Expected Behavior

dune build finishes

Actual Behavior

dune build freezes.

Reproduction

I've added (cache enabled) to ~/.config/dune/config.

Then setup infer Infer with ./configure && make.

Then under infer/src I ran dune cache start --foreground in one terminal and dune build in the other.

dune cache output is

# accept client: 127.0.0.1:49327
# 127.0.0.1:49327: received command: (set-build-root /Users/arr/infer/infer/src/_build)
# 127.0.0.1:49327: ended

At the same time dtruss on dune build process shows a bunch of:

select(0x0, 0x0, 0x0, 0x0, 0x70000CA20F90)               = 0 0

which is very weird -- basically, dune build does polling on 0 file descriptors.

Specifications

• Version of dune (output of dune --version): 2.3.1
• Version of ocaml (output of ocamlc --version): 4.08.1
• Operating system (distribution and version): MacOS 10.15.3