unbuffered-signal-channel

Detect unbuffered channels used for signal notification.

Updated Aug 2, 2026View as Markdown

Default severity: warning

The os/signal package uses non-blocking sends to deliver notifications. If no receiver is immediately ready, an unbuffered channel drops the signal. Give the channel enough capacity for the signals being handled.

Bad

ch := make(chan os.Signal)
signal.Notify(ch, os.Interrupt)

Good

ch := make(chan os.Signal, 1)
signal.Notify(ch, os.Interrupt)