syzbot

INFO: trying to register non-static key.
the code is fine but needs lockdep annotation.
turning off the locking correctness validator.
CPU: 1 PID: 4387 Comm: syz-executor168 Not tainted 4.9.99-gc2f9bce #25
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
 ffff8801d9387790 ffffffff81eb0f09 0000000000000000 ffffffff85b2d700
 ffff8801cfeeb020 ffffffff85583c08 0000000000000000 ffff8801d9387810
 ffffffff81230b40 ffffffff8558c640 ffff8801d3fc9880 000000000000377a
Call Trace:
 [<ffffffff81eb0f09>] __dump_stack lib/dump_stack.c:15 [inline]
 [<ffffffff81eb0f09>] dump_stack+0xc1/0x128 lib/dump_stack.c:51
 [<ffffffff81230b40>] register_lock_class+0x1460/0x1470 kernel/locking/lockdep.c:738
 [<ffffffff812344e9>] __lock_acquire+0x169/0x4070 kernel/locking/lockdep.c:3233
 [<ffffffff81238e60>] lock_acquire+0x130/0x3e0 kernel/locking/lockdep.c:3756
 [<ffffffff839f3a16>] __raw_spin_lock include/linux/spinlock_api_smp.h:144 [inline]
 [<ffffffff839f3a16>] _raw_spin_lock+0x36/0x50 kernel/locking/spinlock.c:151
 [<ffffffff8280e30d>] spin_lock include/linux/spinlock.h:302 [inline]
 [<ffffffff8280e30d>] ptr_ring_consume include/linux/ptr_ring.h:268 [inline]
 [<ffffffff8280e30d>] skb_array_consume include/linux/skb_array.h:97 [inline]
 [<ffffffff8280e30d>] tun_ring_recv drivers/net/tun.c:1477 [inline]
 [<ffffffff8280e30d>] tun_do_read.part.42+0x74d/0x1250 drivers/net/tun.c:1514
 [<ffffffff828105b1>] tun_do_read drivers/net/tun.c:1536 [inline]
 [<ffffffff828105b1>] tun_chr_read_iter+0x161/0x1f0 drivers/net/tun.c:1536
 [<ffffffff8156e8cd>] new_sync_read fs/read_write.c:439 [inline]
 [<ffffffff8156e8cd>] __vfs_read+0x3dd/0x570 fs/read_write.c:451
 [<ffffffff8156fdd0>] vfs_read+0x120/0x380 fs/read_write.c:472
 [<ffffffff81574215>] SYSC_pread64 fs/read_write.c:626 [inline]
 [<ffffffff81574215>] SyS_pread64+0x145/0x170 fs/read_write.c:613
 [<ffffffff81006316>] do_syscall_64+0x1a6/0x490 arch/x86/entry/common.c:282
 [<ffffffff839f4653>] entry_SYSCALL_64_after_swapgs+0x5d/0xdb