Issue #20803 has been updated by byroot (Jean Boussier). I've seen this sort of failures happen in the past, the root cause generally is that there is another test that runs first an create that symbol in a dynamic way: `"abc".to_sym`. The solution is to use a more unique symbol value to avoid clashes. ---------------------------------------- Bug #20803: Windows intermittent spec failure - ObjectSpace.memsize_of(:abc) https://bugs.ruby-lang.org/issues/20803#change-110218 * Author: MSP-Greg (Greg L) * Status: Open * ruby -v: master * Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN ---------------------------------------- This frequently fails on ruby-loco's mingw build, but I think there have been less frequent failures on ucrt and mswin. I've started a new GHA build when it occurs, and it usually passes. I could not repro locally. ``` ObjectSpace.memsize_of returns 0 for literal Symbols FAILED Expected 40 == 0 to be truthy but was false /ruby/spec/ruby/library/objectspace/memsize_of_spec.rb:16:in 'block (2 levels) in <top (required)>' /ruby/spec/ruby/library/objectspace/memsize_of_spec.rb:4:in '<top (required)>' ``` The test code: ```ruby it "returns 0 for literal Symbols" do ObjectSpace.memsize_of(:abc).should == 0 end ``` ``` -- https://bugs.ruby-lang.org/