netdev - Re: [RFC PATCH 02/12] On Tue, 23 Sep 2008, David Miller wrote:

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Message-ID: <4807377b0810031630t54e4bb46y87fe7e34f3be60ac@mail.gmail.com>
Date:	Fri, 3 Oct 2008 16:30:04 -0700
From:	"Jesse Brandeburg" <jesse.brandeburg@...il.com>
To:	"Jiri Kosina" <jkosina@...e.cz>
Cc:	"Jesse Barnes" <jbarnes@...tuousgeek.org>,
	"David Miller" <davem@...emloft.net>, jesse.brandeburg@...el.com,
	linux-kernel@...r.kernel.org, netdev@...r.kernel.org,
	kkeil@...e.de, agospoda@...hat.com, arjan@...ux.intel.com,
	david.graham@...el.com, bruce.w.allan@...el.com,
	john.ronciak@...el.com, "Thomas Gleixner" <tglx@...utronix.de>,
	chris.jones@...onical.com, tim.gardner@...onical.com,
	airlied@...il.com, "Olaf Kirch" <okir@...e.de>,
	"Linus Torvalds" <torvalds@...ux-foundation.org>
Subject: Re: [RFC PATCH 02/12] On Tue, 23 Sep 2008, David Miller wrote:

On Fri, Oct 3, 2008 at 4:28 PM, Jesse Brandeburg
<jesse.brandeburg@...il.com> wrote:
> On Fri, Oct 3, 2008 at 2:45 PM, Jiri Kosina <jkosina@...e.cz> wrote:
>> Karsten has been testing kernel with these three patches from the series
>> applied:
>>
>>        e1000e: reset swflag after resetting hardware
>>        e1000e: fix lockdep issues
>>        e1000e: debug contention on NVM SWFLAG
>>
>> This was done on a hardware which previously triggered the bug in just a
>> few test iterations in quite a reliable way. Now, with these patches
>> applied, the EEPROM corruption didn't happen after several tens of
>> iterations.
>>
>> Please note, that the patch that disables the writes to EEPROM on hardware
>> level was *not* involved in this testing.
>>
>> Therefore it currently seems that these three patches really address the
>> race condition issue that was present in the e1000e driver.
>
> Our experience is different.  We are also testing with the "protection
> patch" reverted.
>
> We see that the problem specifically comes and goes when
> removing/adding the use of set_memory_ro/set_memory_rw to the driver.
>
> I'm working to catch the bad element in the act with a hardware
> breakpoint or an ITP (we're trying both)
>
>> It is still not clear why the bug started triggering all of a sudden for
>> so many people though.
>
> we plan to keep on working on this until we understand what is going on.

I removed the bad addresses from the cc: list
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