IPVS: sync thread started: state = BACKUP, mcast_ifn = veth1_to_bond, syncid = 0, id = 0
BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
IP: [<ffffffff835a0f78>] sock_hold include/net/sock.h:589 [inline]
IP: [<ffffffff835a0f78>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
PGD 1d702e067 PUD 1d2736067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 1 PID: 9022 Comm: syz-executor3 Not tainted 4.4.141-g1b37d68 #7
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8801bc791800 task.stack: ffff8800b5ab8000
RIP: 0010:[<ffffffff835a0f78>]  [<ffffffff835a0f78>] sock_hold include/net/sock.h:589 [inline]
RIP: 0010:[<ffffffff835a0f78>]  [<ffffffff835a0f78>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
RSP: 0018:ffff8800b5abfad0  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801d18d1680 RCX: ffffc90000e31000
RDX: 1ffff1003a31a300 RSI: ffffffff8359b053 RDI: ffff8801d18d1800
RBP: ffff8800b5abfb40 R08: ffff8801bc792100 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff84638de0 R12: ffff8800b091f228
R13: ffff8800b5abfc58 R14: ffff8800b091f180 R15: ffffffff8359ab30
FS:  0000000000000000(0000) GS:ffff8801db300000(0063) knlGS:00000000f5737b40
CS:  0010 DS: 002b ES: 002b CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000001c95ed000 CR4: 00000000001606f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Stack:
 ffffffff8113da8a ffff8801d18d16a0 ffff8800b091f2d8 ffff8800b091f190
 ffffffff838c2570 ffff8800b091f230 ffff8800b091f2d0 ffff8801d18d1760
 09c97ae600000000 ffff8801c7ea6e80 0000000000000000 ffff8801c7ea6eb0
Call Trace:
 [<ffffffff835a5370>] pppol2tp_connect+0x10f0/0x1910 net/l2tp/l2tp_ppp.c:725
 [<ffffffff82f1ec78>] SYSC_connect+0x1b8/0x300 net/socket.c:1557
 [<ffffffff82f215b4>] SyS_connect+0x24/0x30 net/socket.c:1538
 [<ffffffff81006d96>] do_syscall_32_irqs_on arch/x86/entry/common.c:393 [inline]
 [<ffffffff81006d96>] do_fast_syscall_32+0x326/0x8b0 arch/x86/entry/common.c:460
 [<ffffffff838c456a>] sysenter_flags_fixed+0xd/0x17
Code: 00 00 48 8d bb 80 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 36 06 00 00 48 8b 83 80 01 00 00 <f0> ff 80 80 00 00 00 48 8d 43 20 48 89 c7 48 89 45 b0 e8 91 13 
RIP  [<ffffffff835a0f78>] sock_hold include/net/sock.h:589 [inline]
RIP  [<ffffffff835a0f78>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
 RSP <ffff8800b5abfad0>
CR2: 0000000000000080
PM: Marking nosave pages: [mem 0x00000000-0x00000fff]
PM: Marking nosave pages: [mem 0x0009f000-0x000fffff]
PM: Marking nosave pages: [mem 0xbfff3000-0xffffffff]
PM: Basic memory bitmaps created
---[ end trace b8ae4f5a976164af ]---