v4.2.1

SagerNet/sing-boxv4.2.1Aug 22, 2025by ravitemer

AI Summary

A maintenance release addressing deadlock issues in workspace caching by improving lock file handling and retry mechanisms.

Key Highlights

Improved workspace cache locking to prevent deadlocks
Increased lock retry delay
Automatic stale lock cleanup

Full Release Notes


### Fixed

- **Workspace Cache Locking**: Improved lock file handling to prevent persistent deadlocks
  - Increased lock retry delay from 50ms to 100ms for better stability
  - Added automatic stale lock file cleanup after maximum retry attempts
  - Implemented recursive retry mechanism with infinite loop protection
  - Enhanced error messaging and logging for lock acquisition failures
  - Resolves issue where crashed processes could leave persistent lock files blocking new hub instances