------------[ cut here ]------------
WARNING: CPU: 0 PID: 4981 at include/linux/skbuff.h:2904 skb_transport_header include/linux/skbuff.h:2904 [inline]
WARNING: CPU: 0 PID: 4981 at include/linux/skbuff.h:2904 skb_transport_offset include/linux/skbuff.h:3011 [inline]
WARNING: CPU: 0 PID: 4981 at include/linux/skbuff.h:2904 ipgre_xmit+0x894/0x970 net/ipv4/ip_gre.c:639
Modules linked in:
CPU: 0 PID: 4981 Comm: syz-executor.1 Not tainted 5.18.0-syzkaller-12007-g17d8e3d90b69 #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:skb_transport_header include/linux/skbuff.h:2904 [inline]
RIP: 0010:skb_transport_offset include/linux/skbuff.h:3011 [inline]
RIP: 0010:ipgre_xmit+0x894/0x970 net/ipv4/ip_gre.c:639
Code: 89 14 24 e8 6e 39 d1 f9 48 8b 14 24 e9 be f9 ff ff e8 80 39 d1 f9 e9 02 fa ff ff e8 66 39 d1 f9 e9 55 fa ff ff e8 4c 79 84 f9 <0f> 0b e9 66 fa ff ff 48 8b 7c 24 08 e8 6b 39 d1 f9 e9 03 f8 ff ff
RSP: 0018:ffffc9000d7ff4a0 EFLAGS: 00010216
RAX: 00000000000010df RBX: 000000000000ffff RCX: ffffc90002ef9000
RDX: 0000000000040000 RSI: ffffffff87f60b04 RDI: 0000000000000003
RBP: ffff888021c87900 R08: 0000000000000003 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000000 R12: ffff888053cde000
R13: ffff888021c879b4 R14: 0000000000000004 R15: ffff888020d30000
FS:  0000000000000000(0000) GS:ffff88802ca00000(0063) knlGS:00000000f7f85b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 000000002fd28000 CR3: 000000002a79b000 CR4: 0000000000150ef0
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+0x2be8/0x3a00 net/core/dev.c:4253
 dev_queue_xmit include/linux/netdevice.h:2994 [inline]
 __bpf_tx_skb net/core/filter.c:2114 [inline]
 __bpf_redirect_no_mac net/core/filter.c:2139 [inline]
 __bpf_redirect+0x838/0xe50 net/core/filter.c:2162
 ____bpf_clone_redirect net/core/filter.c:2429 [inline]
 bpf_clone_redirect+0x2ae/0x420 net/core/filter.c:2401
 bpf_prog_37bec1c0bb1a45ac+0x59/0x5e
 bpf_dispatcher_nop_func include/linux/bpf.h:869 [inline]
 __bpf_prog_run include/linux/filter.h:628 [inline]
 bpf_prog_run include/linux/filter.h:635 [inline]
 bpf_test_run+0x386/0x9d0 net/bpf/test_run.c:402
 bpf_prog_test_run_skb+0xb5e/0x1e10 net/bpf/test_run.c:1155
 bpf_prog_test_run kernel/bpf/syscall.c:3591 [inline]
 __sys_bpf+0x15c1/0x5700 kernel/bpf/syscall.c:4935
 __do_sys_bpf kernel/bpf/syscall.c:5021 [inline]
 __se_sys_bpf kernel/bpf/syscall.c:5019 [inline]
 __ia32_sys_bpf+0x74/0xc0 kernel/bpf/syscall.c:5019
 do_syscall_32_irqs_on arch/x86/entry/common.c:112 [inline]
 __do_fast_syscall_32+0x65/0xf0 arch/x86/entry/common.c:178
 do_fast_syscall_32+0x2f/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x53/0x62
RIP: 0023:0xf7f8a549
Code: 03 74 c0 01 10 05 03 74 b8 01 10 06 03 74 b4 01 10 07 03 74 b0 01 10 08 03 74 d8 01 00 00 00 00 00 51 52 55 89 e5 0f 34 cd 80 <5d> 5a 59 c3 90 90 90 90 8d b4 26 00 00 00 00 8d b4 26 00 00 00 00
RSP: 002b:00000000f7f855cc EFLAGS: 00000296 ORIG_RAX: 0000000000000165
RAX: ffffffffffffffda RBX: 000000000000000a RCX: 0000000020000080
RDX: 0000000000000028 RSI: 0000000000000000 RDI: 0000000000000000
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
 </TASK>
----------------
Code disassembly (best guess):
   0:	03 74 c0 01          	add    0x1(%rax,%rax,8),%esi
   4:	10 05 03 74 b8 01    	adc    %al,0x1b87403(%rip)        # 0x1b8740d
   a:	10 06                	adc    %al,(%rsi)
   c:	03 74 b4 01          	add    0x1(%rsp,%rsi,4),%esi
  10:	10 07                	adc    %al,(%rdi)
  12:	03 74 b0 01          	add    0x1(%rax,%rsi,4),%esi
  16:	10 08                	adc    %cl,(%rax)
  18:	03 74 d8 01          	add    0x1(%rax,%rbx,8),%esi
  1c:	00 00                	add    %al,(%rax)
  1e:	00 00                	add    %al,(%rax)
  20:	00 51 52             	add    %dl,0x52(%rcx)
  23:	55                   	push   %rbp
  24:	89 e5                	mov    %esp,%ebp
  26:	0f 34                	sysenter
  28:	cd 80                	int    $0x80
* 2a:	5d                   	pop    %rbp <-- trapping instruction
  2b:	5a                   	pop    %rdx
  2c:	59                   	pop    %rcx
  2d:	c3                   	retq
  2e:	90                   	nop
  2f:	90                   	nop
  30:	90                   	nop
  31:	90                   	nop
  32:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi
  39:	8d b4 26 00 00 00 00 	lea    0x0(%rsi,%riz,1),%esi