------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 2 PID: 16764 at lib/refcount.c:28 refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Modules linked in:
CPU: 2 UID: 0 PID: 16764 Comm: kworker/2:3 Not tainted 6.16.0-syzkaller-11952-g6e64f4580381 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2~bpo12+1 04/01/2014
Workqueue: md_misc mddev_delayed_delete
RIP: 0010:refcount_warn_saturate+0x14a/0x210 lib/refcount.c:28
Code: ff 89 de e8 48 39 db fc 84 db 0f 85 66 ff ff ff e8 5b 3e db fc c6 05 21 c5 b3 0b 01 90 48 c7 c7 80 84 15 8c e8 b7 2f 9a fc 90 <0f> 0b 90 90 e9 43 ff ff ff e8 38 3e db fc 0f b6 1d fc c4 b3 0b 31
RSP: 0018:ffffc9000327fc10 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000000 RCX: ffffffff817a02c8
RDX: ffff8880264e0000 RSI: ffffffff817a02d5 RDI: 0000000000000001
RBP: ffff8880283b8130 R08: 0000000000000001 R09: 0000000000000000
R10: 0000000000000000 R11: 0000000000000000 R12: ffff8880283b8134
R13: dffffc0000000000 R14: ffff8880283b8130 R15: ffffc9000327fd10
FS:  0000000000000000(0000) GS:ffff8880976cc000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000033011ff8 CR3: 000000004997c000 CR4: 0000000000352ef0
Call Trace:
 <TASK>
 __refcount_sub_and_test include/linux/refcount.h:400 [inline]
 __refcount_dec_and_test include/linux/refcount.h:432 [inline]
 refcount_dec_and_test include/linux/refcount.h:450 [inline]
 kref_put include/linux/kref.h:64 [inline]
 kobject_put+0x230/0x5a0 lib/kobject.c:737
 process_one_work+0x9cc/0x1b70 kernel/workqueue.c:3236
 process_scheduled_works kernel/workqueue.c:3319 [inline]
 worker_thread+0x6c8/0xf10 kernel/workqueue.c:3400
 kthread+0x3c5/0x780 kernel/kthread.c:463
 ret_from_fork+0x5d7/0x6f0 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>