linux-kernel - Re: kernel BUG at net/core/skbuff.c:LINE! (2)

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Message-ID: <1512882741.25033.39.camel@gmail.com>
Date:   Sat, 09 Dec 2017 21:12:21 -0800
From:   Eric Dumazet <eric.dumazet@...il.com>
To:     Xin Long <lucien.xin@...il.com>,
        Cong Wang <xiyou.wangcong@...il.com>
Cc:     syzbot 
        <bot+ed0838d0fa4c4f2b528e20286e6dc63effc7c14d@...kaller.appspotmail.com>,
        davem <davem@...emloft.net>, kuznet <kuznet@....inr.ac.ru>,
        LKML <linux-kernel@...r.kernel.org>, linux-sctp@...r.kernel.org,
        network dev <netdev@...r.kernel.org>,
        Neil Horman <nhorman@...driver.com>,
        syzkaller-bugs@...glegroups.com,
        Vlad Yasevich <vyasevich@...il.com>,
        yoshfuji <yoshfuji@...ux-ipv6.org>
Subject: Re: kernel BUG at net/core/skbuff.c:LINE! (2)

On Sun, 2017-12-10 at 12:38 +0800, Xin Long wrote:
> On Sun, Dec 10, 2017 at 3:36 AM, Cong Wang <xiyou.wangcong@...il.com>
> wrote:
> > On Fri, Dec 8, 2017 at 12:45 AM, Xin Long <lucien.xin@...il.com>
> > wrote:
> > > This isn't a sctp problem, but mld's, seems when lo's mtu became
> > > 0,
> > > it allocs a skb without enough space in add_grec():
> > 
> > Shouldn't we just set its min_mtu to ETH_MIN_MTU?
> 
> No idea why there's no min_mtu limitation for lo dev.

Because it wont solve this bug.

ETH_MIN_MTU is really about IPv4.