netdev - Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF

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Date:	Wed, 30 Sep 2015 15:38:31 +0200
From:	Mathias Krause <minipli@...glemail.com>
To:	Rainer Weikusat <rweikusat@...ileactivedefense.com>
Cc:	Jason Baron <jbaron@...mai.com>, netdev@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Eric Wong <normalperson@...t.net>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Davide Libenzi <davidel@...ilserver.org>,
	Davidlohr Bueso <dave@...olabs.net>,
	Olivier Mauras <olivier@...ras.ch>,
	PaX Team <pageexec@...email.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"davem@...emloft.net" <davem@...emloft.net>
Subject: Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket

On 30 September 2015 at 15:25, Rainer Weikusat
<rweikusat@...ileactivedefense.com> wrote:
> Mathias Krause <minipli@...glemail.com> writes:
>> On 30 September 2015 at 12:56, Rainer Weikusat <rweikusat@...ileactivedefense.com> wrote:
>>> In case you want some information on this: This is a kernel warning I
>>> could trigger (more than once) on the single day I could so far spend
>>> looking into this (3.2.54 kernel):
>>>
>>> Sep 15 19:37:19 doppelsaurus kernel: WARNING: at lib/list_debug.c:53 list_del+0x9/0x30()
>>> Sep 15 19:37:19 doppelsaurus kernel: Hardware name: 500-330nam
>>> Sep 15 19:37:19 doppelsaurus kernel: list_del corruption. prev->next should be ffff88022c38f078, but was dead000000100100
>>> [snip]
>>
>> Is that with Jason's patch or a vanilla v3.2.54?
>
> That's a kernel warning which occurred repeatedly (among other "link
> pointer disorganization" warnings) when I tested the "program with
> unknown behaviour" you wrote with the kernel I'm currently supporting a
> while ago (as I already wrote in the original mail).

So I assume Jason's patch is not included in your kernel. Then those
messages are expected; expected even on kernels as old as v2.6.27.
Can you re-try with Jason's patch applied?

Thanks,
Mathias
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