usb 2-1: Manufacturer: syz
usb 2-1: SerialNumber: syz
usb 2-1: USB disconnect, device number 2
------------[ cut here ]------------
WARNING: CPU: 0 PID: 5253 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: 5253 Comm: kworker/0:5 Not tainted 6.17.0-rc1-syzkaller #0 PREEMPT 
Hardware name: ARM-Versatile Express
Workqueue: usb_hub_wq hub_event
Call trace: 
[<80201a24>] (dump_backtrace) from [<80201b20>] (show_stack+0x18/0x1c arch/arm/kernel/traps.c:257)
 r7:00000000 r6:8281f77c r5:00000000 r4:822602a4
[<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)
 r7:808bb408
[<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 r1:82246cb4 r0:8224e730
[<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 r7:822b8d84 r6:e03d1bfc r5:85694800 r4:00000000
[<80254bd0>] (warn_slowpath_fmt) from [<808bb408>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:00000100 r9:829d55bc r8:8501a888 r7:85018074 r6:853e7fb4 r5:85018000
 r4:856cae00
[<808bb2cc>] (refcount_warn_saturate) from [<81a11ca8>] (__refcount_sub_and_test include/linux/refcount.h:400 [inline])
[<808bb2cc>] (refcount_warn_saturate) from [<81a11ca8>] (__refcount_dec_and_test include/linux/refcount.h:432 [inline])
[<808bb2cc>] (refcount_warn_saturate) from [<81a11ca8>] (refcount_dec_and_test include/linux/refcount.h:450 [inline])
[<808bb2cc>] (refcount_warn_saturate) from [<81a11ca8>] (kref_put include/linux/kref.h:64 [inline])
[<808bb2cc>] (refcount_warn_saturate) from [<81a11ca8>] (kobject_put+0x158/0x1f4 lib/kobject.c:737)
[<81a11b50>] (kobject_put) from [<80b3cf80>] (put_device+0x18/0x1c drivers/base/core.c:3797)
 r7:85018074 r6:853e7fb4 r5:85018000 r4:853e7800
[<80b3cf68>] (put_device) from [<814356e8>] (hdm_disconnect+0x90/0x9c drivers/most/most_usb.c:1129)
[<81435658>] (hdm_disconnect) from [<80e9c02c>] (usb_unbind_interface+0x84/0x2bc drivers/usb/core/driver.c:458)
 r7:85018074 r6:85018030 r5:00000000 r4:8501a800
[<80e9bfa8>] (usb_unbind_interface) from [<80b450f8>] (device_remove drivers/base/dd.c:571 [inline])
[<80e9bfa8>] (usb_unbind_interface) from [<80b450f8>] (device_remove+0x64/0x6c drivers/base/dd.c:563)
 r10:00000100 r9:8501a888 r8:00000044 r7:85018074 r6:829d55bc r5:00000000
 r4:85018030
[<80b45094>] (device_remove) from [<80b465e8>] (__device_release_driver drivers/base/dd.c:1274 [inline])
[<80b45094>] (device_remove) from [<80b465e8>] (device_release_driver_internal+0x18c/0x200 drivers/base/dd.c:1297)
 r5:00000000 r4:85018030
[<80b4645c>] (device_release_driver_internal) from [<80b46674>] (device_release_driver+0x18/0x1c drivers/base/dd.c:1320)
 r9:8501a888 r8:8335cd40 r7:8335cd38 r6:8335cd0c r5:85018030 r4:8335cd30
[<80b4665c>] (device_release_driver) from [<80b4473c>] (bus_remove_device+0xcc/0x120 drivers/base/bus.c:579)
[<80b44670>] (bus_remove_device) from [<80b3e9d4>] (device_del+0x148/0x38c drivers/base/core.c:3878)
 r9:8501a888 r8:85694800 r7:04208060 r6:00000000 r5:85018030 r4:85018074
[<80b3e88c>] (device_del) from [<80e99a68>] (usb_disable_device+0xd4/0x1e8 drivers/usb/core/message.c:1418)
 r10:00000100 r9:00000000 r8:00000000 r7:85018000 r6:8501a800 r5:8578ae08
 r4:60000113
[<80e99994>] (usb_disable_device) from [<80e8e830>] (usb_disconnect+0xec/0x2ac drivers/usb/core/hub.c:2344)
 r9:856cb000 r8:8501a8cc r7:83cb7c00 r6:8501a888 r5:8501a800 r4:60000113
[<80e8e744>] (usb_disconnect) from [<80e9182c>] (hub_port_connect drivers/usb/core/hub.c:5406 [inline])
[<80e8e744>] (usb_disconnect) from [<80e9182c>] (hub_port_connect_change drivers/usb/core/hub.c:5706 [inline])
[<80e8e744>] (usb_disconnect) from [<80e9182c>] (port_event drivers/usb/core/hub.c:5870 [inline])
[<80e8e744>] (usb_disconnect) from [<80e9182c>] (hub_event+0x1194/0x1950 drivers/usb/core/hub.c:5952)
 r10:00000100 r9:83e3632c r8:83cb7400 r7:8501a800 r6:83e31c00 r5:00000001
 r4:00000001
[<80e90698>] (hub_event) from [<8027a3bc>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3236)
 r10:8335cf70 r9:8326fe05 r8:85694800 r7:dddced40 r6:8326fe00 r5:83e3632c
 r4:851e1980
[<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 r9:85694800 r8:851e19ac r7:82804d40 r6:dddced40 r5:dddced60
 r4:851e1980
[<8027ae08>] (worker_thread) from [<80281fec>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:851e1980 r8:8027ae08 r7:eb675e60 r6:8505e180 r5:85694800
 r4:00000001
[<80281ec0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xe03d1fb0 to 0xe03d1ff8)
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
 r4:8578a580
Rebooting in 86400 seconds..