usb 2-1: USB disconnect, device number 20
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WARNING: CPU: 1 PID: 23 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: 23 Comm: kworker/1:0 Not tainted 6.16.0-rc4-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 r4:82259ba0
[<80201ae4>] (show_stack) from [<8021fdd8>] (__dump_stack lib/dump_stack.c:94 [inline])
[<80201ae4>] (show_stack) from [<8021fdd8>] (dump_stack_lvl+0x54/0x7c lib/dump_stack.c:120)
[<8021fd84>] (dump_stack_lvl) from [<8021fe18>] (dump_stack+0x18/0x1c lib/dump_stack.c:129)
 r5:00000000 r4:82a6dd18
[<8021fe00>] (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 r1:822406cc r0:8224807c
 r7:808c0ab4
[<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 r7:822b1bc4 r6:df879bfc r5:8324a400 r4:00000000
[<80258828>] (warn_slowpath_fmt) from [<808c0ab4>] (refcount_warn_saturate+0x13c/0x174 lib/refcount.c:28)
 r10:00000001 r9:829ca368 r8:8578d488 r7:8578fc74 r6:84ad9fb4 r5:8578fc00
 r4:85336400
[<808c0978>] (refcount_warn_saturate) from [<819fe868>] (__refcount_sub_and_test include/linux/refcount.h:400 [inline])
[<808c0978>] (refcount_warn_saturate) from [<819fe868>] (__refcount_dec_and_test include/linux/refcount.h:432 [inline])
[<808c0978>] (refcount_warn_saturate) from [<819fe868>] (refcount_dec_and_test include/linux/refcount.h:450 [inline])
[<808c0978>] (refcount_warn_saturate) from [<819fe868>] (kref_put include/linux/kref.h:64 [inline])
[<808c0978>] (refcount_warn_saturate) from [<819fe868>] (kobject_put+0x158/0x1f4 lib/kobject.c:737)
[<819fe710>] (kobject_put) from [<80b31208>] (put_device+0x18/0x1c drivers/base/core.c:3800)
 r7:8578fc74 r6:84ad9fb4 r5:8578fc00 r4:84ad9800
[<80b311f0>] (put_device) from [<8141a6bc>] (hdm_disconnect+0x90/0x9c drivers/most/most_usb.c:1129)
[<8141a62c>] (hdm_disconnect) from [<80e8d514>] (usb_unbind_interface+0x84/0x2b4 drivers/usb/core/driver.c:458)
 r7:8578fc74 r6:8578fc30 r5:00000000 r4:8578d400
[<80e8d490>] (usb_unbind_interface) from [<80b39290>] (device_remove drivers/base/dd.c:569 [inline])
[<80e8d490>] (usb_unbind_interface) from [<80b39290>] (device_remove+0x64/0x6c drivers/base/dd.c:561)
 r10:00000001 r9:8578d488 r8:00000044 r7:8578fc74 r6:829ca368 r5:00000000
 r4:8578fc30
[<80b3922c>] (device_remove) from [<80b3a780>] (__device_release_driver drivers/base/dd.c:1272 [inline])
[<80b3922c>] (device_remove) from [<80b3a780>] (device_release_driver_internal+0x18c/0x200 drivers/base/dd.c:1295)
 r5:00000000 r4:8578fc30
[<80b3a5f4>] (device_release_driver_internal) from [<80b3a80c>] (device_release_driver+0x18/0x1c drivers/base/dd.c:1318)
 r9:8578d488 r8:83354140 r7:83354138 r6:8335410c r5:8578fc30 r4:83354130
[<80b3a7f4>] (device_release_driver) from [<80b388e4>] (bus_remove_device+0xcc/0x120 drivers/base/bus.c:579)
[<80b38818>] (bus_remove_device) from [<80b32c40>] (device_del+0x148/0x38c drivers/base/core.c:3881)
 r9:8578d488 r8:8324a400 r7:04208060 r6:00000000 r5:8578fc30 r4:8578fc74
[<80b32af8>] (device_del) from [<80e8af64>] (usb_disable_device+0xd4/0x1e8 drivers/usb/core/message.c:1418)
 r10:00000001 r9:00000000 r8:00000000 r7:8578fc00 r6:8578d400 r5:8429bec8
 r4:60000113
[<80e8ae90>] (usb_disable_device) from [<80e7fce0>] (usb_disconnect+0xec/0x29c drivers/usb/core/hub.c:2316)
 r9:85337400 r8:8578d4cc r7:83f5f400 r6:8578d488 r5:8578d400 r4:60000113
[<80e7fbf4>] (usb_disconnect) from [<80e829a0>] (hub_port_connect drivers/usb/core/hub.c:5375 [inline])
[<80e7fbf4>] (usb_disconnect) from [<80e829a0>] (hub_port_connect_change drivers/usb/core/hub.c:5675 [inline])
[<80e7fbf4>] (usb_disconnect) from [<80e829a0>] (port_event drivers/usb/core/hub.c:5835 [inline])
[<80e7fbf4>] (usb_disconnect) from [<80e829a0>] (hub_event+0xe78/0x194c drivers/usb/core/hub.c:5917)
 r10:00000001 r9:00000100 r8:83c61700 r7:8578d400 r6:83f5ec00 r5:83f5f610
 r4:00000001
[<80e81b28>] (hub_event) from [<8027e2e8>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3238)
 r10:83354370 r9:83265e05 r8:8324a400 r7:ddde2d40 r6:83265e00 r5:83c61700
 r4:830cd080
[<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 r9:8324a400 r8:830cd0ac r7:82804d40 r6:ddde2d40 r5:ddde2d60
 r4:830cd080
[<8027ed34>] (worker_thread) from [<80285f5c>] (kthread+0x12c/0x280 kernel/kthread.c:464)
 r10:00000000 r9:830cd080 r8:8027ed34 r7:df819d50 r6:830cd100 r5:8324a400
 r4:00000001
[<80285e30>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdf879fb0 to 0xdf879ff8)
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 r5:80285e30
 r4:830cb100
Rebooting in 86400 seconds..