BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 26092 Comm: syz.2.6691 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Call Trace:
 <TASK>
 dump_stack_lvl+0xe8/0x150
 register_lock_class+0x2a9/0x2e0
 __lock_acquire+0xae/0x2cf0
 lock_acquire+0x107/0x340
 _raw_spin_lock_bh+0x36/0x50
 netif_set_real_num_tx_queues+0x77a/0xa40
 __tun_detach+0xdc6/0x15d0
 tun_chr_close+0x10a/0x1c0
 __fput+0x44c/0xa70
 task_work_run+0x1d4/0x260
 exit_to_user_mode_loop+0xef/0x4e0
 do_syscall_64+0x2b7/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f60ab78f7c9
Code: ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 a8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007fff9402fbd8 EFLAGS: 00000246 ORIG_RAX: 00000000000001b4
RAX: 0000000000000000 RBX: 0000000000063cfd RCX: 00007f60ab78f7c9
RDX: 0000000000000000 RSI: 000000000000001e RDI: 0000000000000003
RBP: 00007f60ab9e7da0 R08: 0000000000000001 R09: 0000001c9402fecf
R10: 0000001b30720000 R11: 0000000000000246 R12: 00007f60ab9e5fac
R13: 00007f60ab9e5fa0 R14: ffffffffffffffff R15: 00007fff9402fcf0
 </TASK>
