------------[ cut here ]------------ WARNING: CPU: 1 PID: 4189 at include/linux/skbuff.h:2911 skb_transport_header include/linux/skbuff.h:2911 [inline] WARNING: CPU: 1 PID: 4189 at include/linux/skbuff.h:2911 skb_transport_offset include/linux/skbuff.h:3018 [inline] WARNING: CPU: 1 PID: 4189 at include/linux/skbuff.h:2911 ipgre_xmit+0x894/0x970 net/ipv4/ip_gre.c:639 Modules linked in: CPU: 1 PID: 4189 Comm: syz-executor.3 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 4e 63 d0 f9 48 8b 14 24 e9 be f9 ff ff e8 60 63 d0 f9 e9 02 fa ff ff e8 46 63 d0 f9 e9 55 fa ff ff e8 ac 9f 83 f9 <0f> 0b e9 66 fa ff ff 48 8b 7c 24 08 e8 4b 63 d0 f9 e9 03 f8 ff ff RSP: 0018:ffffc90005727550 EFLAGS: 00010212 RAX: 000000000000021b RBX: 000000000000ffff RCX: ffffc900038b2000 RDX: 0000000000040000 RSI: ffffffff87f6d6c4 RDI: 0000000000000003 RBP: ffff8880239fa3c0 R08: 0000000000000003 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000001 R12: ffff8880405f4000 R13: ffff8880239fa474 R14: 0000000000000004 R15: ffff888079540000 FS: 00007fa3e1032700(0000) GS:ffff8880b9b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000080 CR3: 0000000022209000 CR4: 0000000000350ee0 Call Trace: __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: 0033:0x7fa3dfe89109 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:00007fa3e1032168 EFLAGS: 00000246 ORIG_RAX: 0000000000000133 RAX: ffffffffffffffda RBX: 00007fa3dff9bf60 RCX: 00007fa3dfe89109 RDX: 0000000000000001 RSI: 0000000020005100 RDI: 0000000000000003 RBP: 00007fa3dfee30ad R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000 R13: 00007ffc1d11155f R14: 00007fa3e1032300 R15: 0000000000022000