Fix use-after-free during EGL shutdown #2510
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`atexit` is used to `eglTerminate` the `EGL_DISPLAY` Any context created using that will fail in `glDestroyContext` because a stale display is used, i.e. one that was already terminated. Avoid this by setting `EGL_DISPLAY` back to `None` after termination and checking for that before using.
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atexitis used toeglTerminatetheEGL_DISPLAYAny context created using that will fail inglDestroyContextbecause a stale display is used, i.e. one that was already terminated.Avoid this by setting
EGL_DISPLAYback toNoneafter termination and checking for that before using.This can be reproduced with
MUJOCO_GL=egl python -c 'import mujoco; c = mujoco.GLContext(1280, 960)'This throws: