------------[ cut here ]------------
WARNING: CPU: 1 PID: 19525 at include/linux/skbuff.h:2911 skb_transport_header include/linux/skbuff.h:2911 [inline]
WARNING: CPU: 1 PID: 19525 at include/linux/skbuff.h:2911 skb_transport_offset include/linux/skbuff.h:3018 [inline]
WARNING: CPU: 1 PID: 19525 at include/linux/skbuff.h:2911 ipgre_xmit+0x894/0x970 net/ipv4/ip_gre.c:639
Modules linked in:
CPU: 1 PID: 19525 Comm: syz-executor.1 Not tainted 5.18.0-syzkaller-12183-g08c79c9cd67f #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 ae 2a d1 f9 48 8b 14 24 e9 be f9 ff ff e8 c0 2a d1 f9 e9 02 fa ff ff e8 a6 2a d1 f9 e9 55 fa ff ff e8 9c 33 84 f9 <0f> 0b e9 66 fa ff ff 48 8b 7c 24 08 e8 ab 2a d1 f9 e9 03 f8 ff ff
RSP: 0018:ffffc9000f7a7690 EFLAGS: 00010212
RAX: 0000000000000208 RBX: 000000000000ffff RCX: ffffc90013c60000
RDX: 0000000000040000 RSI: ffffffff87f650b4 RDI: 0000000000000003
RBP: ffff888056764dc0 R08: 0000000000000003 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000001 R12: ffff888045c52000
R13: ffff888056764e74 R14: 0000000000000004 R15: ffff888025c57c00
FS:  00007f73a7956700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000020004000 CR3: 00000000409a3000 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+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+0x6eb/0x810 net/socket.c:2492
 ___sys_sendmsg+0xf3/0x170 net/socket.c:2546
 __sys_sendmsg net/socket.c:2575 [inline]
 __do_sys_sendmsg net/socket.c:2584 [inline]
 __se_sys_sendmsg net/socket.c:2582 [inline]
 __x64_sys_sendmsg+0x132/0x220 net/socket.c:2582
 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: 0033:0x7f73a6889109
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:00007f73a7956168 EFLAGS: 00000246 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 00007f73a699c030 RCX: 00007f73a6889109
RDX: 0000000000004080 RSI: 0000000020000a00 RDI: 0000000000000004
RBP: 00007f73a68e305d R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007ffd769b6c2f R14: 00007f73a7956300 R15: 0000000000022000
 </TASK>