Issue #18129 has been updated by jemmai (Jemma Issroff). Status changed from Open to Closed Closing, cannot reproduce this. @rm155 please feel free to reopen with reproduction instructions if the bug still exists. ---------------------------------------- Bug #18129: Ractor-incompatible global variables can be accessed through alias https://bugs.ruby-lang.org/issues/18129#change-105319 * Author: rm155 (Rohit Menon) * Status: Closed * Priority: Normal * Backport: 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN ---------------------------------------- Some global variables are not allowed in non-main Ractors. For example, the following code does not run: ``` ruby Ractor.new do $/ end.take #=> can not access global variables $/ from non-main Ractors (Ractor::IsolationError) ``` This error message is expected because $/ is not allowed outside the main Ractor. However, if the variable is aliased, it sometimes bypasses this. For example, the following code sometimes runs unexpectedly without error: ``` ruby alias $alias_global_variable $/ Ractor.new do $alias_global_variable end.take ``` Sometimes, it correctly fails with the message “can not access global variables $alias_global_variable from non-main Ractors (Ractor::IsolationError)”. However, because the global variable is sometimes accessed without error, this could lead to data races. -- https://bugs.ruby-lang.org/