Re: Resource leak in unshare

From: Eric Dumazet
Date: Mon Nov 02 2015 - 14:54:22 EST

On Mon, 2015-11-02 at 13:01 -0600, Eric W. Biederman wrote:
> Dmitry Vyukov <dvyukov@xxxxxxxxxx> 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 :
ip netns add foo
ip netns del foo

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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