A second machine works just fine without the artifacts. Same kernel, same Mesa
version.

Glinfo:
GL_VERSION: 3.0 Mesa 18.1.4
GL_RENDERER: Mesa DRI Intel(R) Haswell Mobile 
GL_VENDOR: Intel Open Source Technology Center
GL_SHADING_LANGUAGE_VERSION = 1.30
GLU_VERSION: 1.3
GLU_EXTENSIONS: GLU_EXT_nurbs_tessellator GLU_EXT_object_space_tess 
GLUT_API_VERSION: 4
GLUT_XLIB_IMPLEMENTATION: 13