Issue #19338 has been updated by luke-gru (Luke Gruber). To simplify the problem, this hangs too: ```ruby MYCONSTANT = 1 Ractor.new do MYCONSTANT = 2 end.take ``` ---------------------------------------- Bug #19338: Ruby hangs when ouputting warnings inside ractor https://bugs.ruby-lang.org/issues/19338#change-101220 * Author: luke-gru (Luke Gruber) * Status: Open * Priority: Normal * Backport: 2.7: UNKNOWN, 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- This code causes Ruby to hang: ``` ruby rs = [] 2.times do rs << Ractor.new do MYCONSTANT = 2 end end rs.each(&:take) ``` There is a problem when the warning is being outputted with multiple ractors. A thread is calling RB_VM_LOCK() while holding the VM lock in ractor.c (ractor_check_blocking()) If the code is changed to RB_VM_LOCK_ENTER() and RB_VM_LOCK_LEAVE() then it fixes it, but I don't know if there's a better way. Thanks! -- https://bugs.ruby-lang.org/