Issue #19624 has been reported by pineman (João Pinheiro). ---------------------------------------- Bug #19624: Backticks - IO object leakage https://bugs.ruby-lang.org/issues/19624 * Author: pineman (João Pinheiro) * Status: Open * Priority: Normal * ruby -v: ruby 3.2.2 (2023-03-30 revision e51014f9c0) [arm64-darwin22] * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- Hi, This code works on ruby 3.0.6: ```ruby `echo` ObjectSpace.each_object(IO) do |io| if ![STDIN, STDOUT, STDERR].include?(io) io.close end end ``` but raises `IOError` on 3.2.2: ``` minimal-repro-case.rb:8:in `close': uninitialized stream (IOError) ``` I found it started failing on ruby 3.1.0 and after, on macOS and Linux. This code is useful for closing unneeded IO objects in forked processes. It looks like backticks is 'leaking' IO objects, waiting for GC, and it didn't used to in 3.1.0. In ruby 3.1.0, inside `rb_f_backquote`, `rb_gc_force_recycle` was removed in favor of `RB_GC_GUARD`. I wonder if this has something to do with the problem. Is this code incorrect since ruby 3.1.0 or is it a bug in ruby? Thanks. ---Files-------------------------------- minimal-repro-case.rb (109 Bytes) -- https://bugs.ruby-lang.org/