Re: general protection fault in tun_do_read

[Jason Wang]

On 2018å01æ25æ 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@xxxxxxxxxxxxxxxxxxxxxxxxx
> 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