Issue #20228 has been updated by mame (Yusuke Endoh). Good find, thanks! I'm a little concerned about the overhead of `rb_protect` for a typical simple match, but it's neglectable? ---------------------------------------- Bug #20228: Memory leak in Regexp timeout https://bugs.ruby-lang.org/issues/20228#change-106541 * Author: peterzhu2118 (Peter Zhu) * Status: Open * Priority: Normal * Backport: 3.0: UNKNOWN, 3.1: DONTNEED, 3.2: REQUIRED, 3.3: REQUIRED ---------------------------------------- GitHub PR: https://github.com/ruby/ruby/pull/9765 If a Regexp::TimeoutError is raised, the `stk_base` and `OnigRegion` will leak. For example: ```ruby Regexp.timeout = 0.001 regex = /^(a*)*$/ str = "a" * 1000000 + "x" 10.times do 100.times do begin regex =~ str rescue end end puts `ps -o rss= -p #{$$}` end ``` Before: ``` 328800 632416 934368 1230448 1531088 1831248 2125072 2414384 2703440 2995664 ``` After: ``` 39280 47888 49024 56240 56496 56512 56592 56592 56720 56720 ``` -- https://bugs.ruby-lang.org/