kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory accessgeneral protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 9453 Comm: syz-executor3 Not tainted 4.4.125-g38f41ec #63
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801d4f16000 task.stack: ffff8800b6be0000
RIP: 0010:[<ffffffff83468b00>]  [<ffffffff83468b00>] __read_once_size include/linux/compiler.h:218 [inline]
RIP: 0010:[<ffffffff83468b00>]  [<ffffffff83468b00>] sk_dst_get include/net/sock.h:1740 [inline]
RIP: 0010:[<ffffffff83468b00>]  [<ffffffff83468b00>] pppol2tp_connect+0x7e0/0x1930 net/l2tp/l2tp_ppp.c:755
RSP: 0018:ffff8800b6be7bc8  EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801d677b680 RCX: ffffffff83468ae8
RDX: 000000000000003b RSI: ffffc900024e1000 RDI: 00000000000001d8
RBP: ffff8800b6be7d78 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 1ffff10016d7cf44 R12: ffff8801d95d2a80
R13: 0000000000000000 R14: 00000000000024ed R15: 1ffff10016d7cf82
FS:  00007fe0b0ef9700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00000000205fafd2 CR3: 00000000b2518000 CR4: 0000000000160670
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff83468a89 00000013b6c42fc0 ffff880000000003 ffff8801d677b818
 ffff8801d677a680 ffff8801d95d2e50 ffff8801d95d2a92 ffff8801d95d2ab0
 ffff8801d677a500 0000000041b58ab3 ffffffff84011a60 ffffffff83468320
Call Trace:
 [<ffffffff82df21b6>] SYSC_connect+0x1b6/0x310 net/socket.c:1557
 [<ffffffff82df4a24>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff83779965>] entry_SYSCALL_64_fastpath+0x22/0x9e
Code: fd 80 3d 69 3d 37 01 00 0f 84 ca 08 00 00 e8 98 8b ef fd 49 8d bd d8 01 00 00 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <80> 3c 02 00 0f 85 60 0d 00 00 4d 8b b5 d8 01 00 00 e8 aa d8 e1 
RIP  [<ffffffff83468b00>] __read_once_size include/linux/compiler.h:218 [inline]
RIP  [<ffffffff83468b00>] sk_dst_get include/net/sock.h:1740 [inline]
RIP  [<ffffffff83468b00>] pppol2tp_connect+0x7e0/0x1930 net/l2tp/l2tp_ppp.c:755
 RSP <ffff8800b6be7bc8>
---[ end trace 023039890ebf902f ]---