Issue #7999 has been updated by kosaki (Motohiro KOSAKI). This issue was introduced at r35163 (see [Bug#6098]). ---------------------------------------- Bug #7999: bootstarap test hungs at threading tests https://bugs.ruby-lang.org/issues/7999#change-37247 Author: ko1 (Koichi Sasada) Status: Assigned Priority: Normal Assignee: kosaki (Motohiro KOSAKI) Category: core Target version: current: 2.1.0 ruby -v: ruby 2.1.0dev On [ruby-list:49232], Ootani-san reported that Ruby 2.0.0p0 hungs on bootstarap test hungs at threading tests. assert_equal 'true', %{ t = Thread.new { loop {} } begin pid = fork { exit t.status != "run" } Process.wait pid $?.success? rescue NotImplementedError true end } He rewrites to " t = Thread.new { loop {sleep 1} }" and it work successfully. His environment is CentOS6.3 and VMware. He doubts this issue caused only on single-core processor because there is no problem on multi-core VM setting. I also observed same issue on VirtualBox with Ubuntu. I haven't check yet that it is only on single-core or not. I want to clarify the reason of this issue. Please give information about your environment if you have same issue. -- http://bugs.ruby-lang.org/