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: 10929 Comm: syz-executor5 Not tainted 4.4.146-g1396226 #15
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801bdf71800 task.stack: ffff8800a3ad0000
RIP: 0010:[<ffffffff835aa8c3>]  [<ffffffff835aa8c3>] __read_once_size include/linux/compiler.h:218 [inline]
RIP: 0010:[<ffffffff835aa8c3>]  [<ffffffff835aa8c3>] sk_dst_get include/net/sock.h:1740 [inline]
RIP: 0010:[<ffffffff835aa8c3>]  [<ffffffff835aa8c3>] pppol2tp_connect+0x873/0x1910 net/l2tp/l2tp_ppp.c:762
RSP: 0018:ffff8800a3ad7b50  EFLAGS: 00010202
RAX: dffffc0000000000 RBX: ffff8801d0c55d80 RCX: ffffc900042b7000
RDX: 000000000000003b RSI: ffffffff835aa8ab RDI: 00000000000001d8
RBP: ffff8800a3ad7d00 R08: ffff8801bdf72128 R09: 0000000000000000
R10: 0000000000000001 R11: ffff8801bdf71800 R12: ffff8800b91e4c80
R13: ffff8801d0c55db0 R14: 0000000000000000 R15: ffff8800b91e5680
FS:  0000000000000000(0000) GS:ffff8801db200000(0063) knlGS:00000000f5759b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 00000000080e809c CR3: 00000001cc00f000 CR4: 00000000001606f0
Stack:
 ffffffff835aa84b 0000000200000015 ffff8800a3ad7c58 ffff880000000003
 ffff8801d0c56150 ffff8801d0c55d92 1ffff1001475af73 ffff8800b91e4e18
 ffff8800b91e5800 0000000041b58ab3 ffffffff8424e460 ffffffff835aa050
Call Trace:
 [<ffffffff82f240b8>] SYSC_connect+0x1b8/0x300 net/socket.c:1558
 [<ffffffff82f269f4>] SyS_connect+0x24/0x30 net/socket.c:1539
 [<ffffffff81006d94>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d94>] do_fast_syscall_32+0x324/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838ca383>] sysenter_flags_fixed+0xd/0x1a
Code: fd 80 3d ce ab 45 01 00 0f 84 44 09 00 00 e8 05 8f da fd 49 8d be 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 be d8 01 00 00 e8 f7 ed cc 
RIP  [<ffffffff835aa8c3>] __read_once_size include/linux/compiler.h:218 [inline]
RIP  [<ffffffff835aa8c3>] sk_dst_get include/net/sock.h:1740 [inline]
RIP  [<ffffffff835aa8c3>] pppol2tp_connect+0x873/0x1910 net/l2tp/l2tp_ppp.c:762
 RSP <ffff8800a3ad7b50>
---[ end trace 8d1c0746c8faa362 ]---