linux-kernel - Re: Resource leak in unshare

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Message-ID: <1446508987.23275.35.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 02 Nov 2015 16:03:07 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Steffen Klassert <steffen.klassert@...unet.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 11:54 -0800, Eric Dumazet wrote:
> 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.
> 
> 

This memleak might have been added in commit
ebe084aafb7e93adf210e80043c9f69adf56820d
("sit: Use ipip6_tunnel_init as the ndo_init function.")

I'll send a patch asap, if nothing more urgent preempts me today...




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