------------[ cut here ]------------
WARNING: CPU: 0 PID: 10023 at lib/refcount.c:28 refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28
refcount_t: underflow; use-after-free.
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 UID: 0 PID: 10023 Comm: kworker/0:1 Not tainted 6.16.0-syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: md_misc mddev_delayed_delete
Call trace: 
[<80201a20>] (dump_backtrace) from [<80201b1c>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:8281fa3c r5:00000000 r4:82249da0
[<80201b04>] (show_stack) from [<8021fd7c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b04>] (show_stack) from [<8021fd7c>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021fd28>] (dump_stack_lvl) from [<8021fdbc>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a6cd18
[<8021fda4>] (dump_stack) from [<80202634>] (panic+0x120/0x374 kernel/panic.c:382)
[<80202514>] (panic) from [<80254700>] (check_panic_on_warn kernel/panic.c:273 [inline])
[<80202514>] (panic) from [<80254700>] (get_taint+0x0/0x1c kernel/panic.c:268)
 r3:8280c684 r2:00000001 r1:822308dc r0:82238284
 r7:808af8a4
[<8025468c>] (check_panic_on_warn) from [<80254864>] (__warn+0x80/0x188 kernel/panic.c:777)
[<802547e4>] (__warn) from [<80254b54>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:812)
 r8:00000009 r7:822a1ecc r6:dfb61e54 r5:85910c00 r4:00000000
[<80254970>] (warn_slowpath_fmt) from [<808af8a4>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:833aa070 r9:83272225 r8:85910c00 r7:dddced40 r6:83272200 r5:8692621c
 r4:86926050
[<808af768>] (refcount_warn_saturate) from [<819ef368>] (__refcount_sub_and_test include/linux/refcount.h:400 [inline])
[<808af768>] (refcount_warn_saturate) from [<819ef368>] (__refcount_dec_and_test include/linux/refcount.h:432 [inline])
[<808af768>] (refcount_warn_saturate) from [<819ef368>] (refcount_dec_and_test include/linux/refcount.h:450 [inline])
[<808af768>] (refcount_warn_saturate) from [<819ef368>] (kref_put include/linux/kref.h:64 [inline])
[<808af768>] (refcount_warn_saturate) from [<819ef368>] (kobject_put+0x158/0x1f4 lib/kobject.c:737)
[<819ef210>] (kobject_put) from [<81155f88>] (mddev_delayed_delete+0x14/0x18 drivers/md/md.c:5893)
 r7:dddced40 r6:83272200 r5:8692621c r4:85bcb580
[<81155f74>] (mddev_delayed_delete) from [<8027a440>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3238)
[<8027a28c>] (process_one_work) from [<8027b088>] (process_scheduled_works kernel/workqueue.c:3321 [inline])
[<8027a28c>] (process_one_work) from [<8027b088>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3402)
 r10:61c88647 r9:85910c00 r8:85bcb5ac r7:82804d40 r6:dddced40 r5:dddced60
 r4:85bcb580
[<8027ae8c>] (worker_thread) from [<80282070>] (kthread+0x12c/0x280 kernel/kthread.c:464)
 r10:00000000 r9:85bcb580 r8:8027ae8c r7:df9d9e60 r6:85bcb000 r5:85910c00
 r4:00000001
[<80281f44>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfb61fb0 to 0xdfb61ff8)
1fa0:                                     00000000 00000000 00000000 00000000
1fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
1fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80281f44
 r4:85a25ac0
Rebooting in 86400 seconds..