linux-kernel - Re: general protection fault in tun_do

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Message-ID: <22368c17-31fe-0f71-8182-0a63707897cf@redhat.com>
Date:   Fri, 26 Jan 2018 11:24:03 +0800
From:   Jason Wang <jasowang@...hat.com>
To:     syzbot <syzbot+885a488f0e7e392e9022@...kaller.appspotmail.com>,
        Linyu.Yuan@...atel-sbell.com.cn, davem@...emloft.net,
        edumazet@...gle.com, linux-kernel@...r.kernel.org,
        netdev@...r.kernel.org, peterpenkov96@...il.com,
        syzkaller-bugs@...glegroups.com, willemb@...gle.com,
        xiyou.wangcong@...il.com
Subject: Re: general protection fault in tun_do_read



On 2018年01月25日 15:59, syzbot wrote:
> Hello,
>
> syzbot hit the following crash on net-next commit
> 43df215d99e6049d4680309c54232689e16ddd6b (Wed Jan 24 01:24:32 2018 +0000)
> Merge branch 'bpf-and-netdevsim-test-updates'
>
> So far this crash happened 2 times on net-next.
> Unfortunately, I don't have any reproducer for this crash yet.
> Raw console output is attached.
> compiler: gcc (GCC) 7.1.1 20170620
> .config is attached.
>
> IMPORTANT: if you fix the bug, please add the following tag to the 
> commit:
> Reported-by: syzbot+885a488f0e7e392e9022@...kaller.appspotmail.com
> It will help syzbot understand when the bug is fixed. See footer for 
> details.
> If you forward the report, please keep this part and the footer.

I suspect this is the same as what syzbot repots here 
https://www.spinics.net/lists/netdev/msg480736.html.

We're discussing a solution posted by Michael here 
https://patchwork.ozlabs.org/patch/866064/

Thanks