Segmentation fault when using flex


I’m able to run most of the examples with the PhysX engine (both, physx and physx_gpu options work). However, when using flex, I get a Segmentation fault error. For example, when running python --flex, I get the following error:

Importing module ‘gym_37’ (/home/aa/isaacgym/python/isaacgym/_bindings/linux-x86_64/
Setting GYM_USD_PLUG_INFO_PATH to /home/aa/isaacgym/python/isaacgym/_bindings/linux-x86_64/usd/plugInfo.json
Loading asset ‘urdf/icosphere.urdf’ from ‘…/…/assets’
Soft Material Properties:
(Body 0) youngs: 100000.0 poissons: 0.44999998807907104 damping: 0.0
Creating 1 environments
Segmentation fault (core dumped)

I followed all the instructions for installation in a conda environment (including the troubleshooting section in the documentation). On running vulkaninfo, I get the following output for VkPhysicalDeviceDriverProperties:


driverName         = NVIDIA
driverInfo         = 460.32.03
conformanceVersion =

I’m running this on Ubuntu 20.04 with an RTX 3080 and CUDA version 11.2. I’ve also tried running this on Ubuntu 18.04 with a laptop GTX 1060 and that works perfectly fine.

Would appreciate any help troubleshooting this.

Thank you,

Hi @ayusha ,

Sorry for the late reply on this. We’ve been tracking this down and are close to having a solution. This will make our next release.

Take care,