BUG: MAX_LOCKDEP_KEYS too low!
turning off the locking correctness validator.
CPU: 0 UID: 0 PID: 17918 Comm: syz.2.1994 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014
Call Trace:
 <TASK>
 __dump_stack lib/dump_stack.c:94 [inline]
 dump_stack_lvl+0x100/0x190 lib/dump_stack.c:120
 register_lock_class+0x4a4/0x560 kernel/locking/lockdep.c:1332
 __lock_acquire+0x3cb/0x2630 kernel/locking/lockdep.c:5112
 lock_acquire kernel/locking/lockdep.c:5868 [inline]
 lock_acquire+0x1b1/0x370 kernel/locking/lockdep.c:5825
 touch_wq_lockdep_map+0xad/0x1c0 kernel/workqueue.c:4029
 __flush_workqueue+0x131/0x1200 kernel/workqueue.c:4071
 drain_workqueue+0x175/0x3b0 kernel/workqueue.c:4235
 destroy_workqueue+0xc3/0xa30 kernel/workqueue.c:6053
 xfs_destroy_mount_workqueues+0x65/0x150 fs/xfs/xfs_super.c:651
 xfs_fs_fill_super+0x98f/0x1f60 fs/xfs/xfs_super.c:1970
 get_tree_bdev_flags+0x38c/0x620 fs/super.c:1694
 vfs_get_tree+0x92/0x320 fs/super.c:1754
 fc_mount fs/namespace.c:1193 [inline]
 do_new_mount_fc fs/namespace.c:3758 [inline]
 do_new_mount fs/namespace.c:3834 [inline]
 path_mount+0x7d0/0x23d0 fs/namespace.c:4154
 do_mount fs/namespace.c:4167 [inline]
 __do_sys_mount fs/namespace.c:4383 [inline]
 __se_sys_mount fs/namespace.c:4360 [inline]
 __x64_sys_mount+0x293/0x310 fs/namespace.c:4360
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x115/0x870 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7fa2abf9ce59
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 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 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007ffe93e0d218 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffda RBX: 00007fa2ac215fa0 RCX: 00007fa2abf9ce59
RDX: 0000200000001200 RSI: 00002000000000c0 RDI: 0000200000000240
RBP: 00007fa2ac032d6f R08: 0000000000000000 R09: 0000000000000000
R10: 000000000280c002 R11: 0000000000000246 R12: 0000000000000000
R13: 00007fa2ac215fac R14: 00007fa2ac215fa0 R15: 00007fa2ac215fa0
 </TASK>