linux-kernel - Re: Double free of struct sk_buff reported by SLAB_CONSISTENCY_CHECKS with init_on

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Message-ID: <20191105080554.GA1006@gandi.net>
Date:   Tue, 5 Nov 2019 09:05:54 +0100
From:   Thibaut Sautereau <thibaut.sautereau@...p-os.org>
To:     Eric Dumazet <eric.dumazet@...il.com>
Cc:     netdev@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        "David S. Miller" <davem@...emloft.net>,
        Laura Abbott <labbott@...hat.com>,
        Kees Cook <keescook@...omium.org>,
        Alexander Potapenko <glider@...gle.com>,
        Andrew Morton <akpm@...ux-foundation.org>, clipos@....gouv.fr
Subject: Re: Double free of struct sk_buff reported by
 SLAB_CONSISTENCY_CHECKS with init_on_free

On Mon, Nov 04, 2019 at 09:33:18AM -0800, Eric Dumazet wrote:
> 
> 
> On 11/4/19 9:03 AM, Thibaut Sautereau wrote:
> > 
> > We first encountered this issue under huge network traffic (system image
> > download), and I was able to reproduce by simply sending a big packet
> > with `ping -s 65507 <ip>`, which crashes the kernel every single time.
> > 
> 
> Since you have a repro, could you start a bisection ?

>From my previous email:

	"Bisection points to the following commit: 1b7e816fc80e ("mm: slub:
	Fix slab walking for init_on_free"), and indeed the BUG is not
	triggered when init_on_free is disabled."

Or are you meaning something else?

-- 
Thibaut Sautereau
CLIP OS developer