usb 1-1: USB disconnect, device number 2
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WARNING: CPU: 1 PID: 5058 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: 5058 Comm: kworker/1:9 Not tainted 6.16.0-rc5-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 r4:8225c0c4
[<80201ae4>] (show_stack) from [<8021fd6c>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201ae4>] (show_stack) from [<8021fd6c>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021fd18>] (dump_stack_lvl) from [<8021fdac>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a6dd18
[<8021fd94>] (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 r1:82242c0c r0:8224a5a4
 r7:808bfc34
[<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 r7:822b42a0 r6:dfa81bfc r5:84ac5400 r4:00000000
[<802587e8>] (warn_slowpath_fmt) from [<808bfc34>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:00000001 r9:829ca928 r8:85554c88 r7:85555074 r6:84d447b4 r5:85555000
 r4:84d44000
[<808bfaf8>] (refcount_warn_saturate) from [<81a064e8>] (__refcount_sub_and_test include/linux/refcount.h:400 [inline])
[<808bfaf8>] (refcount_warn_saturate) from [<81a064e8>] (__refcount_dec_and_test include/linux/refcount.h:432 [inline])
[<808bfaf8>] (refcount_warn_saturate) from [<81a064e8>] (refcount_dec_and_test include/linux/refcount.h:450 [inline])
[<808bfaf8>] (refcount_warn_saturate) from [<81a064e8>] (kref_put include/linux/kref.h:64 [inline])
[<808bfaf8>] (refcount_warn_saturate) from [<81a064e8>] (kobject_put+0x158/0x1f4 lib/kobject.c:737)
[<81a06390>] (kobject_put) from [<80b30370>] (put_device+0x18/0x1c drivers/base/core.c:3800)
 r7:85555074 r6:84d447b4 r5:85555000 r4:84d44000
[<80b30358>] (put_device) from [<814223d4>] (hdm_disconnect+0x98/0x9c drivers/most/most_usb.c:1130)
[<8142233c>] (hdm_disconnect) from [<80e8c948>] (usb_unbind_interface+0x84/0x2b4 drivers/usb/core/driver.c:458)
 r7:85555074 r6:85555030 r5:00000000 r4:85554c00
[<80e8c8c4>] (usb_unbind_interface) from [<80b383f8>] (device_remove drivers/base/dd.c:569 [inline])
[<80e8c8c4>] (usb_unbind_interface) from [<80b383f8>] (device_remove+0x64/0x6c drivers/base/dd.c:561)
 r10:00000001 r9:85554c88 r8:00000044 r7:85555074 r6:829ca928 r5:00000000
 r4:85555030
[<80b38394>] (device_remove) from [<80b398e8>] (__device_release_driver drivers/base/dd.c:1272 [inline])
[<80b38394>] (device_remove) from [<80b398e8>] (device_release_driver_internal+0x18c/0x200 drivers/base/dd.c:1295)
 r5:00000000 r4:85555030
[<80b3975c>] (device_release_driver_internal) from [<80b39974>] (device_release_driver+0x18/0x1c drivers/base/dd.c:1318)
 r9:85554c88 r8:8335cc40 r7:8335cc38 r6:8335cc0c r5:85555030 r4:8335cc30
[<80b3995c>] (device_release_driver) from [<80b37a4c>] (bus_remove_device+0xcc/0x120 drivers/base/bus.c:579)
[<80b37980>] (bus_remove_device) from [<80b31da8>] (device_del+0x148/0x38c drivers/base/core.c:3881)
 r9:85554c88 r8:84ac5400 r7:04208060 r6:00000000 r5:85555030 r4:85555074
[<80b31c60>] (device_del) from [<80e8a398>] (usb_disable_device+0xd4/0x1e8 drivers/usb/core/message.c:1418)
 r10:00000001 r9:00000000 r8:00000000 r7:85555000 r6:85554c00 r5:84913b88
 r4:00000001
[<80e8a2c4>] (usb_disable_device) from [<80e7f0ac>] (usb_disconnect+0xec/0x2ac drivers/usb/core/hub.c:2344)
 r9:855ef600 r8:85554ccc r7:840b4c00 r6:85554c88 r5:85554c00 r4:60000013
[<80e7efc0>] (usb_disconnect) from [<80e81d84>] (hub_port_connect drivers/usb/core/hub.c:5406 [inline])
[<80e7efc0>] (usb_disconnect) from [<80e81d84>] (hub_port_connect_change drivers/usb/core/hub.c:5706 [inline])
[<80e7efc0>] (usb_disconnect) from [<80e81d84>] (port_event drivers/usb/core/hub.c:5866 [inline])
[<80e7efc0>] (usb_disconnect) from [<80e81d84>] (hub_event+0xe78/0x194c drivers/usb/core/hub.c:5948)
 r10:00000001 r9:00000100 r8:83d41b2c r7:85554c00 r6:840b4400 r5:840b4e10
 r4:00000001
[<80e80f0c>] (hub_event) from [<8027e2a8>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3238)
 r10:8335ce70 r9:8326f605 r8:84ac5400 r7:ddde2d40 r6:8326f600 r5:83d41b2c
 r4:84a4d200
[<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 r9:84ac5400 r8:84a4d22c r7:82804d40 r6:ddde2d40 r5:ddde2d60
 r4:84a4d200
[<8027ecf4>] (worker_thread) from [<80285f1c>] (kthread+0x12c/0x280 kernel/kthread.c:464)
 r10:00000000 r9:84a4d200 r8:8027ecf4 r7:dfc15e60 r6:84932100 r5:84ac5400
 r4:00000001
[<80285df0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfa81fb0 to 0xdfa81ff8)
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 r5:80285df0
 r4:854d6340
Rebooting in 86400 seconds..