IPv6: ADDRCONF(NETDEV_CHANGE): veth1_to_bridge: link becomes ready
ip (3958) used greatest stack depth: 24144 bytes left
IPv6: ADDRCONF(NETDEV_UP): veth0: link is not ready
IPv6: ADDRCONF(NETDEV_CHANGE): veth0: link becomes ready
hrtimer: interrupt took 42063 ns
BUG: unable to handle kernel NULL pointer dereference at 0000000000000080
IP: [<ffffffff835aa528>] sock_hold include/net/sock.h:589 [inline]
IP: [<ffffffff835aa528>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
PGD 1cf2de067 PUD 1d8b06067 PMD 0 
Oops: 0002 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 4262 Comm: syz-executor0 Not tainted 4.4.151-g3a2ec58 #86
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff8800b94eb000 task.stack: ffff8800b97d0000
RIP: 0010:[<ffffffff835aa528>]  [<ffffffff835aa528>] sock_hold include/net/sock.h:589 [inline]
RIP: 0010:[<ffffffff835aa528>]  [<ffffffff835aa528>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
RSP: 0018:ffff8800b97d7b48  EFLAGS: 00010246
RAX: 0000000000000000 RBX: ffff8801da30e000 RCX: 0000000000000006
RDX: 1ffff1003b461c30 RSI: ffffffff835a4633 RDI: ffff8801da30e180
RBP: ffff8800b97d7bb8 R08: ffff8800b94eb900 R09: 0000000000000000
R10: 0000000000000000 R11: ffffffff8463a140 R12: ffff8801da2739a8
R13: ffff8800b97d7cd0 R14: ffff8801da273900 R15: ffffffff835a3260
FS:  00007f6670c89700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000080 CR3: 00000001cf365000 CR4: 00000000001606f0
Stack:
 ffffffff81140a6a ffff8801da30e020 ffff8801da273a58 ffff8801da273910
 ffffffff838cbb80 ffff8801da2739b0 ffff8801da273a50 ffff8801da30e0e0
 ffffffff00000000 ffff8801d6c59980 0000000000000000 ffff8801d6c599b0
Call Trace:
 [<ffffffff835ae920>] pppol2tp_connect+0x10f0/0x1910 net/l2tp/l2tp_ppp.c:725
 [<ffffffff82f27838>] SYSC_connect+0x1b8/0x300 net/socket.c:1570
 [<ffffffff82f2a184>] SyS_connect+0x24/0x30 net/socket.c:1551
 [<ffffffff838cc225>] entry_SYSCALL_64_fastpath+0x22/0x9e
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 f1 13 
RIP  [<ffffffff835aa528>] sock_hold include/net/sock.h:589 [inline]
RIP  [<ffffffff835aa528>] l2tp_session_create+0x948/0x1030 net/l2tp/l2tp_core.c:1809
 RSP <ffff8800b97d7b48>
CR2: 0000000000000080
---[ end trace 9e614c419742fa2e ]---