dm9601 1-1:0.0 eth5: register 'dm9601' at usb-dummy_hcd.0-1, Davicom DM96xx USB 10/100 Ethernet, 6e:00:00:00:00:00
usb 1-1: USB disconnect, device number 7
dm9601 1-1:0.0 eth5: unregister 'dm9601' usb-dummy_hcd.0-1, Davicom DM96xx USB 10/100 Ethernet
------------[ cut here ]------------
WARNING: CPU: 0 PID: 3815 at lib/debugobjects.c:612 de
WARNING: CPU: 0 PID: 3815 at lib/debugobjects.c:612 debug_print_object+0xc4/0xd8 lib/debugobjects.c:612
ODEBUG: free active (active state 0) object: 84b1a804 object type: work_struct hint: usbnet_deferred_kevent+0x0/0x38c drivers/net/usb/usbnet.c:1862
Modules linked in:
Kernel panic - not syncing: kernel: panic_on_warn set ...
CPU: 0 UID: 0 PID: 3815 Comm: kworker/0:4 Not tainted 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 r4:82260500
[<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)
 r7:808dc5c4
[<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 r1:82246f1c r0:8224e998
[<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 r7:822b9990 r6:dfdd5a84 r5:83a20000 r4:00000000
[<80254bd0>] (warn_slowpath_fmt) from [<808dc5c4>] (debug_print_object+0xc4/0xd8 lib/debugobjects.c:612)
 r10:00000005 r9:84b1a000 r8:81c01e68 r7:822e4f64 r6:82ae3d64 r5:dfdd5b2c
 r4:8280ccb8
[<808dc500>] (debug_print_object) from [<808de028>] (__debug_check_no_obj_freed lib/debugobjects.c:1099 [inline])
[<808dc500>] (debug_print_object) from [<808de028>] (debug_check_no_obj_freed+0x25c/0x2a4 lib/debugobjects.c:1129)
 r8:84b1b000 r7:84b1a804 r6:00000100 r5:00000003 r4:00000000
[<808dddcc>] (debug_check_no_obj_freed) from [<804ff38c>] (slab_free_hook mm/slub.c:2348 [inline])
[<808dddcc>] (debug_check_no_obj_freed) from [<804ff38c>] (slab_free mm/slub.c:4680 [inline])
[<808dddcc>] (debug_check_no_obj_freed) from [<804ff38c>] (kfree+0x190/0x394 mm/slub.c:4879)
 r10:00000100 r9:8297e2a0 r8:84b1a000 r7:80500218 r6:83002480 r5:ddea1f60
 r4:84b1a000
[<804ff1fc>] (kfree) from [<80500218>] (kvfree+0x2c/0x30 mm/slub.c:5095)
 r10:00000100 r9:8297e2a0 r8:84b1a000 r7:00000000 r6:85a4d080 r5:859fd300
 r4:84b1a000
[<805001ec>] (kvfree) from [<815c25c8>] (netdev_release+0x2c/0x34 net/core/net-sysfs.c:2250)
 r5:859fd300 r4:84b1a000
[<815c259c>] (netdev_release) from [<80b3d0e0>] (device_release+0x38/0xa8 drivers/base/core.c:2565)
 r5:859fd300 r4:84b1a3a0
[<80b3d0a8>] (device_release) from [<81a130f0>] (kobject_cleanup lib/kobject.c:689 [inline])
[<80b3d0a8>] (device_release) from [<81a130f0>] (kobject_release lib/kobject.c:720 [inline])
[<80b3d0a8>] (device_release) from [<81a130f0>] (kref_put include/linux/kref.h:65 [inline])
[<80b3d0a8>] (device_release) from [<81a130f0>] (kobject_put+0xa0/0x1f4 lib/kobject.c:737)
 r5:81d4ebec r4:84b1a3a0
[<81a13050>] (kobject_put) from [<80b3d32c>] (put_device+0x18/0x1c drivers/base/core.c:3797)
 r7:000000c0 r6:00000000 r5:00000000 r4:84b1a000
[<80b3d314>] (put_device) from [<81572c48>] (free_netdev+0x190/0x248 net/core/dev.c:12002)
[<81572ab8>] (free_netdev) from [<80e32028>] (usbnet_disconnect+0xb8/0xfc drivers/net/usb/usbnet.c:1673)
 r7:859aa800 r6:84b1a7d4 r5:84b1a6c0 r4:00000000
[<80e31f70>] (usbnet_disconnect) from [<80e9c804>] (usb_unbind_interface+0x84/0x2bc drivers/usb/core/driver.c:458)
 r8:859ab088 r7:859aa874 r6:859aa830 r5:00000000 r4:859ab000
[<80e9c780>] (usb_unbind_interface) from [<80b454a8>] (device_remove drivers/base/dd.c:571 [inline])
[<80e9c780>] (usb_unbind_interface) from [<80b454a8>] (device_remove+0x64/0x6c drivers/base/dd.c:563)
 r10:00000100 r9:859ab088 r8:00000044 r7:859aa874 r6:8297e2a0 r5:00000000
 r4:859aa830
[<80b45444>] (device_remove) from [<80b46998>] (__device_release_driver drivers/base/dd.c:1274 [inline])
[<80b45444>] (device_remove) from [<80b46998>] (device_release_driver_internal+0x18c/0x200 drivers/base/dd.c:1297)
 r5:00000000 r4:859aa830
[<80b4680c>] (device_release_driver_internal) from [<80b46a24>] (device_release_driver+0x18/0x1c drivers/base/dd.c:1320)
 r9:859ab088 r8:832b4640 r7:832b4638 r6:832b460c r5:859aa830 r4:832b4630
[<80b46a0c>] (device_release_driver) from [<80b44ae8>] (bus_remove_device+0xcc/0x120 drivers/base/bus.c:579)
[<80b44a1c>] (bus_remove_device) from [<80b3ed80>] (device_del+0x148/0x38c drivers/base/core.c:3878)
 r9:859ab088 r8:83a20000 r7:04208060 r6:00000000 r5:859aa830 r4:859aa874
[<80b3ec38>] (device_del) from [<80e9a240>] (usb_disable_device+0xd4/0x1e8 drivers/usb/core/message.c:1418)
 r10:00000100 r9:00000000 r8:00000000 r7:859aa800 r6:859ab000 r5:856fae88
 r4:00000002
[<80e9a16c>] (usb_disable_device) from [<80e8f008>] (usb_disconnect+0xec/0x2ac drivers/usb/core/hub.c:2344)
 r9:85817800 r8:859ab0cc r7:83cfb400 r6:859ab088 r5:859ab000 r4:60000113
[<80e8ef1c>] (usb_disconnect) from [<80e92004>] (hub_port_connect drivers/usb/core/hub.c:5406 [inline])
[<80e8ef1c>] (usb_disconnect) from [<80e92004>] (hub_port_connect_change drivers/usb/core/hub.c:5706 [inline])
[<80e8ef1c>] (usb_disconnect) from [<80e92004>] (port_event drivers/usb/core/hub.c:5870 [inline])
[<80e8ef1c>] (usb_disconnect) from [<80e92004>] (hub_event+0x1194/0x1950 drivers/usb/core/hub.c:5952)
 r10:00000100 r9:83b6af2c r8:83cfac00 r7:859ab000 r6:83b6a800 r5:00000001
 r4:00000001
[<80e90e70>] (hub_event) from [<8027a398>] (process_one_work+0x1b4/0x4f4 kernel/workqueue.c:3236)
 r10:832b4870 r9:83804e05 r8:83a20000 r7:dddced40 r6:83804e00 r5:83b6af2c
 r4:859bc980
[<8027a1e4>] (process_one_work) from [<8027afe0>] (process_scheduled_works kernel/workqueue.c:3319 [inline])
[<8027a1e4>] (process_one_work) from [<8027afe0>] (worker_thread+0x1fc/0x3d8 kernel/workqueue.c:3400)
 r10:61c88647 r9:83a20000 r8:859bc9ac r7:82804d40 r6:dddced40 r5:dddced60
 r4:859bc980
[<8027ade4>] (worker_thread) from [<80281fcc>] (kthread+0x12c/0x280 kernel/kthread.c:463)
 r10:00000000 r9:859bc980 r8:8027ade4 r7:df9e1e60 r6:859bca00 r5:83a20000
 r4:00000001
[<80281ea0>] (kthread) from [<80200114>] (ret_from_fork+0x14/0x20 arch/arm/kernel/entry-common.S:137)
Exception stack(0xdfdd5fb0 to 0xdfdd5ff8)
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 r5:80281ea0
 r4:859be300
Rebooting in 86400 seconds..