usb 2-1: Manufacturer: syz
usb 2-1: SerialNumber: syz
usb 2-1: USB disconnect, device number 9
------------[ cut here ]------------
WARNING: CPU: 0 PID: 1785 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: 1785 Comm: kworker/0:3 Not tainted 6.16.0-rc3-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 r4:822599f8
[<80201ae4>] (show_stack) from [<8021fdd4>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201ae4>] (show_stack) from [<8021fdd4>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021fd80>] (dump_stack_lvl) from [<8021fe14>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a6cd18
[<8021fdfc>] (dump_stack) from [<80202614>] (panic+0x120/0x374 kernel/panic.c:382)
[<802024f4>] (panic) from [<802585b8>] (check_panic_on_warn kernel/panic.c:273 [inline])
[<802024f4>] (panic) from [<802585b8>] (get_taint+0x0/0x1c kernel/panic.c:268)
 r3:8280c684 r2:00000001 r1:82240524 r0:82247ed4
 r7:808c08f4
[<80258544>] (check_panic_on_warn) from [<8025871c>] (__warn+0x80/0x188 kernel/panic.c:777)
[<8025869c>] (__warn) from [<80258a0c>] (warn_slowpath_fmt+0x1e8/0x1f4 kernel/panic.c:812)
 r8:00000009 r7:822b1a1c r6:eaf55bfc r5:83838c00 r4:00000000
[<80258828>] (warn_slowpath_fmt) from [<808c08f4>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:00000001 r9:829ca328 r8:85676088 r7:85675074 r6:852e4fb4 r5:85675000
 r4:85761000
[<808c07b8>] (refcount_warn_saturate) from [<819fe468>] (__refcount_sub_and_test include/linux/refcount.h:400 [inline])
[<808c07b8>] (refcount_warn_saturate) from [<819fe468>] (__refcount_dec_and_test include/linux/refcount.h:432 [inline])
[<808c07b8>] (refcount_warn_saturate) from [<819fe468>] (refcount_dec_and_test include/linux/refcount.h:450 [inline])
[<808c07b8>] (refcount_warn_saturate) from [<819fe468>] (kref_put include/linux/kref.h:64 [inline])
[<808c07b8>] (refcount_warn_saturate) from [<819fe468>] (kobject_put+0x158/0x1f4 lib/kobject.c:737)
[<819fe310>] (kobject_put) from [<80b30fd0>] (put_device+0x18/0x1c drivers/base/core.c:3800)
 r7:85675074 r6:852e4fb4 r5:85675000 r4:852e4800
[<80b30fb8>] (put_device) from [<8141a3e4>] (hdm_disconnect+0x90/0x9c drivers/most/most_usb.c:1129)
[<8141a354>] (hdm_disconnect) from [<80e8d354>] (usb_unbind_interface+0x84/0x2b4 drivers/usb/core/driver.c:458)
 r7:85675074 r6:85675030 r5:00000000 r4:85676000
[<80e8d2d0>] (usb_unbind_interface) from [<80b39058>] (device_remove drivers/base/dd.c:569 [inline])
[<80e8d2d0>] (usb_unbind_interface) from [<80b39058>] (device_remove+0x64/0x6c drivers/base/dd.c:561)
 r10:00000001 r9:85676088 r8:00000044 r7:85675074 r6:829ca328 r5:00000000
 r4:85675030
[<80b38ff4>] (device_remove) from [<80b3a548>] (__device_release_driver drivers/base/dd.c:1272 [inline])
[<80b38ff4>] (device_remove) from [<80b3a548>] (device_release_driver_internal+0x18c/0x200 drivers/base/dd.c:1295)
 r5:00000000 r4:85675030
[<80b3a3bc>] (device_release_driver_internal) from [<80b3a5d4>] (device_release_driver+0x18/0x1c drivers/base/dd.c:1318)
 r9:85676088 r8:8335cc40 r7:8335cc38 r6:8335cc0c r5:85675030 r4:8335cc30
[<80b3a5bc>] (device_release_driver) from [<80b386ac>] (bus_remove_device+0xcc/0x120 drivers/base/bus.c:579)
[<80b385e0>] (bus_remove_device) from [<80b32a08>] (device_del+0x148/0x38c drivers/base/core.c:3881)
 r9:85676088 r8:83838c00 r7:04208060 r6:00000000 r5:85675030 r4:85675074
[<80b328c0>] (device_del) from [<80e8ada4>] (usb_disable_device+0xd4/0x1e8 drivers/usb/core/message.c:1418)
 r10:00000001 r9:00000000 r8:00000000 r7:85675000 r6:85676000 r5:84811c48
 r4:00000002
[<80e8acd0>] (usb_disable_device) from [<80e7fb20>] (usb_disconnect+0xec/0x29c drivers/usb/core/hub.c:2316)
 r9:85760200 r8:856760cc r7:83d9e000 r6:85676088 r5:85676000 r4:60000113
[<80e7fa34>] (usb_disconnect) from [<80e827e0>] (hub_port_connect drivers/usb/core/hub.c:5375 [inline])
[<80e7fa34>] (usb_disconnect) from [<80e827e0>] (hub_port_connect_change drivers/usb/core/hub.c:5675 [inline])
[<80e7fa34>] (usb_disconnect) from [<80e827e0>] (port_event drivers/usb/core/hub.c:5835 [inline])
[<80e7fa34>] (usb_disconnect) from [<80e827e0>] (hub_event+0xe78/0x194c drivers/usb/core/hub.c:5917)
 r10:00000001 r9:00000100 r8:83dbff00 r7:85676000 r6:83d9d800 r5:83d9e210
 r4:00000001
[<80e81968>] (hub_event) from [<8027e2e8>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3238)
 r10:8335ce70 r9:8326f405 r8:83838c00 r7:dddced40 r6:8326f400 r5:83dbff00
 r4:8423fe00
[<8027e134>] (process_one_work) from [<8027ef30>] (process_scheduled_works kernel/workqueue.c:3321 [inline])
[<8027e134>] (process_one_work) from [<8027ef30>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3402)
 r10:61c88647 r9:83838c00 r8:8423fe2c r7:82804d40 r6:dddced40 r5:dddced60
 r4:8423fe00
[<8027ed34>] (worker_thread) from [<80285f5c>] (kthread+0x12c/0x280 kernel/kthread.c:464)
 r10:00000000 r9:8423fe00 r8:8027ed34 r7:df849e60 r6:8423fe80 r5:83838c00
 r4:00000001
[<80285e30>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xeaf55fb0 to 0xeaf55ff8)
5fa0:                                     00000000 00000000 00000000 00000000
5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000
5fe0: 00000000 00000000 00000000 00000000 00000013 00000000
 r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:80285e30
 r4:84241e80
Rebooting in 86400 seconds..