INFO: trying to register non-static key.
The code is fine but needs lockdep annotation, or maybe
you didn't initialize this object before use?
turning off the locking correctness validator.
CPU: 1 UID: 0 PID: 22126 Comm: syz-executor Not tainted syzkaller #0 PREEMPT_{RT,(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
 assign_lock_key+0x133/0x150
 register_lock_class+0xcc/0x2e0
 __lock_acquire+0xad/0x2d10
 lock_acquire+0x106/0x350
 rt_spin_lock+0x83/0x400
 ocfs2_mark_lockres_freeing+0x171/0x820
 ocfs2_dlm_shutdown+0x3a/0x240
 ocfs2_dismount_volume+0x468/0x8d0
 generic_shutdown_super+0x13d/0x2d0
 kill_block_super+0x44/0x90
 deactivate_locked_super+0xbc/0x130
 cleanup_mnt+0x437/0x4d0
 task_work_run+0x1d9/0x270
 exit_to_user_mode_loop+0xf3/0x4d0
 do_syscall_64+0x33e/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f69f1f7e017
Code: a2 c7 05 dc 06 25 00 00 00 00 00 eb 96 e8 e1 12 00 00 90 31 f6 e9 09 00 00 00 66 0f 1f 84 00 00 00 00 00 b8 a6 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 01 c3 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8
RSP: 002b:00007fffeb2d86a8 EFLAGS: 00000246 ORIG_RAX: 00000000000000a6
RAX: 0000000000000000 RBX: 00007f69f2012120 RCX: 00007f69f1f7e017
RDX: 0000000000000000 RSI: 0000000000000009 RDI: 00007fffeb2d8760
RBP: 00007fffeb2d8760 R08: 00007fffeb2d9760 R09: 00000000ffffffff
R10: 0000000000000000 R11: 0000000000000246 R12: 00007fffeb2d97f0
R13: 00007f69f2012120 R14: 000000000010b6d3 R15: 00007fffeb2d9830
 </TASK>
ocfs2: Unmounting device (7,7) on (node local)
__loop_clr_fd(loop7) clearing lo_backing_file with raw_refcnt=0x0, refcnt=1
