PyRep: Example program hangs in headless mode

Hi, when I ran an example in headless mode with xvfb, I got the following execution and it hangs there after Reached target 5!.

$ xvfb-run python ~/repos/PyRep/examples/example_panda_reach_target.py 
Reached target 0!
Reached target 1!
Reached target 2!
Reached target 3!
Reached target 4!
Reached target 5!
^C (SIGINT)
The X11 connection broke (error 1). Did the X11 server die?
QMutex: destroying locked mutex
QMutex: destroying locked mutex

But the expected behavior with GUI should be:

$ python ~/repos/PyRep/examples/example_panda_reach_target.py 
Reached target 0!
Reached target 1!
Reached target 2!
Reached target 3!
Reached target 4!
Reached target 5!
Reached target 6!
Reached target 7!
Reached target 8!
Reached target 9!
[CoppeliaSim:loadinfo]   done.
QObject::~QObject: Timers cannot be stopped from another thread

Do you have any suggestions? Thanks!

About this issue

Original URL
State: closed
Created 4 years ago
Comments: 18 (8 by maintainers)

Most upvoted comments

Confirming that glxgears works without any problem (have been running it for a few hours now)

shagunsodhani on Feb 3, 2021

I think this is an issue regarding the X11 server hanging, but not sure what exactly is causing it. We could try and alternative to Xvfb?

stepjam on Feb 3, 2021

Hmm, that is strange… What happens if you instead run the following:

Xvfb :99 -screen 0 1024x768x24 +extension GLX +render -noreset &
export DISPLAY=:99
python ~/repos/PyRep/examples/example_panda_reach_target.py

stepjam on Nov 18, 2020