netdev - Re: Resource leak in unshare

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Message-ID: <1446494052.23275.25.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 02 Nov 2015 11:54:12 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>
Cc:	Dmitry Vyukov <dvyukov@...gle.com>,
	David Miller <davem@...emloft.net>, nicolas.dichtel@...nd.com,
	Al Viro <viro@...iv.linux.org.uk>, Thomas Graf <tgraf@...g.ch>,
	xiyou.wangcong@...il.com, netdev@...r.kernel.org,
	LKML <linux-kernel@...r.kernel.org>,
	Alexey Kuznetsov <kuznet@....inr.ac.ru>, jmorris@...ei.org,
	yoshfuji@...ux-ipv6.org, Patrick McHardy <kaber@...sh.net>,
	syzkaller <syzkaller@...glegroups.com>,
	Kostya Serebryany <kcc@...gle.com>,
	Alexander Potapenko <glider@...gle.com>,
	Eric Dumazet <edumazet@...gle.com>,
	Kees Cook <keescook@...gle.com>,
	Julien Tinnes <jln@...gle.com>,
	Sasha Levin <sasha.levin@...cle.com>
Subject: Re: Resource leak in unshare

On Mon, 2015-11-02 at 13:01 -0600, Eric W. Biederman wrote:
> Dmitry Vyukov <dvyukov@...gle.com> writes:
> 
> > Hello,
> >
> > I am hitting the following warnings on
> > bcee19f424a0d8c26ecf2607b73c690802658b29 (4.3):
> 
> Do you have any trace of the earlier failures?
> 
> This appears to be something caused by an earlier failure (possibly
> whatever fails to allocate memory).  Having network devices present
> but being in the generic cleanup routines is wrong.
> 
> If there is no additional information can you please rerun with the
> following change applied?  That should at least report which function is
> failing, and give us a good clue where to start debugging this.

At first, I would say sit is leaking percpu memory

Load sit module, then :

while :
do
ip netns add foo
ip netns del foo
done

Will eat all memory eventually.

ipip6_tunnel_init() and ipip6_fb_tunnel_init() are _both_ called for the
sit0 device, this looks very wrong.



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