dlm: Try SCTP, if you want to enable multi-link.
dlm: ls1: can't start dlm_recoverd -4
------------[ cut here ]------------
kobject: '(null)' (ffff88805a9d8088): is not initialized, yet kobject_put() is being called.
WARNING: lib/kobject.c:736 at kobject_put+0x66/0x550 lib/kobject.c:734, CPU#0: syz.7.810/9387
Modules linked in:
CPU: 0 UID: 0 PID: 9387 Comm: syz.7.810 Not tainted syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/16/2026
RIP: 0010:kobject_put+0x8e/0x550 lib/kobject.c:734
Code: a2 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 8b 6e 6c f6 48 8b 33 4c 89 f7 48 89 da <67> 48 0f b9 3a eb 05 e8 06 d6 fe f5 4c 8d 73 38 4c 89 f7 be 04 00
RSP: 0018:ffffc90005c879f0 EFLAGS: 00010246
RAX: 1ffff1100b53b011 RBX: ffff88805a9d8088 RCX: dffffc0000000000
RDX: ffff88805a9d8088 RSI: 0000000000000000 RDI: ffffffff906ad370
RBP: 0000000000000000 R08: ffffffff90579d37 R09: 1ffffffff20af3a6
R10: dffffc0000000000 R11: fffffbfff20af3a7 R12: 1ffff1100b53b018
R13: ffffffff9a86d5a8 R14: ffffffff906ad370 R15: 00000000fffffffc
FS:  00007f54e69906c0(0000) GS:ffff888124f4c000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007ffdb0771f58 CR3: 0000000034179000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 new_lockspace fs/dlm/lockspace.c:617 [inline]
 __dlm_new_lockspace+0x1714/0x1cd0 fs/dlm/lockspace.c:638
 device_create_lockspace+0xc7/0x350 fs/dlm/user.c:414
 device_write+0x872/0xed0 fs/dlm/user.c:606
 vfs_write+0x296/0xba0 fs/read_write.c:685
 ksys_write+0x150/0x270 fs/read_write.c:739
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0x174/0x580 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x77/0x7f
RIP: 0033:0x7f54e5b9e019
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:00007f54e6990028 EFLAGS: 00000246 ORIG_RAX: 0000000000000001
RAX: ffffffffffffffda RBX: 00007f54e5e25fa0 RCX: 00007f54e5b9e019
RDX: 0000000000000078 RSI: 0000200000000340 RDI: 0000000000000006
RBP: 00007f54e5c3500c R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f54e5e26038 R14: 00007f54e5e25fa0 R15: 00007ffc31c120b8
 </TASK>
----------------
Code disassembly (best guess):
   0:	a2 04 48 89 d8 48 c1 	movabs %al,0x3e8c148d8894804
   7:	e8 03
   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 8b 6e 6c f6       	call   0xf66c6eac
  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 06 d6 fe f5       	call   0xf5fed63c
  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