Potential trollius issue

System Info

• Operating System: Docker container running on: Linux 2b5aca1a9b8b 4.4.0-130-generic #156-Ubuntu SMP Thu Jun 14 08:53:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
• Python Version: python --version Python 2.7.12 python3 --version Python 3.5.2
• Version of catkin_tools:

catkin --version
catkin_tools 0.4.4 (C) 2014-2018 Open Source Robotics Foundation
catkin_tools is released under the Apache License, Version 2.0 (http://www.apache.org/licenses/LICENSE-2.0)
---
Using Python 3.5.2 (default, Nov 23 2017, 16:37:01) [GCC 5.4.0 20160609]

• ROS Distro: kinetic

Build / Run Issue

• I did not read this

Expected Behavior

Output build status correctly to the terminal and cleanly exit

Actual Behavior

root@dadc0fe3d78b:/home/ws# catkin build
-------------------------------------------------------
Profile:                     default
Extending:        [explicit] /opt/ros/kinetic
Workspace:                   /home/ws
-------------------------------------------------------
Source Space:       [exists] /home/ws/src
Log Space:         [missing] /home/ws/logs
Build Space:        [exists] /home/ws/build
Devel Space:        [exists] /home/ws/devel
Install Space:     [missing] /home/ws/install
DESTDIR:            [unused] None
-------------------------------------------------------
Devel Space Layout:          linked
Install Space Layout:        merged
-------------------------------------------------------
Additional CMake Args:       -DCMAKE_BUILD_TYPE=Release
Additional Make Args:        None
Additional catkin Make Args: None
Internal Make Job Server:    True
Cache Job Environments:      False
-------------------------------------------------------
Whitelisted Packages:        None
Blacklisted Packages:        None
-------------------------------------------------------
Workspace configuration appears valid.

NOTE: Forcing CMake to run for each package.
-------------------------------------------------------
[build] Found '1' packages in 0.0 seconds.                                                                                                                                                                                                    
Starting  >>> catkin_tools_prebuild                                                                                                                                                                                                           
Finished  <<< catkin_tools_prebuild                [ 2.2 seconds ]                                                                                                                                                                            
Starting  >>> <Project_Name>                                                                                                                                                                                                                       
Finished  <<< <Project_Name>                        [ 3.3 seconds ]                                                                                                                                                                            
[build] Summary: All 2 packages succeeded!                                                                                                                                                                                                    
[build]   Ignored:   None.                                                                                                                                                                                                                    
[build]   Warnings:  None.                                                                                                                                                                                                                    
[build]   Abandoned: None.                                                                                                                                                                                                                    
[build]   Failed:    None.                                                                                                                                                                                                                    
[build] Runtime: 5.4 seconds total.                                                                                                                                                                                                           
[build] Note: Workspace packages have changed, please re-source setup files to use them.
Exception ignored in: <bound method BaseEventLoop.__del__ of <_UnixSelectorEventLoop running=False closed=True debug=False>>
Traceback (most recent call last):
  File "/usr/local/lib/python3.5/dist-packages/trollius/base_events.py", line 395, in __del__
  File "/usr/local/lib/python3.5/dist-packages/trollius/unix_events.py", line 65, in close
  File "/usr/local/lib/python3.5/dist-packages/trollius/unix_events.py", line 166, in remove_signal_handler
  File "/usr/lib/python3.5/signal.py", line 47, in signal
TypeError: signal handler must be signal.SIG_IGN, signal.SIG_DFL, or a callable object

This error output shows up after catkin build, catkin run_tests, and catkin test. It does NOT show up after catkin_make or catkin_test_results build.

Steps to Reproduce the Issue

We are using a modified kinetic ros docker - added pip/catkin etc. Single simple package, few system deps, build, run tests.

Any idea if this is a trollius issue directly or a python2/3 issue?

[cardboardcode]

Hi guys, just wanted to elaborate on what @dimon777 said about

"when i switch my python to use python2.7 problem doesn't show up".

To switch back to use python2.7, ensure that your python3 does not have catkin-tools installed.

1. Check if said package is installed in python3, run the command below in terminal. $ pip3 freeze | grep catkin-tools

If there is no output, then it is confirmed that there is no conflicting catkin-tools packages installed on python3 side.

1. Ensure that your default python is python2.7 by running the command below. $ python -V

If not, you can follow this suggested link to change it to python2.7.

1. Install the python2.7 catkin-tools package, follow the commands below: sudo pip install -U catkin_tools This command is based on the official catkin documentation.

Hope this helps.

[bangyanz]

I experienced this in Ubuntu 18.04. Couldn’t find a solution.