usb 2-1: USB disconnect, device number 16
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WARNING: CPU: 1 PID: 4467 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: 1 UID: 0 PID: 4467 Comm: kworker/1:25 Not tainted 6.16.0-rc7-syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: usb_hub_wq hub_event
Call trace: 
[<80201a00>] (dump_backtrace) from [<80201afc>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:8282083c r5:00000000 r4:8225b554
[<80201ae4>] (show_stack) from [<8021fdf4>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201ae4>] (show_stack) from [<8021fdf4>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021fda0>] (dump_stack_lvl) from [<8021fe34>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a6dd18
[<8021fe1c>] (dump_stack) from [<80202614>] (panic+0x120/0x374 kernel/panic.c:382)
[<802024f4>] (panic) from [<80258578>] (check_panic_on_warn kernel/panic.c:273 [inline])
[<802024f4>] (panic) from [<80258578>] (get_taint+0x0/0x1c kernel/panic.c:268)
 r3:8280c684 r2:00000001 r1:8224209c r0:82249a34
 r7:808b9934
[<80258504>] (check_panic_on_warn) from [<802586dc>] (__warn+0x80/0x188 kernel/panic.c:777)
[<8025865c>] (__warn) from [<802589cc>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:812)
 r8:00000009 r7:822b35d8 r6:dfc39bfc r5:84234800 r4:00000000
[<802587e8>] (warn_slowpath_fmt) from [<808b9934>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:00000100 r9:829caa68 r8:85a15488 r7:85a17874 r6:85570fb4 r5:85a17800
 r4:873bdc00
[<808b97f8>] (refcount_warn_saturate) from [<819fe3c8>] (__refcount_sub_and_test include/linux/refcount.h:400 [inline])
[<808b97f8>] (refcount_warn_saturate) from [<819fe3c8>] (__refcount_dec_and_test include/linux/refcount.h:432 [inline])
[<808b97f8>] (refcount_warn_saturate) from [<819fe3c8>] (refcount_dec_and_test include/linux/refcount.h:450 [inline])
[<808b97f8>] (refcount_warn_saturate) from [<819fe3c8>] (kref_put include/linux/kref.h:64 [inline])
[<808b97f8>] (refcount_warn_saturate) from [<819fe3c8>] (kobject_put+0x158/0x1f4 lib/kobject.c:737)
[<819fe270>] (kobject_put) from [<80b2a408>] (put_device+0x18/0x1c drivers/base/core.c:3800)
 r7:85a17874 r6:85570fb4 r5:85a17800 r4:85570800
[<80b2a3f0>] (put_device) from [<8141c95c>] (hdm_disconnect+0x90/0x9c drivers/most/most_usb.c:1129)
[<8141c8cc>] (hdm_disconnect) from [<80e86c5c>] (usb_unbind_interface+0x84/0x2b4 drivers/usb/core/driver.c:458)
 r7:85a17874 r6:85a17830 r5:00000000 r4:85a15400
[<80e86bd8>] (usb_unbind_interface) from [<80b32490>] (device_remove drivers/base/dd.c:569 [inline])
[<80e86bd8>] (usb_unbind_interface) from [<80b32490>] (device_remove+0x64/0x6c drivers/base/dd.c:561)
 r10:00000100 r9:85a15488 r8:00000044 r7:85a17874 r6:829caa68 r5:00000000
 r4:85a17830
[<80b3242c>] (device_remove) from [<80b33980>] (__device_release_driver drivers/base/dd.c:1272 [inline])
[<80b3242c>] (device_remove) from [<80b33980>] (device_release_driver_internal+0x18c/0x200 drivers/base/dd.c:1295)
 r5:00000000 r4:85a17830
[<80b337f4>] (device_release_driver_internal) from [<80b33a0c>] (device_release_driver+0x18/0x1c drivers/base/dd.c:1318)
 r9:85a15488 r8:8335eb40 r7:8335eb38 r6:8335eb0c r5:85a17830 r4:8335eb30
[<80b339f4>] (device_release_driver) from [<80b31ae4>] (bus_remove_device+0xcc/0x120 drivers/base/bus.c:579)
[<80b31a18>] (bus_remove_device) from [<80b2be40>] (device_del+0x148/0x38c drivers/base/core.c:3881)
 r9:85a15488 r8:84234800 r7:04208060 r6:00000000 r5:85a17830 r4:85a17874
[<80b2bcf8>] (device_del) from [<80e846ac>] (usb_disable_device+0xd4/0x1e8 drivers/usb/core/message.c:1418)
 r10:00000100 r9:00000000 r8:00000000 r7:85a17800 r6:85a15400 r5:85857948
 r4:60000013
[<80e845d8>] (usb_disable_device) from [<80e793bc>] (usb_disconnect+0xec/0x2ac drivers/usb/core/hub.c:2344)
 r9:873bda00 r8:85a154cc r7:83e97800 r6:85a15488 r5:85a15400 r4:60000013
[<80e792d0>] (usb_disconnect) from [<80e7c3b0>] (hub_port_connect drivers/usb/core/hub.c:5406 [inline])
[<80e792d0>] (usb_disconnect) from [<80e7c3b0>] (hub_port_connect_change drivers/usb/core/hub.c:5706 [inline])
[<80e792d0>] (usb_disconnect) from [<80e7c3b0>] (port_event drivers/usb/core/hub.c:5870 [inline])
[<80e792d0>] (usb_disconnect) from [<80e7c3b0>] (hub_event+0x1194/0x1950 drivers/usb/core/hub.c:5952)
 r10:00000100 r9:83e0d52c r8:83e97000 r7:85a15400 r6:83e0ce00 r5:00000001
 r4:00000001
[<80e7b21c>] (hub_event) from [<8027e2a8>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3238)
 r10:8335ed70 r9:8326f205 r8:84234800 r7:ddde2d40 r6:8326f200 r5:83e0d52c
 r4:858e9700
[<8027e0f4>] (process_one_work) from [<8027eef0>] (process_scheduled_works kernel/workqueue.c:3321 [inline])
[<8027e0f4>] (process_one_work) from [<8027eef0>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3402)
 r10:61c88647 r9:84234800 r8:858e972c r7:82804d40 r6:ddde2d40 r5:ddde2d60
 r4:858e9700
[<8027ecf4>] (worker_thread) from [<80285f1c>] (kthread+0x12c/0x280 kernel/kthread.c:464)
 r10:00000000 r9:858e9700 r8:8027ecf4 r7:dff15e60 r6:858f2600 r5:84234800
 r4:00000001
[<80285df0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfc39fb0 to 0xdfc39ff8)
9fa0:                                     00000000 00000000 00000000 00000000
9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
9fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80285df0
 r4:857cbf40
Rebooting in 86400 seconds..