skb linear: 00000100: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 00000110: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 skb linear: 00000120: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ------------[ cut here ]------------ offset+2 (13622) > skb_headlen() (10647) WARNING: CPU: 0 PID: 5067 at net/core/dev.c:3287 skb_checksum_help+0x68f/0x730 net/core/dev.c:3286 Modules linked in: CPU: 0 PID: 5067 Comm: syz-executor387 Not tainted 6.8.0-syzkaller-05271-gf99c5f563c17 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 03/27/2024 RIP: 0010:skb_checksum_help+0x68f/0x730 net/core/dev.c:3286 Code: 48 8b 4c 24 10 0f b6 04 01 84 c0 0f 85 89 00 00 00 48 8b 44 24 08 2b 18 48 c7 c7 20 f3 9f 8c 4c 89 f6 89 da e8 42 50 12 f8 90 <0f> 0b 90 90 bb ea ff ff ff e9 cf fc ff ff 48 8b 0c 24 80 e1 07 80 RSP: 0018:ffffc90003a6eba8 EFLAGS: 00010246 RAX: 12c3d6bc2eeaba00 RBX: 0000000000002997 RCX: ffff8880225b1e00 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000000 RBP: dffffc0000000000 R08: ffffffff8157cc12 R09: 1ffff9200074dd14 R10: dffffc0000000000 R11: fffff5200074dd15 R12: 1ffff11005a3bcfe R13: 0000000000003534 R14: 0000000000003536 R15: ffff88802d1de780 FS: 000055556db04380(0000) GS:ffff8880b9400000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 000000002000d000 CR3: 000000004edce000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: skb_csum_hwoffload_help net/core/dev.c:3592 [inline] validate_xmit_skb+0xc1f/0x1120 net/core/dev.c:3635 __dev_queue_xmit+0x1640/0x3b10 net/core/dev.c:4327 dev_queue_xmit include/linux/netdevice.h:3091 [inline] neigh_hh_output include/net/neighbour.h:526 [inline] neigh_output include/net/neighbour.h:540 [inline] ip_finish_output2+0xd41/0x1380 net/ipv4/ip_output.c:235 iptunnel_xmit+0x540/0x9b0 net/ipv4/ip_tunnel_core.c:82 ip_tunnel_xmit+0x20ef/0x2940 net/ipv4/ip_tunnel.c:857 __gre_xmit net/ipv4/ip_gre.c:469 [inline] ipgre_xmit+0x854/0xc30 net/ipv4/ip_gre.c:665 __netdev_start_xmit include/linux/netdevice.h:4903 [inline] netdev_start_xmit include/linux/netdevice.h:4917 [inline] xmit_one net/core/dev.c:3531 [inline] dev_hard_start_xmit+0x26a/0x790 net/core/dev.c:3547 __dev_queue_xmit+0x19f4/0x3b10 net/core/dev.c:4335 packet_snd net/packet/af_packet.c:3081 [inline] packet_sendmsg+0x46a9/0x6130 net/packet/af_packet.c:3113 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0x221/0x270 net/socket.c:745 ____sys_sendmsg+0x525/0x7d0 net/socket.c:2584 ___sys_sendmsg net/socket.c:2638 [inline] __sys_sendmsg+0x2b0/0x3a0 net/socket.c:2667 do_syscall_64+0xfb/0x240 entry_SYSCALL_64_after_hwframe+0x6d/0x75 RIP: 0033:0x7fb54733e4d9 Code: 48 83 c4 28 c3 e8 d7 19 00 00 0f 1f 80 00 00 00 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:00007ffc05f89778 EFLAGS: 00000246 ORIG_RAX: 000000000000002e RAX: ffffffffffffffda RBX: 00007fb54738b390 RCX: 00007fb54733e4d9 RDX: 0000000000000000 RSI: 0000000020002ac0 RDI: 0000000000000003 RBP: 0000000000000003 R08: 0000555500000000 R09: 0000555500000000 R10: 0000000000000004 R11: 0000000000000246 R12: 00007ffc05f897c0 R13: 00007ffc05f89790 R14: 0000000000000001 R15: 00007ffc05f897c0