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:ffffffff87f4eab0 len:48 put:8 head:ffff88814ae53c00 data:ffff88814ae53bfc tail:0x2c end:0xc0 dev:sit1 ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:113! invalid opcode: 0000 [#1] PREEMPT SMP KASAN CPU: 1 PID: 3614 Comm: syz-executor387 Not tainted 5.18.0-syzkaller-12117-gcf67838c4422 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011 RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:113 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 20 91 d2 8a ff 74 24 10 ff 74 24 20 e8 ff ce c0 ff <0f> 0b e8 7a 59 09 f8 4c 8b 64 24 18 e8 40 10 56 f8 48 c7 c1 40 9e RSP: 0018:ffffc90002f1eb28 EFLAGS: 00010282 RAX: 0000000000000083 RBX: ffff8880709c4640 RCX: 0000000000000000 RDX: ffff88801b01d880 RSI: ffffffff8160ed68 RDI: fffff520005e3d57 RBP: ffffffff8ad29e40 R08: 0000000000000083 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000000 R12: ffffffff87f4eab0 R13: 0000000000000008 R14: ffff8880740e8000 R15: 00000000000000c0 FS: 00005555574e8300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200017c0 CR3: 000000001f6a7000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> skb_under_panic net/core/skbuff.c:123 [inline] skb_push.cold+0x24/0x24 net/core/skbuff.c:2034 fou_build_udp+0x30/0x370 net/ipv4/fou.c:1056 gue_build_header+0xf7/0x140 net/ipv4/fou.c:1099 ip_tunnel_encap include/net/ip_tunnels.h:380 [inline] ip_tunnel_xmit+0x60f/0x2c00 net/ipv4/ip_tunnel.c:733 sit_tunnel_xmit__ net/ipv6/sit.c:1065 [inline] sit_tunnel_xmit+0x50f/0x2b80 net/ipv6/sit.c:1081 __netdev_start_xmit include/linux/netdevice.h:4805 [inline] netdev_start_xmit include/linux/netdevice.h:4819 [inline] xmit_one net/core/dev.c:3588 [inline] dev_hard_start_xmit+0x188/0x880 net/core/dev.c:3604 __dev_queue_xmit+0x2b1d/0x3900 net/core/dev.c:4253 dev_queue_xmit include/linux/netdevice.h:2994 [inline] neigh_connected_output+0x3c0/0x520 net/core/neighbour.c:1557 neigh_output include/net/neighbour.h:549 [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+0x32/0x280 net/ipv4/ip_output.c:316 NF_HOOK_COND include/linux/netfilter.h:296 [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:1571 udp_send_skb+0x725/0x1430 net/ipv4/udp.c:967 udp_sendmsg+0x1bee/0x2760 net/ipv4/udp.c:1254 udpv6_sendmsg+0x176b/0x2c50 net/ipv6/udp.c:1365 inet6_sendmsg+0x99/0xe0 net/ipv6/af_inet6.c:652 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 ____sys_sendmsg+0x334/0x810 net/socket.c:2492 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546 __sys_sendmmsg+0x195/0x470 net/socket.c:2632 __do_sys_sendmmsg net/socket.c:2661 [inline] __se_sys_sendmmsg net/socket.c:2658 [inline] __x64_sys_sendmmsg+0x99/0x100 net/socket.c:2658 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+0x46/0xb0 RIP: 0033:0x7fe8ff172479 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:00007fff3e434fe8 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007fe8ff172479 RDX: 0000000000000001 RSI: 00000000200017c0 RDI: 0000000000000003 RBP: 0000000000000000 R08: 00000000ff1dfe40 R09: 00000000ff1dfe40 R10: 0000000000000000 R11: 0000000000000246 R12: 000000000000c1f8 R13: 00007fff3e435010 R14: 00007fff3e435000 R15: 00007fff3e434ff4 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_panic+0x16c/0x16e net/core/skbuff.c:113 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 20 91 d2 8a ff 74 24 10 ff 74 24 20 e8 ff ce c0 ff <0f> 0b e8 7a 59 09 f8 4c 8b 64 24 18 e8 40 10 56 f8 48 c7 c1 40 9e RSP: 0018:ffffc90002f1eb28 EFLAGS: 00010282 RAX: 0000000000000083 RBX: ffff8880709c4640 RCX: 0000000000000000 RDX: ffff88801b01d880 RSI: ffffffff8160ed68 RDI: fffff520005e3d57 RBP: ffffffff8ad29e40 R08: 0000000000000083 R09: 0000000000000000 R10: 0000000000000400 R11: 0000000000000000 R12: ffffffff87f4eab0 R13: 0000000000000008 R14: ffff8880740e8000 R15: 00000000000000c0 FS: 00005555574e8300(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00000000200017c0 CR3: 000000001f6a7000 CR4: 00000000003506e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400