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

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Date:	Wed, 30 Sep 2015 14:51:51 +0100
From:	Rainer Weikusat <rweikusat@...ileactivedefense.com>
To:	Mathias Krause <minipli@...glemail.com>
Cc:	Rainer Weikusat <rweikusat@...ileactivedefense.com>,
	Jason Baron <jbaron@...mai.com>, netdev@...r.kernel.org,
	"linux-kernel\@vger.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\@infradead.org" <peterz@...radead.org>,
	"davem\@davemloft.net" <davem@...emloft.net>
Subject: Re: List corruption on epoll_ctl(EPOLL_CTL_DEL) an AF_UNIX socket

Mathias Krause <minipli@...glemail.com> writes:
> 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?

If something needs to be unregistered here (which I don't claim to
know but someone should), the corresponding code would need to be added
to the unix_dgram_disconnected function (as was already pointed
out).
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