------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 5881 at lib/refcount.c:28 refcount_warn_saturate+0x11a/0x1d0
Modules linked in:
CPU: 1 UID: 0 PID: 5881 Comm: kworker/1:4 Not tainted 6.16.0-syzkaller-08685-g260f6f4fda93 #0 PREEMPT(full) 
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.2-debian-1.16.2-1 04/01/2014
Workqueue: md_misc mddev_delayed_delete
RIP: 0010:refcount_warn_saturate+0x11a/0x1d0
Code: e0 77 e2 8b e8 97 65 be fc 90 0f 0b 90 90 eb d7 e8 3b be fa fc c6 05 01 a5 c5 0a 01 90 48 c7 c7 40 78 e2 8b e8 77 65 be fc 90 <0f> 0b 90 90 eb b7 e8 1b be fa fc c6 05 de a4 c5 0a 01 90 48 c7 c7
RSP: 0018:ffffc9000424fa68 EFLAGS: 00010246
RAX: 412de7236ce7d400 RBX: 0000000000000003 RCX: ffff88810819d640
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc9000424fc70 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1bfa1d4 R12: ffff8881366396c0
R13: ffff888106edd418 R14: ffff8880376e6130 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff8881a3c79000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000000007 CR3: 000000010f056000 CR4: 00000000000006f0
Call Trace:
 <TASK>
 process_scheduled_works+0xae1/0x17b0
 worker_thread+0x8a0/0xda0
 kthread+0x711/0x8a0
 ret_from_fork+0x3fc/0x770
 ret_from_fork_asm+0x1a/0x30
 </TASK>
