------------[ cut here ]------------
refcount_t: underflow; use-after-free.
WARNING: lib/refcount.c:28 at refcount_warn_saturate+0x11a/0x1d0 lib/refcount.c:28, CPU#0: kworker/0:2/939
Modules linked in:
CPU: 0 UID: 0 PID: 939 Comm: kworker/0:2 Not tainted 6.16.0-next-20250731-syzkaller #0 PREEMPT(full) 
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 07/12/2025
Workqueue: md_misc mddev_delayed_delete
RIP: 0010:refcount_warn_saturate+0x11a/0x1d0 lib/refcount.c:28
Code: 40 49 04 8c e8 17 f7 b3 fc 90 0f 0b 90 90 eb d7 e8 1b 60 f0 fc c6 05 8d a8 fd 0a 01 90 48 c7 c7 a0 49 04 8c e8 f7 f6 b3 fc 90 <0f> 0b 90 90 eb b7 e8 fb 5f f0 fc c6 05 6a a8 fd 0a 01 90 48 c7 c7
RSP: 0018:ffffc90003a3fa68 EFLAGS: 00010246
RAX: 708d252635dcc200 RBX: 0000000000000003 RCX: ffff8880257cbc00
RDX: 0000000000000000 RSI: 0000000000000001 RDI: 0000000000000002
RBP: ffffc90003a3fc70 R08: 0000000000000003 R09: 0000000000000004
R10: dffffc0000000000 R11: fffffbfff1c7a1ec R12: ffff8880b86396c0
R13: ffff888025767118 R14: ffff8880603c2130 R15: 0000000000000000
FS:  0000000000000000(0000) GS:ffff88812580a000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007f9d35e58d58 CR3: 000000007a656000 CR4: 00000000003526f0
DR0: 0000000000000000 DR1: 000000000000000a DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000ffff0ff0 DR7: 0000000000000400
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3236 [inline]
 process_scheduled_works+0xade/0x17b0 kernel/workqueue.c:3319
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3400
 kthread+0x70e/0x8a0 kernel/kthread.c:463
 ret_from_fork+0x3fc/0x770 arch/x86/kernel/process.c:148
 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:245
 </TASK>