------------[ cut here ]------------ WARNING: CPU: 0 PID: 19032 at include/linux/skbuff.h:2796 skb_mac_header_len include/linux/skbuff.h:2796 [inline] WARNING: CPU: 0 PID: 19032 at include/linux/skbuff.h:2796 skb_tunnel_check_pmtu+0x5de/0x2f90 net/ipv4/ip_tunnel_core.c:413 Modules linked in: CPU: 0 PID: 19032 Comm: syz-executor.4 Not tainted 5.19.0-rc3-syzkaller-00590-gc83bc86a0596 #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:2796 [inline] RIP: 0010:skb_tunnel_check_pmtu+0x5de/0x2f90 net/ipv4/ip_tunnel_core.c:413 Code: 00 00 00 00 fc ff df 4c 89 fa 48 c1 ea 03 80 3c 02 00 0f 84 b9 fe ff ff 4c 89 ff e8 bc 09 d7 f9 e9 ac fe ff ff e8 a2 0e 8a f9 <0f> 0b e9 28 fc ff ff e8 96 0e 8a f9 48 8b 54 24 70 48 b8 00 00 00 RSP: 0018:ffffc9000919f700 EFLAGS: 00010212 RAX: 0000000000000298 RBX: ffff88806f5c4000 RCX: ffffc90006622000 RDX: 0000000000040000 RSI: ffffffff87f066ee RDI: 0000000000000003 RBP: ffffc9000919f828 R08: 0000000000000003 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000000 R12: 000000000000ffff R13: 0000000000000000 R14: 000000000000ffcd R15: 000000000000000e FS: 00007fc9b92ac700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007fc9b80dc980 CR3: 000000001d90a000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: geneve_xmit_skb drivers/net/geneve.c:927 [inline] geneve_xmit+0xcf8/0x35d0 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+0x500/0x730 net/core/dev.c:4311 dev_direct_xmit include/linux/netdevice.h:3007 [inline] packet_direct_xmit+0x1b8/0x2c0 net/packet/af_packet.c:282 packet_snd net/packet/af_packet.c:3073 [inline] packet_sendmsg+0x21f4/0x55d0 net/packet/af_packet.c:3104 sock_sendmsg_nosec net/socket.c:714 [inline] sock_sendmsg+0xcf/0x120 net/socket.c:734 __sys_sendto+0x21a/0x320 net/socket.c:2116 __do_sys_sendto net/socket.c:2128 [inline] __se_sys_sendto net/socket.c:2124 [inline] __x64_sys_sendto+0xdd/0x1b0 net/socket.c:2124 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: 0033:0x7fc9b8089109 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:00007fc9b92ac168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007fc9b819bf60 RCX: 00007fc9b8089109 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003 RBP: 00007fc9b80e305d R08: 0000000020000000 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffe1b8bbf8f R14: 00007fc9b92ac300 R15: 0000000000022000