linux-kernel - Re: eventpoll __list_del

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Message-ID: <20140603151147.GX30445@twins.programming.kicks-ass.net>
Date:	Tue, 3 Jun 2014 17:11:47 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Jason Baron <jbaron@...mai.com>
Cc:	Sasha Levin <sasha.levin@...cle.com>,
	Ingo Molnar <mingo@...nel.org>,
	"acme@...stprotocols.net" <acme@...stprotocols.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Dave Jones <davej@...hat.com>,
	"edumazet@...gle.com" <edumazet@...gle.com>,
	"viro@...iv.linux.org.uk" <viro@...iv.linux.org.uk>
Subject: Re: eventpoll __list_del_entry corruption

On Tue, Jun 03, 2014 at 11:07:11AM -0400, Jason Baron wrote:
> Hi Peter,
> 
> If its possible to reproduce maybe we can apply the following debug

I think I saw it twice during a week of fuzzing, so it might be a while,
esp. since I'm now not actively fuzzing anymore, but I can sure stuff
this in my tmp/trinity branch just in case.

Sasha and Dave might also want to carry it for a while, since they're
doing far more of this than me.

> patch to at least have a clue about which wait queue has gotten
> corrupted. The bug could also be isolated to the epoll core too (ie
> not specific to a particular wait queue), but I think its worth a
> shot...
> 
> Thanks,
> 
> -Jason

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