dlm: myls: can't start dlm_recoverd -4
------------[ cut here ]------------
kobject: '(null)' (ffff88802c5000c8): is not initialized, yet kobject_put() is being called.
WARNING: lib/kobject.c:736 at kobject_put+0x66/0x550 lib/kobject.c:734, CPU#1: iou-wrk-5931/5942
Modules linked in:
CPU: 1 UID: 0 PID: 5942 Comm: iou-wrk-5931 Not tainted syzkaller #0 PREEMPT_{RT,(full)} 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/24/2026
RIP: 0010:kobject_put+0x8e/0x550 lib/kobject.c:734
Code: 87 04 48 89 d8 48 c1 e8 03 48 b9 00 00 00 00 00 fc ff df 80 3c 08 00 74 08 48 89 df e8 2b be f4 f6 48 8b 33 4c 89 f7 48 89 da <67> 48 0f b9 3a eb 05 e8 86 4a 8b f6 4c 8d 73 38 4c 89 f7 be 04 00
RSP: 0018:ffffc90005fe7610 EFLAGS: 00010246
RAX: 1ffff110058a0019 RBX: ffff88802c5000c8 RCX: dffffc0000000000
RDX: ffff88802c5000c8 RSI: 0000000000000000 RDI: ffffffff8fc1aca0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: dffffc0000000000 R11: fffffbfff1f5f467 R12: 1ffff110058a0020
R13: 00000000fffffffc R14: ffffffff8fc1aca0 R15: ffff88802c500000
FS:  00007f8190b556c0(0000) GS:ffff888125d3e000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f80f84c3286 CR3: 000000002bbfc000 CR4: 00000000003526f0
Call Trace:
 <TASK>
 new_lockspace fs/dlm/lockspace.c:617 [inline]
 __dlm_new_lockspace+0x19f0/0x2060 fs/dlm/lockspace.c:638
 device_create_lockspace+0xc7/0x350 fs/dlm/user.c:414
 device_write+0x875/0xed0 fs/dlm/user.c:606
 loop_rw_iter+0x42f/0x6a0 include/linux/uio.h:-1
 io_write+0x11e6/0x1690 io_uring/rw.c:1184
 __io_issue_sqe+0x188/0x4d0 io_uring/io_uring.c:1395
 io_issue_sqe+0x16d/0x1020 io_uring/io_uring.c:1418
 io_wq_submit_work+0x7b4/0xca0 io_uring/io_uring.c:1534
 io_worker_handle_work+0x72e/0x10e0 io_uring/io-wq.c:652
 io_wq_worker+0x452/0xf10 io_uring/io-wq.c:706
 ret_from_fork+0x514/0xb70 arch/x86/kernel/process.c:158
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>
----------------
Code disassembly (best guess):
   0:	87 04 48             	xchg   %eax,(%rax,%rcx,2)
   3:	89 d8                	mov    %ebx,%eax
   5:	48 c1 e8 03          	shr    $0x3,%rax
   9:	48 b9 00 00 00 00 00 	movabs $0xdffffc0000000000,%rcx
  10:	fc ff df
  13:	80 3c 08 00          	cmpb   $0x0,(%rax,%rcx,1)
  17:	74 08                	je     0x21
  19:	48 89 df             	mov    %rbx,%rdi
  1c:	e8 2b be f4 f6       	call   0xf6f4be4c
  21:	48 8b 33             	mov    (%rbx),%rsi
  24:	4c 89 f7             	mov    %r14,%rdi
  27:	48 89 da             	mov    %rbx,%rdx
* 2a:	67 48 0f b9 3a       	ud1    (%edx),%rdi <-- trapping instruction
  2f:	eb 05                	jmp    0x36
  31:	e8 86 4a 8b f6       	call   0xf68b4abc
  36:	4c 8d 73 38          	lea    0x38(%rbx),%r14
  3a:	4c 89 f7             	mov    %r14,%rdi
  3d:	be                   	.byte 0xbe
  3e:	04 00                	add    $0x0,%al