Re: general protection fault in tun_do_read

On Fri, Jan 26, 2018 at 4:24 AM, Jason Wang [off-list ref] wrote:

On 2018年01月25日 15:59, syzbot wrote:

quoted

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@syzkaller.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 for notifying, Jason.
Let's also tell syzbot about this so that it will ever report bugs in
tun_do_read again:

#syz dup: general protection fault in tun_queue_purge