netdev - Re: Revert "gro: Fix legacy path napi_complete crash", (was: Re: Linux 2.6.29)

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Message-ID: <20090324131208.GA10157@elte.hu>
Date:	Tue, 24 Mar 2009 14:12:08 +0100
From:	Ingo Molnar <mingo@...e.hu>
To:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Herbert Xu <herbert@...dor.apana.org.au>,
	Frank Blaschka <blaschka@...ux.vnet.ibm.com>,
	"David S. Miller" <davem@...emloft.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	netdev@...r.kernel.org
Subject: Re: Revert "gro: Fix legacy path napi_complete crash", (was: Re:
	Linux 2.6.29)


(netdev Cc:-ed)

* Ingo Molnar <mingo@...e.hu> wrote:

> Yesterday about half of my testboxes (3 out of 7) started getting 
> weird networking failures: their network interface just got stuck 
> completely - no rx and no tx at all. Restarting the interface did 
> not help.

> I've attached the reproducer (non-SMP) .config. The system has:

Note, the .config is randconfig derived. There was a stage of the 
tests when about every ~5-10th randconfig was failing, so i dont 
think it's a rare config combo that triggers this. (but there were 
other stages where 30 randconfig in a row went fine so it's hard to 
tell.)

In the worst case the hang needed 2 million packets to trigger - 
that's why i set the limit in the tests to 6 million packets.

	Ingo
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