From: merch-redmine@... Date: 2020-05-20T00:27:37+00:00 Subject: [ruby-core:98445] [Ruby master Bug#16900] Disposable call-cache introduced memory leak Issue #16900 has been reported by jeremyevans0 (Jeremy Evans). ---------------------------------------- Bug #16900: Disposable call-cache introduced memory leak https://bugs.ruby-lang.org/issues/16900 * Author: jeremyevans0 (Jeremy Evans) * Status: Open * Priority: Normal * Assignee: ko1 (Koichi Sasada) * Backport: 2.5: DONTNEED, 2.6: DONTNEED, 2.7: DONTNEED ---------------------------------------- commit:b9007b6c548f91e88fd3f2ffa23de740431fa969 (Introduce disposable call-cache) introduced a memory leak for classes that include or prepend modules. Taking the example memory leak script used in the commit message for commit:5922c954614e5947a548780bb3b894626affe6dd: ```ruby module M; def bar; end; end loop{ Class.new do def foo; end prepend M end } ``` There is unbounded growth: ``` jeremy 56984 0.0 0.1 59540 14940 p2 S+ 5:15PM 0:00.19 ruby example.rb jeremy 56984 0.0 0.1 61852 18640 p2 S+ 5:15PM 0:00.40 ruby example.rb jeremy 56984 0.0 0.1 62700 19940 p2 S+ 5:15PM 0:00.62 ruby example.rb jeremy 56984 0.0 0.1 63696 21364 p2 S+ 5:15PM 0:00.83 ruby example.rb jeremy 56984 4.1 0.1 64632 22748 p2 S+ 5:15PM 0:01.05 ruby example.rb jeremy 56984 4.1 0.1 65664 24188 p2 S+ 5:15PM 0:01.26 ruby example.rb jeremy 56984 4.1 0.2 66632 25432 p2 S+ 5:15PM 0:01.47 ruby example.rb jeremy 56984 4.1 0.2 67484 26552 p2 S+ 5:15PM 0:01.70 ruby example.rb jeremy 56984 8.5 0.2 68456 27772 p2 S+ 5:15PM 0:01.92 ruby example.rb jeremy 56984 8.5 0.2 69536 29164 p2 S+ 5:15PM 0:02.14 ruby example.rb jeremy 56984 8.5 0.2 70424 30252 p2 S+ 5:15PM 0:02.36 ruby example.rb ``` This issue appears to be limited to classes that include or prepend modules. * Same memory leak when switching from `prepend` to `include` * No memory leak when switching from `Class.new` to `Module.new` * No memory leak when removing the `prepend` * No memory leak when removing the `prepend` and subclassing the class. -- https://bugs.ruby-lang.org/ Unsubscribe: