Bug #20803: Windows intermittent spec failure - ObjectSpace.memsize_of(:abc)

• Status: Closed
• Assignee: -
• Target version: -
• ruby -v: master
• Backport: 3.1: UNKNOWN, 3.2: UNKNOWN, 3.3: UNKNOWN

[MSP-Greg (Greg L)]

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:

it "returns 0 for literal Symbols" do
  ObjectSpace.memsize_of(:abc).should == 0
end

[MSP-Greg (Greg L)]

• Subject changed from Windows intermittent spec failure to Windows intermittent spec failure - ObjectSpace.memsize_of

[MSP-Greg (Greg L)]

• Subject changed from Windows intermittent spec failure - ObjectSpace.memsize_of to Windows intermittent spec failure - ObjectSpace.memsize_of(:abc)

[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.

[byroot (Jean Boussier)]

https://github.com/ruby/ruby/pull/11942

[byroot (Jean Boussier)]

• Status changed from Open to Closed