------------[ cut here ]------------
WARNING: CPU: 0 PID: 20462 at lib/refcount.c:28 refco
WARNING: CPU: 0 PID: 20462 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: 20462 Comm: kworker/0:84 Not tainted 6.16.0-syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: md_misc mddev_delayed_delete
Call trace: 
[<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:8281f77c r5:00000000 r4:8225ff64
[<80201b08>] (show_stack) from [<8021fb74>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201b08>] (show_stack) from [<8021fb74>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021fb20>] (dump_stack_lvl) from [<8021fbb4>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a77d18
[<8021fb9c>] (dump_stack) from [<80202624>] (vpanic+0x10c/0x30c kernel/panic.c:430)
[<80202518>] (vpanic) from [<80202858>] (trace_suspend_resume+0x0/0xd8 kernel/panic.c:566)
 r7:808bae18
[<80202824>] (panic) from [<80254960>] (check_panic_on_warn kernel/panic.c:323 [inline])
[<80202824>] (panic) from [<80254960>] (get_taint+0x0/0x1c kernel/panic.c:318)
 r3:8280c684 r2:00000001 r1:82246978 r0:8224e3f4
[<802548e8>] (check_panic_on_warn) from [<80254ac4>] (__warn+0x80/0x188 kernel/panic.c:837)
[<80254a44>] (__warn) from [<80254db4>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:872)
 r8:00000009 r7:822b8a08 r6:e0361e54 r5:8557bc00 r4:00000000
[<80254bd0>] (warn_slowpath_fmt) from [<808bae18>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:833da270 r9:83274665 r8:8557bc00 r7:dddced40 r6:83274600 r5:85d7ea1c
 r4:85d7e850
[<808bacdc>] (refcount_warn_saturate) from [<81a10d48>] (__refcount_sub_and_test include/linux/refcount.h:400 [inline])
[<808bacdc>] (refcount_warn_saturate) from [<81a10d48>] (__refcount_dec_and_test include/linux/refcount.h:432 [inline])
[<808bacdc>] (refcount_warn_saturate) from [<81a10d48>] (refcount_dec_and_test include/linux/refcount.h:450 [inline])
[<808bacdc>] (refcount_warn_saturate) from [<81a10d48>] (kref_put include/linux/kref.h:64 [inline])
[<808bacdc>] (refcount_warn_saturate) from [<81a10d48>] (kobject_put+0x158/0x1f4 lib/kobject.c:737)
[<81a10bf0>] (kobject_put) from [<81169198>] (mddev_delayed_delete+0x14/0x18 drivers/md/md.c:5893)
 r7:dddced40 r6:83274600 r5:85d7ea1c r4:8644ca80
[<81169184>] (mddev_delayed_delete) from [<8027a3bc>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3236)
[<8027a208>] (process_one_work) from [<8027b004>] (process_scheduled_works kernel/workqueue.c:3319 [inline])
[<8027a208>] (process_one_work) from [<8027b004>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3400)
 r10:61c88647 r9:8557bc00 r8:8644caac r7:82804d40 r6:dddced40 r5:dddced60
 r4:8644ca80
[<8027ae08>] (worker_thread) from [<80281fec>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:8644ca80 r8:8027ae08 r7:e0325e60 r6:85e0e300 r5:8557bc00
 r4:00000001
[<80281ec0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xe0361fb0 to 0xe0361ff8)
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 r5:80281ec0
 r4:856f7fc0
Rebooting in 86400 seconds..