net-next build error (2)

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: 7b3ed2a1 Merge branch '100GbE' of git://git.kernel.org/pub..
git tree: net-next
console output: https://syzkaller.appspot.com/x/log.txt?x=17bf8fd8a00000
kernel config: https://syzkaller.appspot.com/x/.config?x=182ab6ef38134502
dashboard link: https://syzkaller.appspot.com/bug?extid=21456e3ef58cde16e0fa
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+21456e...@syzkaller.appspotmail.com

./include/linux/netfilter_ipv6.h:110:9: error: implicit declaration of
function ‘nf_ct_frag6_gather’ [-Werror=implicit-function-declaration]

---
This bug is generated by a bot. It may contain errors.
See https://goo.gl/tpsmEJ for more information about syzbot.
syzbot engineers can be reached at syzk...@googlegroups.com.

syzbot will keep track of this bug report. See:
https://goo.gl/tpsmEJ#status for how to communicate with syzbot.

[Eric Biggers]

> --
> You received this message because you are subscribed to the Google Groups "syzkaller-bugs" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to syzkaller-bug...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/syzkaller-bugs/000000000000f53c90058a303d80%40google.com.
> For more options, visit https://groups.google.com/d/optout.

#syz fix: netfilter: nf_conntrack_bridge: fix CONFIG_IPV6=y