Description of the problem / feature request:

--bes_backend specified in our .bazelrc
--build_event_binary_file added by intellij plugin

when specifying both bazel sometimes hang.

Bugs: what's the simplest, easiest way to reproduce this bug? Please provide a minimal example if possible.

bazel build //... --bes_backend=grpc://localhost:6000 --build_event_binary_file=build.log '--override_repository=intellij_aspect=/Users/darl/Library/Application Support/JetBrains/Toolbox/apps/IDEA-U/ch-0/212.5457.46/IntelliJ IDEA.app.plugins/ijwb/aspect' --output_groups=intellij-resolve-java-direct-deps,intellij-info-generic,intellij-info-java-direct-deps --aspects=@intellij_aspect//:intellij_info_bundled.bzl%intellij_info_aspect 

What operating system are you running Bazel on?

MacOS, Linux

What's the output of bazel info release?

release 5.0.0rc2

Have you found anything relevant by searching the web?

Nothing similar

Any other information, logs, or outputs that you want to share?

Thread dump of bazel when it hangs:
https://gist.github.com/darl/94141514150e09b2460030f283cc9f21