ocfs2: Readonly device (7,0) detected. Cluster services will not be used for this mount. Recovery will be skipped.
ocfs2: Mounting device (7,0) on (node local, slot 65535) with writeback data mode.
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: 8456 Comm: syz.0.424 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
 assign_lock_key+0x133/0x150
 register_lock_class+0xcc/0x2e0
 __lock_acquire+0xad/0x2cf0
 lock_acquire+0xf0/0x2e0
 _raw_spin_lock_irqsave+0x40/0x60
 ocfs2_mark_lockres_freeing+0x164/0x840
 ocfs2_dlm_shutdown+0x3a/0x240
 ocfs2_dismount_volume+0x468/0x900
 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+0xed/0x480
 do_syscall_64+0x32d/0xf80
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f821c59da0a
Code: 48 c7 c2 e8 ff ff ff f7 d8 64 89 02 b8 ff ff ff ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 49 89 ca b8 a5 00 00 00 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:00007f821d39ee58 EFLAGS: 00000246 ORIG_RAX: 00000000000000a5
RAX: ffffffffffffffec RBX: 00007f821d39eee0 RCX: 00007f821c59da0a
RDX: 0000200000004480 RSI: 00002000000044c0 RDI: 00007f821d39eea0
RBP: 0000200000004480 R08: 00007f821d39eee0 R09: 0000000001808001
R10: 0000000001808001 R11: 0000000000000246 R12: 00002000000044c0
R13: 00007f821d39eea0 R14: 0000000000004470 R15: 0000200000000000
 </TASK>
ocfs2: Unmounting device (7,0) on (node local)
