Due to an oversight in the pipeline pool/shader, pipelines that were
invalid (as subresources where destroyed) could still be selected for
reused. This happened more often when using the compositor as it
recreates shaders a lot. It also depended on how handles are reuses by
driver implementation.
This is fixed by discarded any associated pipeline when the pipeline
layout is discarded.
Pull Request: https://projects.blender.org/blender/blender/pulls/138800
b81fcb9592