Issue #20304 has been updated by k0kubun (Takashi Kokubun). Backport changed from 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: REQUIRED, 3.3: REQUIRED to 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: REQUIRED, 3.3: DONE This seems to have been backported to ruby_3_3 at commit:a24802e8fd7. ---------------------------------------- Bug #20304: Memory leak when setting Encoding.default_internal https://bugs.ruby-lang.org/issues/20304#change-108494 * Author: MaxLap (Maxime Lapointe) * Status: Closed * ruby -v: 3.3.0 * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: REQUIRED, 3.3: DONE ---------------------------------------- Problem is present in Ruby 3.2.2, 3.2.3, 3.3.0. Didn't check before. Put this in a file: ``` 10.times do 100000.times do Encoding.default_internal = nil end puts `ps -o rss= -p #{$$}`.to_i end ``` Result: ``` $ ruby local.rb 27044 30212 33116 36284 39452 42620 45788 48956 51860 55028 ``` -- https://bugs.ruby-lang.org/