Issue #21947 has been updated by ioquatix (Samuel Williams). See <https://github.com/ruby/ruby/pull/16340> as a proposed fix. ---------------------------------------- Bug #21947: `Timeout.timeout` doesn't use `Timeout::ExitException` when Fiber scheduler is in use. https://bugs.ruby-lang.org/issues/21947#change-116634 * Author: ioquatix (Samuel Williams) * Status: Open * Assignee: ioquatix (Samuel Williams) * Backport: 3.3: REQUIRED, 3.4: REQUIRED, 4.0: REQUIRED ---------------------------------------- The following example executes successfully after 7 seconds instead of timing out after 2. ```ruby require 'async' require 'net/http' start = Time.now Sync do Timeout.timeout 2 do Net::HTTP.get(URI 'https://httpbin.org/delay/5') puts "...request finished, no timeout though; in #{Time.now - start}s" end end puts "Duration: #{Time.now - start}s" # => ...request finished, no timeout though; in 7.7007s # Duration: 7.700962s ``` There are two issues: - `Net::HTTP` rescues `Timeout::Error` and retries. This causes 2s (timeout -> retry) + 5s execution time. - `Timeout.timeout` uses `Timeout::ExitException` when no exception is specified, but the Fiber scheduler code path was not updated. See <https://github.com/socketry/async/issues/448> for more discussion. -- https://bugs.ruby-lang.org/