------------[ cut here ]------------
WARNING: CPU: 0 PID: 17814 at include/linux/skbuff.h:2850 skb_mac_header include/linux/skbuff.h:2850 [inline]
WARNING: CPU: 0 PID: 17814 at include/linux/skbuff.h:2850 ip6erspan_tunnel_xmit+0x1d9c/0x2d90 net/ipv6/ip6_gre.c:962
Modules linked in:
CPU: 0 PID: 17814 Comm: syz-executor.2 Not tainted 6.2.0-rc8-syzkaller-00083-g3ac88fa4605e #0
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.14.0-2 04/01/2014
RIP: 0010:skb_mac_header include/linux/skbuff.h:2850 [inline]
RIP: 0010:ip6erspan_tunnel_xmit+0x1d9c/0x2d90 net/ipv6/ip6_gre.c:962
Code: 04 02 41 01 de 84 c0 74 08 3c 03 0f 8e 1c 0a 00 00 45 89 b4 24 c8 00 00 00 c6 85 77 fe ff ff 01 e9 e5 e6 ff ff e8 04 63 d3 f8 <0f> 0b e9 68 e7 ff ff e8 f8 62 d3 f8 49 8d bf f0 0c 00 00 48 b8 00
RSP: 0018:ffffc90006adf818 EFLAGS: 00010216
RAX: 00000000000009c1 RBX: 000000000000ffff RCX: ffffc900078c2000
RDX: 0000000000040000 RSI: ffffffff88ada60c RDI: 0000000000000003
RBP: ffffc90006adf9c0 R08: 0000000000000003 R09: 000000000000ffff
R10: 000000000000ffff R11: 0000000000000000 R12: ffff8880785ae000
R13: 00000000000000d0 R14: ffff8880542db8d0 R15: ffff888075fc4000
FS:  0000000000000000(0000) GS:ffff88802c600000(0063) knlGS:00000000f7f96b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000000 CR3: 000000006ee1d000 CR4: 0000000000150ef0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 __netdev_start_xmit include/linux/netdevice.h:4863 [inline]
 netdev_start_xmit include/linux/netdevice.h:4877 [inline]
 __dev_direct_xmit+0x504/0x730 net/core/dev.c:4297
 dev_direct_xmit include/linux/netdevice.h:3046 [inline]
 packet_direct_xmit+0x1b7/0x2c0 net/packet/af_packet.c:282
 packet_snd net/packet/af_packet.c:3073 [inline]
 packet_sendmsg+0x334c/0x5500 net/packet/af_packet.c:3104
 sock_sendmsg_nosec net/socket.c:714 [inline]
 sock_sendmsg+0xd3/0x120 net/socket.c:734
 __sys_sendto+0x23a/0x340 net/socket.c:2120
 __do_sys_sendto net/socket.c:2132 [inline]
 __se_sys_sendto net/socket.c:2128 [inline]
 __ia32_sys_sendto+0xdf/0x1b0 net/socket.c:2128
 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+0x33/0x70 arch/x86/entry/common.c:203
 entry_SYSENTER_compat_after_hwframe+0x70/0x82
RIP: 0023:0xf7fbc549
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:00000000f7f965cc EFLAGS: 00000296 ORIG_RAX: 0000000000000171
RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000020000040
RBP: 0000000000000014 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