------------[ cut here ]------------
WARNING: CPU: 1 PID: 5826 at include/linux/skbuff.h:2911 skb_transport_offset include/linux/skbuff.h:3018 [inline]
WARNING: CPU: 1 PID: 5826 at include/linux/skbuff.h:2911 ipgre_xmit+0x7d4/0xa80 net/ipv4/ip_gre.c:639
Modules linked in:
CPU: 1 PID: 5826 Comm: syz-executor.4 Not tainted 5.19.0-rc1-syzkaller-00024-g6bfb56e93bce #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:skb_transport_header include/linux/skbuff.h:2911 [inline]
RIP: 0010:skb_transport_offset include/linux/skbuff.h:3018 [inline]
RIP: 0010:ipgre_xmit+0x7d4/0xa80 net/ipv4/ip_gre.c:639
Code: 4c 8b 6c 24 10 49 bf 00 00 00 00 00 fc ff df 74 0a e8 a0 d1 a7 f8 e9 b3 f9 ff ff e8 96 d1 a7 f8 e9 64 fe ff ff e8 8c d1 a7 f8 <0f> 0b e9 24 fd ff ff 44 89 f1 80 e1 07 fe c1 38 c1 0f 8c 5a f8 ff
RSP: 0018:ffffc90004a576f8 EFLAGS: 00010287
RAX: ffffffff88dfc534 RBX: 000000000000ffff RCX: 0000000000040000
RDX: ffffc90014903000 RSI: 00000000000000d3 RDI: 00000000000000d4
RBP: ffff888064d59710 R08: ffffffff88dfc24e R09: fffffbfff1c06fce
R10: fffffbfff1c06fce R11: 1ffffffff1c06fcd R12: ffff888064d59640
R13: ffff88806dbea000 R14: 1ffff1100c9ab2de R15: ffff888064d596f6
FS:  00007f4ef1cd2700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000140 CR3: 00000000771f5000 CR4: 00000000003506e0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __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+0x1af/0x3e0 net/core/dev.c:3604
 __dev_queue_xmit+0x1c36/0x38d0 net/core/dev.c:4253
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x326f/0x4d40 net/packet/af_packet.c:3104
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg net/socket.c:734 [inline]
 __sys_sendto+0x439/0x5c0 net/socket.c:2119
 __do_sys_sendto net/socket.c:2131 [inline]
 __se_sys_sendto net/socket.c:2127 [inline]
 __x64_sys_sendto+0xda/0xf0 net/socket.c:2127
 do_syscall_x64 arch/x86/entry/common.c:50 [inline]
 do_syscall_64+0x2b/0x70 arch/x86/entry/common.c:80
 entry_SYSCALL_64_after_hwframe+0x46/0xb0
RIP: 0033:0x7f4ef0a89109
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:00007f4ef1cd2168 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f4ef0b9bf60 RCX: 00007f4ef0a89109
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f4ef0ae30ad R08: 0000000020000140 R09: 0000000000000080
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffc8f57a0af R14: 00007f4ef1cd2300 R15: 0000000000022000
 </TASK>