The Phantom Deadlock: When Rails, Sidekiq, and PostgreSQL Collide

📰 Dev.to · Alex Aslam

Learn how to identify and resolve the Phantom Deadlock issue in Rails applications using Sidekiq and PostgreSQL

intermediate Published 11 Jun 2025
Action Steps
  1. Investigate Sidekiq dashboard for stuck or stalled jobs
  2. Check PostgreSQL logs for deadlock errors
  3. Run 'sidekiq restart' to clear stuck jobs
  4. Configure Sidekiq to use a retry mechanism for failed jobs
  5. Apply PostgreSQL locking mechanisms to prevent deadlocks
Who Needs to Know This

Developers and DevOps engineers working with Rails, Sidekiq, and PostgreSQL will benefit from understanding this issue to prevent and resolve it in their applications

Key Insight

💡 The Phantom Deadlock can occur when Sidekiq and PostgreSQL collide, causing stuck jobs and errors

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🚨 Phantom Deadlock alert! 🚨 Learn how to identify and resolve this issue in your Rails apps using Sidekiq and PostgreSQL

Key Takeaways

Learn how to identify and resolve the Phantom Deadlock issue in Rails applications using Sidekiq and PostgreSQL

Full Article

It was 3 AM when PagerDuty screamed into the void. Our Sidekiq dashboard showed a nightmare:...
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