Sometimes coder_scripts exit with:

2023-10-24 19:31:17.915 [warn]  /tmp/coder-startup-script.log script failed  log_path=/tmp/coder-startup-script.log  execution_time=29.626176306s  exit_code=255  error="exec: WaitDelay expired before I/O complete"

This usually means that a background/disowned process was started by the script and that the background process is still running and has references to file descriptors (usually stdout or stderr) when the script exits.

A simple fix is to redirect stdout and stderr (e.g. to a file, or discard):

my_background_process >/dev/null 2>&1 &

However, we can fix this by:

1. Improving the error message and linking to docs
2. Investigate if there's a way we can exit cleanly even when redirection isn't used