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Re: [Discuss-gnuradio] "Run to completion" not working with message pass

From: Marcus Müller
Subject: Re: [Discuss-gnuradio] "Run to completion" not working with message passing blocks
Date: Wed, 01 Apr 2015 12:10:41 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:31.0) Gecko/20100101 Thunderbird/31.5.0

Hi  Piotr,

nice to hear you got a step ahead!
I did that and what I obtained was:
  16   Thread 0x7fffbdffb700 (LWP 13462) "python"
pthread_cond_wait@@GLIBC_2.3.2 () at
  3    Thread 0x7fffe9720700 (LWP 13449) "gsm_clock_offs1"
pthread_cond_timedwait@@GLIBC_2.3.2 () at
* 1    Thread 0x7ffff7fc7740 (LWP 13444) "python" 0x00007ffff78e8da3 in
select () at ../sysdeps/unix/syscall-template.S:81

I'd have a blind guess:
Thread 16 might be the "surviving" part of a python-spawned Timer() thread, which caused a message _post at another thread, which might be something that hangs if that block's thread no longer exists.

Can you switch to that thread:
thread 16
and then try to get a python backtrace [1]
and maybe a simple C-style backtrace

that might give you some information what is actually waiting on a condition (which is what I guess from "pthread_cond_wait").


[1] for this to work, you might need to follow these instructions from http://gnuradio.org/redmine/projects/gnuradio/wiki/TutorialsGDB:

... make sure that the python development package is installed (python-devel on Redhatoids, python2.7-dev on Debianoids); for some systems, you should append the content of /usr/share/doc/{python-devel,python2.7-dev}/gdbinit[.gz] to your ~/.gdbinit, and re-start gdb.

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