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The Wire · Showcase

SPRING STOPS CRASHING ON SLOW BOOTS, RAILS PATCHES VIEW RELOADER

By RepoJournal · Filed · About Rails

Spring 4.5.0 fixes the Errno::EPIPE crashes that kill processes when clients disconnect during preload, a critical stability issue for large monorepos that take >5 seconds to boot.

The Spring release [1] addresses a years-old reliability problem: when a client times out waiting for the preloader to finish (default 5 second window), unrescued socket writes [2] crash both the server and application processes. Shopify's monorepo made this reproducible on every slow boot. The same release adds post-environment-load hooks [1] and eagerly preloads framework base classes before the parent process forks, preventing side effects during first request. Meanwhile, Rails merged a ViewReloader fix [3] that stops constructing empty FileUpdateCheckers on every engine boot — a performance win for apps with lazy view paths. The ecosystem also landed a minitest compatibility fix [4] for request format assertions that broke when minitest changed how assert_nil works under the hood.

Action items

References

  1. [1] v4.5.0 ↗ rails/spring
  2. [2] Don't crash on client disconnect (Server and Application) ↗ rails/spring
  3. [3] Defer ViewReloader build when no view paths are registered ↗ rails/rails
  4. [4] Avoid assert_nil for Mime::NullType request format ↗ rails/rails

FAQ

What changed in Rails on May 2, 2026?
Spring 4.5.0 fixes the Errno::EPIPE crashes that kill processes when clients disconnect during preload, a critical stability issue for large monorepos that take >5 seconds to boot.
What should Rails teams do about it?
Upgrade spring to 4.5.0 immediately if you see EPIPE crashes on slow boots • Update rails main branch to pick up ViewReloader optimization before next release • Verify request format tests pass with latest minitest if you override assert_nil
Which Rails repositories shipped on May 2, 2026?
rails/spring, rails/rails

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