Issue #19906 has been updated by HParker (Adam Hess). Updated reproduction script: Maybe this is a better reproduction? ```ruby a = RubyVM::InstructionSequence.compile("foo(bar: :baz)").to_binary 10.times do 500_000.times do RubyVM::InstructionSequence.load_from_binary(a) end puts `ps -o rss= -p #{$$}` end ``` before: ``` 20244 31760 40572 48468 55324 63712 71260 79552 87224 94492 ``` after: ``` 13156 16072 16080 16620 16620 16620 16628 16672 16672 16672 ``` ---------------------------------------- Bug #19906: fix kwarg memory leak https://bugs.ruby-lang.org/issues/19906#change-104805 * Author: HParker (Adam Hess) * Status: Closed * Priority: Normal * Backport: 3.0: UNKNOWN, 3.1: UNKNOWN, 3.2: UNKNOWN ---------------------------------------- GitHub PR: https://github.com/ruby/ruby/pull/8556 ci info tracks kwargs and which are shared across aliases ```ruby 30.times do 100_000.times do def foo(k:); yield; end alias bar foo undef foo end puts `ps -o rss= -p #{$$}` end ``` before: ``` 30364 45120 59700 73932 88512 102680 116884 130884 145308 159688 174468 188680 203016 216908 231568 246096 260592 274900 289168 303420 317620 331956 346148 360708 374880 389172 403472 417824 432016 446040 460196 474604 489152 503248 517504 531944 546228 560520 574760 589108 ``` after: ``` 8760 8940 9156 9540 9548 9548 9548 9548 9548 9548 9548 9548 9548 9548 9548 9548 9548 9548 9548 9548 9556 9564 9564 9564 9564 9564 9564 9564 9564 9564 9564 9564 9564 9576 9744 9744 9744 9744 9744 9936 ``` -- https://bugs.ruby-lang.org/