nushell: Nushell hangs CPU in debug mode

Describe the bug

I’m seeing Nushell hang occasionally in macOS as I’m developing. I managed to catch it and attach a debugger to see where it was:

  * frame #0: 0x0000000190a4cacc libsystem_kernel.dylib`read + 8
    frame #1: 0x0000000102423170 nu`crossterm::event::sys::unix::file_descriptor::FileDesc::read::hfbd23575769f9401 + 28
    frame #2: 0x00000001024216b4 nu`_$LT$crossterm..event..source..unix..mio..UnixInternalEventSource$u20$as$u20$crossterm..event..source..EventSource$GT$::try_read::hbbc0fab5c8f663e4 + 320
    frame #3: 0x00000001024226f8 nu`crossterm::event::read::InternalEventReader::poll::h36c3e8abbd07d8a9 + 360
    frame #4: 0x000000010241ea0c nu`crossterm::event::poll_internal::h0048b8dda3aba103 + 172
    frame #5: 0x000000010242307c nu`crossterm::cursor::sys::unix::read_position_raw::hd8205425dcf4d786 + 140
    frame #6: 0x0000000102d99548 nu`reedline::painting::painter::Painter::initialize_prompt_position::h536603ca530d65c6 + 84
    frame #7: 0x0000000102d8a024 nu`reedline::engine::Reedline::read_line::hf3ee01bf075925f5 + 80
    frame #8: 0x00000001024f09f8 nu`nu_cli::repl::evaluate_repl::h0038740f8bd590bd + 9328
    frame #9: 0x00000001024ad2d0 nu`nu::run::run_repl::h9453fd09d0b40fa3 + 384

How to reproduce

1. Start in zsh as root shell
2. Run a release version of nushell
3. From inside nushell, run cargo run in the nushell repo
4. Immediately, exit

Expected behavior

There shouldn’t be any hang on exit.

Screenshots

No response

Configuration

key	value
version	0.83.1
branch	main
commit_hash	8403fff34500d30439545519c88c7d942c717e3e
build_os	macos-aarch64
build_target	aarch64-apple-darwin
rust_version	rustc 1.69.0 (84c898d65 2023-04-16)
rust_channel	1.69.0-aarch64-apple-darwin
cargo_version	cargo 1.69.0 (6e9a83356 2023-04-12)
build_time	2023-07-29 05:50:17 +12:00
build_rust_channel	debug
allocator	standard
features	default, sqlite, trash, which, zip
installed_plugins

Additional context

No response