Issue #20311 has been updated by byroot (Jean Boussier). So https://github.com/ruby/ruby/pull/10143 is turning into a huge yak-shave and will be hard to backport. The reason is a lot of code end up relying on classes defined in C becoming immortal (in addition to being pinned). So maybe a better short term solution that is easy to backport is to just not use these API for naming structs: https://github.com/ruby/ruby/pull/10144 ---------------------------------------- Bug #20311: Struct.new("A") memory leak? https://bugs.ruby-lang.org/issues/20311#change-107077 * Author: MaxLap (Maxime Lapointe) * Status: Open * ruby -v: 3.3.0 * Backport: 3.0: WONTFIX, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED ---------------------------------------- The following code gives the impression of a memory leak. ``` 10.times do 5000.times do Struct.new("A") Struct.send(:remove_const, :A) end GC.start puts `ps -o rss= -p #{$$}`.to_i end ``` ``` 27868 35324 43400 51472 58676 66144 73764 81196 88512 95752 ``` Is there another location where the struct gets set that I need to clear up for the GC free the memory? Happens in 3.2.2, 3.2.3, 3.3.0, 3.3-head, ruby-head. -- https://bugs.ruby-lang.org/