[<ffffffff830b6c8e>] proc_pid_stack+0xae/0x100 [<ffffffff830b7ce2>] proc_single_show+0x52/0x90 [<ffffffff83062db0>] seq_read+0x110/0x420 [<ffffffff8303ad3f>] vfs_read+0x9f/0x170 [<ffffffff8303bc0f>] SyS_read+0x7f/0xf0 [<ffffffff8353a85b>] system_call_fastpath+0x22/0x27 [<ffffffffffffffff>] 0xffffffffffffffff