lsstack (pstack for Linux)

Dear friends.
I download your precious source code and compiled it. I saw it is working
well in program with single thread. so I tried to adapt the code to my
program. My program create a lot of threads during working. when I execute
the lsstrack with pid of my program I just could see the trace from main()
to first thread.

I upload the log.
I can find one thing like below :
---------------------------------------------------------------------------
---------------
Fetching address for symbol: __pthread_threads_debug
Failed to find thread symbol __pthread_threads_debug
---------------------------------------------------------------------------
-----------------
thank you for your attention!