The tests under fuzz/ only seem to be usable in conjunction with a nontrivial harness, such as OSS-Fuzz, or something similar; when bugs are inevitably reported, we need a way to reproduce them locally to diagnose and fix them, but it's not clear how to do this. We need some documentation (at least) for how to address this.

(Note that I am able to diagnose some that are found internally at Google in our fuzz-testing framework, but this will not be useful to the many Halide contributors who don't work at Google.)

attn @silvergasp