netdev - Re: [1/3] 2.6.21-rc6: known regressions

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Message-ID: <5640c7e00704132207t3ba31229k8e9e11f34613df16@mail.gmail.com>
Date:	Sat, 14 Apr 2007 17:07:55 +1200
From:	"Ian McDonald" <ian.mcdonald@...di.co.nz>
To:	"Linus Torvalds" <torvalds@...ux-foundation.org>
Cc:	"Adrian Bunk" <bunk@...sta.de>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Jeff Garzik" <jgarzik@...ox.com>, netdev@...r.kernel.org,
	e1000-devel@...ts.sourceforge.net, "Ingo Molnar" <mingo@...e.hu>,
	"Ayaz Abdulla" <aabdulla@...dia.com>,
	"Dave Jones" <davej@...hat.com>,
	"David S. Miller" <davem@...emloft.net>, "Greg KH" <greg@...ah.com>
Subject: Re: [1/3] 2.6.21-rc6: known regressions

On 4/14/07, Linus Torvalds <torvalds@...ux-foundation.org> wrote:
>
> Note: Ingo also reports what looks like a memory corruption due to
> the 6b6b6b6b pattern on presumably the same box.
>
> The 6b6b6b6b pattern is POISON_FREE, implying some kind of slab misuse,
> most likely a use-after-free, although possibly just due to overrunning a
> slab into the next one or something like that.
>
> What I'm leading up to is that I'm wondering if these mysterious network
> driver bugs aren't due to the network drivers themselves, but due to some
> higher-level problem. I think the hangs that Ingo sees with forcedeth were
> preceded by mysterious and "impossible" NULL pointer oopses. Ingo?
>
> Davem - have there been network infrastructure changes that migt be
> suspect? Jeff and/or Greg - anything in the generic network driver/device
> driver level? We had some trouble earlier with the transition to the
> driver core, and kref miscounting. Related? The last Oops Ingo saw was a
> module refcounting one, iirc.
>
> It does seem networking related somehow. Yeah, it could be obviously be a
> combination of independent bugs both in e1000/ and forcedeth drivers, but
> maybe there is something in common here...
>
I don't know if this is a red herring or not but I reported on March
13th slab corruption and it looked like file_free_rcu - these are
fairly recent changes I think (rcu)?

Anyway original message is at http://lkml.org/lkml/2007/3/12/364

My apologies if this is not related.

Ian
-- 
Web: http://wand.net.nz/~iam4/
Blog: http://iansblog.jandi.co.nz
WAND Network Research Group
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