Some kind of deadlock when running syntax checking/builds which hangs ST

[JarrettBillingsley]

• Sublime Text Version: Sublime Text 3 (Build 3211)
• Rust Enhanced Version: 2.23.0
• Operating system: Mac OS Catalina 10.15.5
• Expected behavior: When syntax checking runs, or I build the project, it should work. (It used to work.)
• Actual behavior:
  • When syntax checking runs, or I build the project, ST spawns a bash process which uses 100% of one CPU core but does nothing. It uses ~25MB RAM and doesn't seem to do any I/O.
  • From a call stack sampling, the ST plugin container process seems to be stuck on a poll call but I can't be sure.
  • This causes ST to hang and be unresponsive until I kill that bash process.
  • But if I kill the bash process, the behavior changes: now when I build, I get this error on the ST console:

Traceback (most recent call last):
  File "/Applications/Sublime Text.app/Contents/MacOS/sublime_plugin.py", line 1050, in run_
    return self.run(**args)
  File "/Users/me/Library/Application Support/Sublime Text 3/Installed Packages/Rust Enhanced.sublime-package/cargo_build.py", line 53, in run
  File "/Users/me/Library/Application Support/Sublime Text 3/Installed Packages/Rust Enhanced.sublime-package/cargo_build.py", line 74, in _detect_auto_build
  File "/Users/me/Library/Application Support/Sublime Text 3/Installed Packages/Rust Enhanced.sublime-package/rust/target_detect.py", line 35, in determine_targets
  File "/Users/me/Library/Application Support/Sublime Text 3/Installed Packages/Rust Enhanced.sublime-package/rust/util.py", line 136, in get_cargo_metadata
  File "/Users/me/Library/Application Support/Sublime Text 3/Installed Packages/Rust Enhanced.sublime-package/rust/rust_proc.py", line 97, in slurp_json
  File "/Users/me/Library/Application Support/Sublime Text 3/Installed Packages/Rust Enhanced.sublime-package/rust/rust_proc.py", line 79, in _slurp
  File "/Users/me/Library/Application Support/Sublime Text 3/Installed Packages/Rust Enhanced.sublime-package/rust/rust_proc.py", line 234, in run
  File "./python3.3/subprocess.py", line 819, in __init__
  File "./python3.3/subprocess.py", line 1448, in _execute_child
OSError: [Errno 7] Argument list too long

This behavior persists until I restart ST.

Rust was installed with rustup.

[officialcjunior]

I seem to have the same issue here on Arch Linux, as well