[<0>] do_wait+0x53/0x120
[<0>] kernel_wait+0x4a/0x90
[<0>] call_usermodehelper_exec_work+0x61/0xb0
[<0>] process_one_work+0x196/0x3c0
[<0>] worker_thread+0x281/0x3a0
[<0>] kthread+0x104/0x110
[<0>] ret_from_fork+0x2b/0x50
