[ruby-core:118471] [Ruby master Bug#20145] Memory leak when duplicating identhash
From:
"nagachika (Tomoyuki Chikanaga) via ruby-core" <ruby-core@...>
Date:
2024-07-07 05:51:14 UTC
List:
ruby-core #118471
Issue #20145 has been updated by nagachika (Tomoyuki Chikanaga).
Backport changed from 3.0: UNKNOWN, 3.1: REQUIRED, 3.2: REQUIRED, 3.3: DONE to 3.1: WONTFIX, 3.2: WONTFIX, 3.3: DONE
My trial backpoting to ruby_3_2 introduce Segmentation fault. See https://github.com/nagachika/ruby/actions/runs/9824962371/job/27124518333
I gave up to backport this to ruby_3_2.
----------------------------------------
Bug #20145: Memory leak when duplicating identhash
https://bugs.ruby-lang.org/issues/20145#change-108985
* Author: peterzhu2118 (Peter Zhu)
* Status: Closed
* Backport: 3.1: WONTFIX, 3.2: WONTFIX, 3.3: DONE
----------------------------------------
GitHub PR: https://github.com/ruby/ruby/pull/9411
Both copy_compare_by_id and hash_copy will create a copy of the ST table, so the ST table created in copy_compare_by_id will be leaked.
```ruby
h = { 1 => 2 }.compare_by_identity
10.times do
1_000_000.times do
h.select { false }
end
puts `ps -o rss= -p #{$$}`
end
```
Before:
```
110736
204352
300272
395520
460704
476736
542000
604704
682624
770528
```
After:
```
15504
16048
16144
16256
16320
16320
16752
16752
16752
16752
```
--
https://bugs.ruby-lang.org/
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