[<ffffffff8101ba34>] save_stack_trace_tsk+0x24/0x50
[<ffffffff8123e0a4>] proc_pid_stack+0xa4/0xf0
[<ffffffff8123fff6>] proc_single_show+0x66/0xa0
[<ffffffff811f1e4e>] seq_read+0xee/0x440
[<ffffffff811c96d7>] vfs_read+0xb7/0x1a0
[<ffffffff811c9ad1>] sys_read+0x51/0xb0
[<ffffffff81572437>] system_call_fastpath+0x35/0x3a
[<ffffffffffffffff>] 0xffffffffffffffff