ODEBUG: object ffff8801db307ce8 is NOT on stack ffff88019e570000, but annotated
------------[ cut here ]------------
kasan: CONFIG_KASAN_INLINE enabled
kasan: GPF could be caused by NULL-ptr deref or user memory access
general protection fault: 0000 [#1] PREEMPT SMP KASAN
Dumping ftrace buffer:
   (ftrace buffer empty)
Modules linked in:
CPU: 0 PID: 8809 Comm: syz-executor0 Not tainted 4.9.117-g8b21e85 #19
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
task: ffff88019dc9b000 task.stack: ffff8801ccaa8000
RIP: 0010:[<ffffffff81236c0b>]  [<ffffffff81236c0b>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
RSP: 0018:ffff8801ccaaf6a0  EFLAGS: 00010006
RAX: dffffc0000000000 RBX: 0000000000000000 RCX: 0000000000000000
RDX: 0000000000000014 RSI: 0000000000000000 RDI: 00000000000000a0
RBP: ffff8801ccaaf848 R08: 0000000000000001 R09: 0000000000000000
R10: ffff88019dc9b000 R11: 0000000000000001 R12: 0000000000000001
R13: 0000000000000000 R14: 00000000000000a0 R15: 0000000000000000
FS:  00007f99978ce700(0000) GS:ffff8801db200000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9fe2f94000 CR3: 00000001ba7f5000 CR4: 00000000001606f0
DR0: 0000000020000000 DR1: 0000000020000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000600
Stack:
 0000000000000000 0000000000000000 0000000000000000 0000000000000286
 ffffffffffffff10 ffffffff839fc30f 0000000000000010 0000000000000286
 0000000000000286 ffff8801ccaaf708 ffffffff839fc2f5 0000000000000000
Call Trace:
 [<ffffffff8123acd0>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff839fbfa6>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff839fbfa6>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff836bebdb>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff836bebdb>] l2tp_xmit_skb+0x38b/0xf60 net/l2tp/l2tp_core.c:1233
 [<ffffffff836caa90>] pppol2tp_sendmsg+0x4e0/0x790 net/l2tp/l2tp_ppp.c:339
 [<ffffffff83018fcc>] sock_sendmsg_nosec net/socket.c:635 [inline]
 [<ffffffff83018fcc>] sock_sendmsg+0xcc/0x110 net/socket.c:645
 [<ffffffff8301a7ea>] ___sys_sendmsg+0x47a/0x840 net/socket.c:1969
 [<ffffffff8301cd41>] __sys_sendmmsg+0x161/0x3d0 net/socket.c:2059
 [<ffffffff8301cfe5>] SYSC_sendmmsg net/socket.c:2090 [inline]
 [<ffffffff8301cfe5>] SyS_sendmmsg+0x35/0x60 net/socket.c:2085
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839fcc13>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb
Code: 25 28 00 00 00 0f 85 17 27 00 00 48 8d 65 d8 5b 41 5c 41 5d 41 5e 41 5f 5d c3 48 b8 00 00 00 00 00 fc ff df 4c 89 f2 48 c1 ea 03 <80> 3c 02 00 0f 85 51 27 00 00 49 81 3e a0 8c e9 84 0f 84 08 f7 
RIP  [<ffffffff81236c0b>] __lock_acquire+0xa1b/0x4070 kernel/locking/lockdep.c:3224
 RSP <ffff8801ccaaf6a0>
---[ end trace 4c23dbc509f26b77 ]---