Issue #20161 has been updated by nagachika (Tomoyuki Chikanaga). Backport changed from 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: REQUIRED to 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED ruby_3_2 a26b41bf7a2db69b0889ed599f568a4ba2529eba merged revision(s) 37ed86fd3c798e298fad9db6e7df1f3f45e1e03b. ---------------------------------------- Bug #20161: Memory leak in regexp grapheme clusters https://bugs.ruby-lang.org/issues/20161#change-106309 * Author: peterzhu2118 (Peter Zhu) * Status: Closed * Priority: Normal * Backport: 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: DONE, 3.3: REQUIRED ---------------------------------------- GitHub PR: https://github.com/ruby/ruby/pull/9447 The cc->mbuf gets overwritten, so we need to free it to not leak memory. For example: ```ruby str = "hello world".encode(Encoding::UTF_32LE) 10.times do 1_000.times do str.grapheme_clusters end puts `ps -o rss= -p #{$$}` end ``` Before: ``` 15536 15760 15920 16144 16304 16480 16640 16784 17008 17280 ``` After: ``` 15584 15584 15760 15824 15888 15888 15888 15888 16048 16112 ``` -- https://bugs.ruby-lang.org/