linux-kernel - Re: [patch] revert: [NET]: Fix races in net_rx

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Message-ID: <20070719150728.GA17000@elte.hu>
Date:	Thu, 19 Jul 2007 17:07:28 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Olaf Kirch <olaf.kirch@...cle.com>
Cc:	Jarek Poplawski <jarkao2@...pl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	Auke Kok <auke-jan.h.kok@...el.com>
Subject: Re: [patch] revert: [NET]: Fix races in net_rx_action vs netpoll

ugh. Something really weird happened with this e1000 problem.

i crashed the laptop in a weird way and had to power-cycle it in an 
unusual fashion. After that i wanted to try your latest BUG_ON() theory 
but the network hang went away!

For 3 hours i tried to reproduce the hang (i went back to the original 
git tree and the .config under which i found it, i power cycled it 
again, i unplugged the power cord to make it go off battery, unplugged 
the ethernet, recreated a completely new tree, etc. etc.) but with no 
success! Total Heisenbug - and the really annoying thing is that you 
just had a good theory about what might be happening. I'm now at kernel 
build iteration #75 in this tree ...

maybe it's not the power-cycling that somehow brought the e1000 out of 
its weird state but the ethtool ops (and the related firmware readouts, 
etc.)?

(i have your BUG_ON() applied (as a WARN_ON()), but it doesnt trigger. 
Not that this means anything under these circumstances ...)

	Ingo
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