fs: dcookie: 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:

[  191.835040] WARNING: CPU: 12 PID: 9725 at lib/debugobjects.c:260 debug_print_object+0x8c/0xb0()
[  191.838129] ODEBUG: free active (active state 0) object type: timer_list hint: delayed_work_timer_fn+0x0/0x20
[  191.840545] Modules linked in:
[  191.841297] CPU: 12 PID: 9725 Comm: trinity-c141 Not tainted 3.15.0-rc2-next-20140423-sasha-00018-gc4ff6c4 #408
[  191.842479]  0000000000000009 ffff88000a8ebc38 ffffffff975271f2 0000000000000001
[  191.842479]  ffff88000a8ebc88 ffff88000a8ebc78 ffffffff9415afcc ffff88000a8a3d98
[  191.842479]  ffff8801b3ad5140 ffffffff98e76200 ffffffff988dc502 ffffffff9b70c870
[  191.842479] Call Trace:
[  191.842479] dump_stack (lib/dump_stack.c:52)
[  191.842479] warn_slowpath_common (kernel/panic.c:430)
[  191.842479] warn_slowpath_fmt (kernel/panic.c:445)
[  191.842479] debug_print_object (lib/debugobjects.c:262)
[  191.842479] ? __queue_work (kernel/workqueue.c:1452)
[  191.842479] __debug_check_no_obj_freed (lib/debugobjects.c:697)
[  191.842479] debug_check_no_obj_freed (lib/debugobjects.c:726)
[  191.842479] kmem_cache_free (mm/slub.c:2689 mm/slub.c:2717)
[  191.871535] ? kmem_cache_destroy (mm/slab_common.c:363)
[  191.871535] kmem_cache_destroy (mm/slab_common.c:363)
[  191.871535] dcookie_unregister (fs/dcookies.c:302 fs/dcookies.c:343)
[  191.871535] event_buffer_release (arch/x86/oprofile/../../../drivers/oprofile/event_buffer.c:153)
[  191.871535] __fput (fs/file_table.c:217)
[  191.871535] ____fput (fs/file_table.c:253)
[  191.871535] task_work_run (kernel/task_work.c:125 (discriminator 1))
[  191.871535] do_notify_resume (include/linux/tracehook.h:196 arch/x86/kernel/signal.c:751)
[  191.871535] int_signal (arch/x86/kernel/entry_64.S:807)


Thanks,
Sasha
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