syzbot

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refcount_t: underflow; use-after-free.
WARNING: CPU: 1 PID: 24 at lib/refcount.c:28 refcount_warn_saturate+0x11a/0x1d0 lib/refcount.c:28
Modules linked in:
CPU: 1 UID: 0 PID: 24 Comm: kworker/1:0 Not tainted 6.16.0-syzkaller-00857-gced1b9e0392d #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: 00 83 e2 8b e8 b7 5b bf fc 90 0f 0b 90 90 eb d7 e8 bb 6d fb fc c6 05 09 32 c7 0a 01 90 48 c7 c7 60 83 e2 8b e8 97 5b bf fc 90 <0f> 0b 90 90 eb b7 e8 9b 6d fb fc c6 05 e6 31 c7 0a 01 90 48 c7 c7
RSP: 0018:ffffc900001e7a68 EFLAGS: 00010246
RAX: 4efff925454ad500 RBX: 0000000000000003 RCX: ffff88801d2b8000
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000002
RBP: ffffc900001e7c70 R08: ffff8880b8724293 R09: 1ffff110170e4852
R10: dffffc0000000000 R11: ffffed10170e4853 R12: ffff8880b8739700
R13: ffff88801ce88e18 R14: ffff8880340f6130 R15: 0000000000000001
FS:  0000000000000000(0000) GS:ffff888125d07000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fe95c20b278 CR3: 000000000df38000 CR4: 0000000000350ef0
Call Trace:
 <TASK>
 process_one_work kernel/workqueue.c:3238 [inline]
 process_scheduled_works+0xae1/0x17b0 kernel/workqueue.c:3321
 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3402
 kthread+0x711/0x8a0 kernel/kthread.c:464
 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>