netlink: 8 bytes leftover after parsing attributes in process `syz-executor1'.
skbuff: skb_under_panic: text:0000000070dd59e6 len:30 put:24 head:000000003cfe5c75 data:00000000713b35cf tail:0x6 end:0xc0 dev:gre0
------------[ cut here ]------------
kernel BUG at net/core/skbuff.c:104!
invalid opcode: 0000 [#1] SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 14361 Comm: syz-executor3 Not tainted 4.15.0-rc8+ #264
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:skb_panic+0x162/0x1f0 net/core/skbuff.c:100
RSP: 0018:ffff8801a39af9f8 EFLAGS: 00010282
RAX: 0000000000000083 RBX: ffff8801a86745c0 RCX: 0000000000000000
RDX: 0000000000000083 RSI: ffffc90004201000 RDI: ffffed0034735f33
RBP: ffff8801a39afa60 R08: 1ffff10034735ed7 R09: 0000000000000000
R10: ffff8801a39af8a0 R11: 0000000000000000 R12: ffffffff861f9020
R13: ffffffff84a31e3d R14: 0000000000000018 R15: ffff8801a8760340
FS:  00007f4823172700(0000) GS:ffff8801db300000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f0b8344bdb8 CR3: 00000001cd542002 CR4: 00000000001626e0
Call Trace:
 skb_under_panic net/core/skbuff.c:114 [inline]
 skb_push+0xce/0xf0 net/core/skbuff.c:1714
 ipgre_header+0x6d/0x4e0 net/ipv4/ip_gre.c:877
 dev_hard_header include/linux/netdevice.h:2721 [inline]
 pppoe_sendmsg+0x58e/0x8b0 drivers/net/ppp/pppoe.c:890
 sock_sendmsg_nosec net/socket.c:638 [inline]
 sock_sendmsg+0xca/0x110 net/socket.c:648
 sock_write_iter+0x31a/0x5d0 net/socket.c:917
 call_write_iter include/linux/fs.h:1772 [inline]
 new_sync_write fs/read_write.c:469 [inline]
 __vfs_write+0x684/0x970 fs/read_write.c:482
 vfs_write+0x189/0x510 fs/read_write.c:544
 SYSC_write fs/read_write.c:589 [inline]
 SyS_write+0xef/0x220 fs/read_write.c:581
 entry_SYSCALL_64_fastpath+0x29/0xa0
RIP: 0033:0x452df9
RSP: 002b:00007f4823171c58 EFLAGS: 00000212 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f4823172700 RCX: 0000000000452df9
RDX: 0000000000000000 RSI: 000000002000fffe RDI: 0000000000000013
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000212 R12: 0000000000000000
R13: 0000000000a2f7ef R14: 00007f48231729c0 R15: 0000000000000000
Code: 04 01 84 c0 74 04 3c 03 7e 23 8b 8b 80 00 00 00 41 57 48 c7 c7 e0 88 1f 86 52 56 4c 89 ea 41 50 4c 89 e6 45 89 f0 e8 b6 bd 28 fd <0f> 0b 4c 89 4d b8 4c 89 45 c0 48 89 75 c8 48 89 55 d0 e8 c7 0a 
RIP: skb_panic+0x162/0x1f0 net/core/skbuff.c:100 RSP: ffff8801a39af9f8
---[ end trace 831f010f3420676c ]---
Kernel panic - not syncing: Fatal exception
Dumping ftrace buffer:
   (ftrace buffer empty)
Kernel Offset: disabled