WARNING: ODEBUG bug in prism2sta_disconnect_usb

[syzbot]

Hello,

syzbot found the following crash on:

HEAD commit: e17994d1 usb: core: kcov: collect coverage from usb comple..
git tree: https://github.com/google/kasan.git usb-fuzzer
console output: https://syzkaller.appspot.com/x/log.txt?x=1129afe3e00000
kernel config: https://syzkaller.appspot.com/x/.config?x=5d64370c438bc60
dashboard link: https://syzkaller.appspot.com/bug?extid=6d2e7f6fa90e27be9d62
compiler: gcc (GCC) 9.0.0 20181231 (experimental)

Unfortunately, I don't have any reproducer for this crash yet.

IMPORTANT: if you fix the bug, please add the following tag to the commit:
Reported-by: syzbot+6d2e7f...@syzkaller.appspotmail.com

------------[ cut here ]------------
ODEBUG: free active (active state 0) object type: work_struct hint: hfa384x_usb_defer+0x0/0x430 include/linux/list.h:71
WARNING: CPU: 0 PID: 95 at lib/debugobjects.c:485 debug_print_object+0x160/0x250 lib/debugobjects.c:485
Kernel panic - not syncing: panic_on_warn set ...
CPU: 0 PID: 95 Comm: kworker/0:2 Not tainted 5.6.0-rc5-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Workqueue: usb_hub_wq hub_event
Call Trace:
__dump_stack lib/dump_stack.c:77 [inline]
dump_stack+0xef/0x16e lib/dump_stack.c:118
panic+0x2aa/0x6e1 kernel/panic.c:221
__warn.cold+0x2f/0x30 kernel/panic.c:582
report_bug+0x27b/0x2f0 lib/bug.c:195
fixup_bug arch/x86/kernel/traps.c:174 [inline]
fixup_bug arch/x86/kernel/traps.c:169 [inline]
do_error_trap+0x12b/0x1e0 arch/x86/kernel/traps.c:267
do_invalid_op+0x32/0x40 arch/x86/kernel/traps.c:286
invalid_op+0x23/0x30 arch/x86/entry/entry_64.S:1027
RIP: 0010:debug_print_object+0x160/0x250 lib/debugobjects.c:485
Code: dd 20 37 fc 85 48 89 fa 48 c1 ea 03 80 3c 02 00 0f 85 bf 00 00 00 48 8b 14 dd 20 37 fc 85 48 c7 c7 60 2b fc 85 e8 98 0b 29 ff <0f> 0b 83 05 0b 3a fb 05 01 48 83 c4 20 5b 5d 41 5c 41 5d c3 48 89
RSP: 0018:ffff8881d58c76b0 EFLAGS: 00010286
RAX: 0000000000000000 RBX: 0000000000000003 RCX: 0000000000000000
RDX: 0000000000040000 RSI: ffffffff812972fd RDI: ffffed103ab18ec8
RBP: 0000000000000001 R08: ffff8881d58b8000 R09: fffffbfff1266e8f
R10: fffffbfff1266e8e R11: ffffffff89337477 R12: ffffffff870d8b00
R13: ffffffff8119f700 R14: ffff8881d963cd20 R15: ffff8881d35b8e38
__debug_check_no_obj_freed lib/debugobjects.c:967 [inline]
debug_check_no_obj_freed+0x2e1/0x445 lib/debugobjects.c:998
slab_free_hook mm/slub.c:1441 [inline]
slab_free_freelist_hook mm/slub.c:1477 [inline]
slab_free mm/slub.c:3024 [inline]
kfree+0x18a/0x300 mm/slub.c:3976
prism2sta_disconnect_usb+0x76e/0xc30 drivers/staging/wlan-ng/prism2usb.c:209
usb_unbind_interface+0x1bd/0x8a0 drivers/usb/core/driver.c:436
__device_release_driver drivers/base/dd.c:1137 [inline]
device_release_driver_internal+0x42f/0x500 drivers/base/dd.c:1168
bus_remove_device+0x2eb/0x5a0 drivers/base/bus.c:533
device_del+0x481/0xd30 drivers/base/core.c:2677
usb_disable_device+0x23d/0x790 drivers/usb/core/message.c:1237
usb_disconnect+0x293/0x900 drivers/usb/core/hub.c:2211
hub_port_connect drivers/usb/core/hub.c:5046 [inline]
hub_port_connect_change drivers/usb/core/hub.c:5335 [inline]
port_event drivers/usb/core/hub.c:5481 [inline]
hub_event+0x1a1d/0x4300 drivers/usb/core/hub.c:5563
process_one_work+0x94b/0x1620 kernel/workqueue.c:2264
process_scheduled_works kernel/workqueue.c:2326 [inline]
worker_thread+0x7ab/0xe20 kernel/workqueue.c:2412
kthread+0x318/0x420 kernel/kthread.c:255
ret_from_fork+0x24/0x30 arch/x86/entry/entry_64.S:352
Kernel Offset: disabled
Rebooting in 86400 seconds..


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