[<ffffffff8101b664>] save_stack_trace_tsk+0x24/0x50
[<ffffffff811fec44>] proc_pid_stack+0xa4/0xf0
[<ffffffff81200ab4>] proc_single_show+0x64/0xa0
[<ffffffff811b7952>] seq_read+0xf2/0x400
[<ffffffff81192215>] vfs_read+0xb5/0x1a0
[<ffffffff81192561>] sys_read+0x51/0xb0
[<ffffffff8100b0d2>] system_call_fastpath+0x16/0x1b
[<ffffffffffffffff>] 0xffffffffffffffff