>>>> Best regards,
> >>>>>>>>>>>>        Maxim Levitsky
> >>>>>>>>>>>> 
> >>>>>>>>>>>> --
> >>>>>>>>>>> 
> >>>>>>>>>>> Can you give us till Tuesday to respond?  I know that there
> >>>>>>>>>>> are some additional e1000e patches in my queue, which may
> >>>>>>>>>>> resolve the issue, but this weekend the power is down to do
> >>>>>>>>>>> some infrastructure upgrades which prevents us from doing
> >>>>>>>>>>> any investigation.debugging until Tuesday.
> >>>>>>>>>>> 
> >>>>>>>>>> 
> >>>>>>>>>> Sure.
> >>>>>>>>>> 
> >>>>>>>>>> Best regards,
> >>>>>>>>>> 	Maxim Levitsky
> >>>>>>>>>> 
> >>>>>>>>> 
> >>>>>>>>> Updates?
> >>>>>>>> 
> >>>>>>>> We are working on reproducing the issue. So far we have not
> >>>>>>>> seen the problem when testing with net-next.
> >>>>>>>> 
> >>>>>>>> I asked in previous email about some additional info from
> >>>>>>>> ethtool (-d, -e, -S) and kernel config. That would help us to
> >>>>>>>> narrow it down. 
> >>>>>>>> 
> >>>>>>>> Thanks,
> >>>>>>>> Emil
> >>>>>>> I did send -e and -d output.
> >>>>>> 
> >>>>>> Sorry, looks like I lost the email with the attachements.
> >>>>>> 
> >>>>>> Could you provide the output of dmesg after the failure occurs?
> >>>>>> 
> >>>>>>> Since you probably want -S output during failure, I need to
> >>>>>>> recompile kernel for that. I will do that soon.
> >>>>>>> 
> >>>>>>> 
> >>>>>>> One question, in two weeks I hope 2.6.35 won't be released?
> >>>>>>> If so, I will have enough free time then to narrow down this
> >>>>>>> issue. 
> >>>>>>> 
> >>>>>>> Other solution, is to revert this commit.
> >>>>>>> (I have never seen this problem with it reverted).
> >>>>>> 
> >>>>>> We have been running reboot tests on 2 separate systems with
> >>>>>> recent net-next kernels using your config and so far no luck in
> >>>>>> reproducing this issue. 
> >>>>>> 
> >>>>>> What is the make model of your system (or MB)?
> >>>>> 
> >>>>> the motherboard is Intel DG965RY.
> >>>>> 
> >>>>> However, I am using vanilla kernel.
> >>>>> net-next might contain further fixes.
> >>>>> 
> >>>>> I see if net-next works here.
> >>>> 
> >>>> Yep, net-next works here.
> >>>> 
> >>>> 
> >>>> I have the problem on vanilla kernel.
> >>>> Last revision of it, I tested is 2.6.35-rc4 exactly
> >>>> (815c4163b6c8ebf8152f42b0a5fd015cfdcedc78)
> >>>> 
> >>>> 
> >>>> Maybe vanilla git master works, I test it too soon.
> >>> 
> >>> Thanks for the information! Good to know that this issue does not
> >>> exist in the latest branch. 
> >>> 
> >>> Have you by any chance tested a stable branch (2.6.34.x)?
> >> 
> >> I only did test plain 2.6.34 (v2.6.34)
> > And forgot to add, that it did work.
> > 
> >> 
> >> Also I repeat that revert of e98cac447cc1cc418dff1d610a5c79c4f2bdec7f
> >> (e1000e: Fix/cleanup PHY reset code for ICHx/PCHx) fixes the bug on
> >> vanilla kernel. 
> >> 
> >> Also I just pulled latest vanilla git, and I according to diffstat I
> >> see no changes in e1000e, so its likely that bug remains there.
> >> I will test that soon.
> > Tested, broken as expected.
> 
> That makes sense. Unfortunately we are still not able to reproduce even on recent pull from Linus tree.
> 
> If you want - you can look at the patches for e1000e in net-next and start applying those to your tree until the issue is resolved.
> 
That exactly what I will do soon.


Also I can narrow down the problem by reverting the commit partially.

After one week, I will have enough free time to do all the thing like
above. Now I have none.


> I will keep trying it here, but none of the systems we have exhibit the issue you described, so the bug could be exposed by something in your system/config.
I also think so. Otherwise, we would see more bug-reports.

You probably don't need to try anymore and reproduce that issue, because
of that.


Best regards,
	Maxim Levitsky

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