------------[ cut here ]------------
WARNING: CPU: 0 PID: 4109 at include/linux/skbuff.h:2784 skb_dst include/linux/skbuff.h:1098 [inline]
WARNING: CPU: 0 PID: 4109 at include/linux/skbuff.h:2784 skb_dst_update_pmtu_no_confirm include/net/dst.h:550 [inline]
WARNING: CPU: 0 PID: 4109 at include/linux/skbuff.h:2784 skb_tunnel_check_pmtu+0x4a9/0x3420 net/ipv4/ip_tunnel_core.c:416
Modules linked in:
CPU: 0 PID: 4109 Comm: syz-executor.0 Not tainted 5.19.0-rc2-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:skb_mac_header_len include/linux/skbuff.h:2784 [inline]
RIP: 0010:skb_tunnel_check_pmtu+0x4a9/0x3420 net/ipv4/ip_tunnel_core.c:413
Code: ff ff ff 0f 0b 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 84 f9 fe ff ff e8 2c 3a 70 fa e9 ef fe ff ff <0f> 0b e9 21 fd ff ff 48 b8 00 00 00 00 00 fc ff df 4c 89 ea 48 c1
RSP: 0018:ffffc90002e4f540 EFLAGS: 00010246
RAX: 000000000000ffff RBX: 1ffff920005c9eb8 RCX: 0000000000000000
RDX: 000000000000000e RSI: ffff888020aba500 RDI: ffff888012b691fa
RBP: ffffc90002e4f668 R08: 0000000000000001 R09: ffff888020aba543
R10: ffffed10041574a8 R11: ffff888012b691b0 R12: 000000000000ffcd
R13: ffff888012b69208 R14: ffff888012b69200 R15: ffff888012b69140
FS:  00007f79a7e08700(0000) GS:ffff8880b9c00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000080 CR3: 0000000020af7000 CR4: 00000000003506f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 geneve_xmit_skb drivers/net/geneve.c:927 [inline]
 geneve_xmit+0xb5b/0x2f20 drivers/net/geneve.c:1107
 __netdev_start_xmit include/linux/netdevice.h:4805 [inline]
 netdev_start_xmit include/linux/netdevice.h:4819 [inline]
 __dev_direct_xmit+0x43d/0x640 net/core/dev.c:4309
 dev_direct_xmit include/linux/netdevice.h:3007 [inline]
 packet_direct_xmit+0x185/0x260 net/packet/af_packet.c:282
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x1c30/0x4a80 net/packet/af_packet.c:3104
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xab/0xe0 net/socket.c:734
 ____sys_sendmsg+0x5c2/0x7a0 net/socket.c:2489
 ___sys_sendmsg+0xd3/0x150 net/socket.c:2543
 __sys_sendmsg+0xb9/0x150 net/socket.c:2572
 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: 0033:0x7f79a6c89109
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 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 b8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f79a7e08168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f79a6d9bf60 RCX: 00007f79a6c89109
RDX: 0000000000000000 RSI: 0000000020000a00 RDI: 0000000000000003
RBP: 00007f79a6ce305d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffe2c2e9aaf R14: 00007f79a7e08300 R15: 0000000000022000
 </TASK>