------------[ cut here ]------------
WARNING: CPU: 0 PID: 23917 at include/linux/skbuff.h:2911 skb_transport_header include/linux/skbuff.h:2911 [inline]
WARNING: CPU: 0 PID: 23917 at include/linux/skbuff.h:2911 skb_transport_offset include/linux/skbuff.h:3018 [inline]
WARNING: CPU: 0 PID: 23917 at include/linux/skbuff.h:2911 ipgre_xmit+0x894/0x970 net/ipv4/ip_gre.c:639
Modules linked in:
CPU: 0 PID: 23917 Comm: syz-executor.1 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+0x894/0x970 net/ipv4/ip_gre.c:639
Code: 89 14 24 e8 fe 49 cf f9 48 8b 14 24 e9 be f9 ff ff e8 10 4a cf f9 e9 02 fa ff ff e8 f6 49 cf f9 e9 55 fa ff ff e8 ec 25 83 f9 <0f> 0b e9 66 fa ff ff 48 8b 7c 24 08 e8 fb 49 cf f9 e9 03 f8 ff ff
RSP: 0018:ffffc90009dc7550 EFLAGS: 00010212
RAX: 00000000000001cc RBX: 000000000000ffff RCX: ffffc90003a2c000
RDX: 0000000000040000 RSI: ffffffff87f68164 RDI: 0000000000000003
RBP: ffff88807e9c1300 R08: 0000000000000003 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000001 R12: ffff888023b4c000
R13: ffff88807e9c13b4 R14: 0000000000000004 R15: ffff88807a5fd000
FS:  00007f44f1a49700(0000) GS:ffff8880b9a00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020000000 CR3: 0000000078a05000 CR4: 00000000003506f0
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+0x188/0x880 net/core/dev.c:3604
 __dev_queue_xmit+0x2b1d/0x3900 net/core/dev.c:4253
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x21cb/0x5550 net/packet/af_packet.c:3104
 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: 0033:0x7f44f0889109
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:00007f44f1a49168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133
RAX: ffffffffffffffda RBX: 00007f44f099bf60 RCX: 00007f44f0889109
RDX: 0000000000000001 RSI: 000000002000e0c0 RDI: 0000000000000003
RBP: 00007f44f08e30ad R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000060 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fffef01ed3f R14: 00007f44f1a49300 R15: 0000000000022000
 </TASK>