nf_conntrack: default automatic helper assignment has been turned off for security reasons and CT-based firewall rule not found. Use the iptables CT target to attach helpers instead.
skbuff: skb_under_panic: text:ffffffff87fb5790 len:48 put:8 head:ffff88807b14a000 data:ffff88807b149ffc tail:0x2c end:0xc0 dev:sit1
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:116!
invalid opcode: 0000 [#1] PREEMPT SMP KASAN
CPU: 1 PID: 3615 Comm: syz-executor387 Not tainted 6.0.0-rc3-next-20220830-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/22/2022
RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:116
Code: f8 4c 8b 4c 24 10 8b 4b 70 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 40 83 f3 8a ff 74 24 10 ff 74 24 20 e8 7d 58 c1 ff <0f> 0b e8 ff e1 ff f7 4c 8b 64 24 18 e8 b5 96 4c f8 48 c7 c1 20 90
RSP: 0018:ffffc90003cdeaf0 EFLAGS: 00010282
RAX: 0000000000000083 RBX: ffff88807825c140 RCX: 0000000000000000
RDX: ffff88801d77ba80 RSI: ffffffff81620548 RDI: fffff5200079bd50
RBP: ffffffff8af39020 R08: 0000000000000083 R09: 0000000000000000
R10: 0000000000000400 R11: 66666666663a6b73 R12: ffffffff87fb5790
R13: 0000000000000008 R14: ffff88807d5d2000 R15: 00000000000000c0
FS:  000055555720d300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff24860a28 CR3: 000000001c7f4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 skb_under_panic net/core/skbuff.c:126 [inline]
 skb_push.cold+0x24/0x24 net/core/skbuff.c:2065
 fou_build_udp+0x30/0x370 net/ipv4/fou.c:1054
 gue_build_header+0xf7/0x140 net/ipv4/fou.c:1097
 ip_tunnel_encap include/net/ip_tunnels.h:383 [inline]
 ip_tunnel_xmit+0x679/0x3170 net/ipv4/ip_tunnel.c:735
 sit_tunnel_xmit__ net/ipv6/sit.c:1057 [inline]
 sit_tunnel_xmit+0x50f/0x2b70 net/ipv6/sit.c:1073
 __netdev_start_xmit include/linux/netdevice.h:4815 [inline]
 netdev_start_xmit include/linux/netdevice.h:4829 [inline]
 xmit_one net/core/dev.c:3590 [inline]
 dev_hard_start_xmit+0x183/0x880 net/core/dev.c:3606
 __dev_queue_xmit+0x2c31/0x3ad0 net/core/dev.c:4256
 dev_queue_xmit include/linux/netdevice.h:3004 [inline]
 neigh_connected_output+0x3c0/0x520 net/core/neighbour.c:1581
 neigh_output include/net/neighbour.h:551 [inline]
 ip_finish_output2+0x782/0x2170 net/ipv4/ip_output.c:228
 __ip_finish_output net/ipv4/ip_output.c:306 [inline]
 __ip_finish_output+0x396/0x650 net/ipv4/ip_output.c:288
 ip_finish_output+0x2d/0x280 net/ipv4/ip_output.c:316
 NF_HOOK_COND include/linux/netfilter.h:291 [inline]
 ip_mc_output+0x21b/0x700 net/ipv4/ip_output.c:415
 dst_output include/net/dst.h:451 [inline]
 ip_local_out net/ipv4/ip_output.c:126 [inline]
 ip_send_skb+0xd4/0x260 net/ipv4/ip_output.c:1589
 udp_send_skb+0x725/0x1430 net/ipv4/udp.c:969
 udp_sendmsg+0x1bb8/0x2740 net/ipv4/udp.c:1256
 udpv6_sendmsg+0x17da/0x2c70 net/ipv6/udp.c:1365
 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:653
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xcf/0x120 net/socket.c:734
 ____sys_sendmsg+0x334/0x810 net/socket.c:2482
 ___sys_sendmsg+0x110/0x1b0 net/socket.c:2536
 __sys_sendmmsg+0x18b/0x460 net/socket.c:2622
 __do_sys_sendmmsg net/socket.c:2651 [inline]
 __se_sys_sendmmsg net/socket.c:2648 [inline]
 __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2648
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7f8f47b5a489
Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 11 15 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 c0 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff24860a48 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8f47b5a489
RDX: 0000000000000001 RSI: 00000000200017c0 RDI: 0000000000000003
RBP: 0000000000000000 R08: 0000000047bc7e40 R09: 0000000047bc7e40
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000009fbc
R13: 00007fff24860a70 R14: 00007fff24860a60 R15: 00007fff24860a54
 </TASK>
Modules linked in:
---[ end trace 0000000000000000 ]---
RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:116
Code: f8 4c 8b 4c 24 10 8b 4b 70 41 56 45 89 e8 4c 89 e2 41 57 48 89 ee 48 c7 c7 40 83 f3 8a ff 74 24 10 ff 74 24 20 e8 7d 58 c1 ff <0f> 0b e8 ff e1 ff f7 4c 8b 64 24 18 e8 b5 96 4c f8 48 c7 c1 20 90
RSP: 0018:ffffc90003cdeaf0 EFLAGS: 00010282
RAX: 0000000000000083 RBX: ffff88807825c140 RCX: 0000000000000000
RDX: ffff88801d77ba80 RSI: ffffffff81620548 RDI: fffff5200079bd50
RBP: ffffffff8af39020 R08: 0000000000000083 R09: 0000000000000000
R10: 0000000000000400 R11: 66666666663a6b73 R12: ffffffff87fb5790
R13: 0000000000000008 R14: ffff88807d5d2000 R15: 00000000000000c0
FS:  000055555720d300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fff24860a28 CR3: 000000001c7f4000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400