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wire 2026-05-30
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$ the-wire · showcase

RAILS KILLS DEADLOCK BUG IN BARE CONNECTIONS, PUSHES RACTOR SAFETY

By RepoJournal · Filed · About Rails · Composed from the cited sources · methodology

hmcguire-shopify gmcgibbon morgoth
3 people shipped this
hmcguire-shopify @hmcguire-shopify 1 cited gmcgibbon @gmcgibbon 1 cited morgoth @morgoth 1 cited

A fresh connection trying to check its database version was deadlocking against itself, and Shopify just shipped the fix.

Rails merged a critical fix for NullPool that was causing synchronization deadlocks [1] [2] [3]. The problem: when a bare connection (one using NullPool instead of ConnectionPool) queries server version on startup, it re-enters a Mutex-protected method that wasn't built for re-entrancy. A normal ConnectionPool uses a Monitor, which handles this gracefully, but NullPool's Mutex chokes. This is the kind of subtle bug that burns hours in production. Separately, Active Record is continuing its push toward Ractor safety [4] [5] by freezing and constantizing modules so they can be safely used in Ractorized contexts. This is table-stakes if you're running concurrent Ractors in your app. Documentation got a refresh with this week's TWIR [6] . Nothing earth-shaking here, but the connection deadlock fix is worth deploying immediately if you're using Rails with database connections that spin up fresh.

$ ls rails/reviews/ # the step-back reads

the week in review Active Storage gets a direct-upload kill switch the month in review Rails deepens Ractor safety, ships Marcel 2.0, and retires decade-old APIs
Topics: Ruby Full archive → Weekly reviews →

Quick answers

What shipped in Rails on May 30, 2026?
A fresh connection trying to check its database version was deadlocking against itself, and Shopify just shipped the fix. In total, 4 commits and 3 pull requests landed.
Who contributed to Rails on May 30, 2026?
3 developers shipped this update, including hmcguire-shopify, gmcgibbon, and morgoth.
What were the notable Rails updates?
Merge pull request #57506 from Shopify/hm-tnotxonttqlwlvyo, Fix NullPool#server_version deadlock, and Fix NullPool#server_version deadlock.
♥

$ log @rails --recent

Bootsnap guards d_type for Illumos, Rails trims Ractor test skips 17 shipped MySQL deadlock fix for find_or_create_by, Asset Pipeline guide rewrite 19 shipped kamipo retires three legacy Active Record holdovers 16 shipped Postgres index lookups scoped to the resolved table, mariadb replaces mysql5 in dbconsole 28 shipped

$ log --all # elsewhere on the wire

@openclaw Cold-start Gateway diagnostics stop crying wolf, doctor repairs plugin drift Agentic Coding Cline desktop bundles shrink, goose unblocks its own clicks

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