usb: mon: freeing active timer

[Sasha Levin]

Hi all,

While fuzzing with trinity inside a KVM tools guest running the latest -next
kernel I've stumbled on the following:

[ 1361.390880] WARNING: CPU: 10 PID: 24274 at lib/debugobjects.c:260 debug_print_object+0x8c/0xb0()
[ 1361.391203] ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x20
[ 1361.391203] Modules linked in:
[ 1361.391203] CPU: 10 PID: 24274 Comm: trinity-c83 Not tainted 3.15.0-rc2-next-20140423-sasha-00018-gc4ff6c4 #408
[ 1361.391203]  0000000000000009 ffff8801de341c78 ffffffffb85271f2 0000000000000001
[ 1361.391203]  ffff8801de341cc8 ffff8801de341cb8 ffffffffb515afcc ffff8801eb3ebd98
[ 1361.391203]  ffff8801eb751870 ffffffffb9e76200 ffffffffb98dc502 ffffffffbc702550
[ 1361.391203] Call Trace:
[ 1361.391203] dump_stack (lib/dump_stack.c:52)
[ 1361.391203] warn_slowpath_common (kernel/panic.c:430)
[ 1361.391203] warn_slowpath_fmt (kernel/panic.c:445)
[ 1361.391203] debug_print_object (lib/debugobjects.c:262)
[ 1361.391203] ? __queue_work (kernel/workqueue.c:1452)
[ 1361.391203] __debug_check_no_obj_freed (lib/debugobjects.c:697)
[ 1361.391203] debug_check_no_obj_freed (lib/debugobjects.c:726)
[ 1361.391203] kmem_cache_free (mm/slub.c:2689 mm/slub.c:2717)
[ 1361.391203] ? kmem_cache_destroy (mm/slab_common.c:363)
[ 1361.391203] kmem_cache_destroy (mm/slab_common.c:363)
[ 1361.391203] mon_text_release (drivers/usb/mon/mon_text.c:643)
[ 1361.391203] __fput (fs/file_table.c:217)
[ 1361.391203] ____fput (fs/file_table.c:253)
[ 1361.391203] task_work_run (kernel/task_work.c:125 (discriminator 1))
[ 1361.391203] do_notify_resume (include/linux/tracehook.h:196 arch/x86/kernel/signal.c:751)
[ 1361.391203] int_signal (arch/x86/kernel/entry_64.S:807)


Thanks,
Sasha
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