Unsafe World Random Access Detector

Posted on May 26, 2025

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Loaders: fabric, forge, neoforge

Unsafe World Random Access Detector

This is a mod that detects unsafe off-thread world random access, helping to find causes of “Accessing LegacyRandomSource from multiple threads” crash.

This is useful for finding the cause of mysterious crashes with Accessing LegacyRandomSource from multiple threads.
This is not a fix for the issue, but it will help you find the cause of the issue.

Example

Note: If you are already using C2ME, this mod is not needed (but won’t crash if used together anyway).