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From: "peterzhu2118 (Peter Zhu) via ruby-core" <ruby-core@ml.ruby-lang.org>
To: ruby-core@ml.ruby-lang.org
Cc: "peterzhu2118 (Peter Zhu)" <noreply@ruby-lang.org>
Subject: [ruby-core:118680] [Ruby master Bug#20650] Memory leak in Regexp capture group when timeout
Date: Wed, 24 Jul 2024 19:19:48 +0000 (UTC)	[thread overview]
Message-ID: <redmine.issue-20650.20240724191948.42491@ruby-lang.org> (raw)
In-Reply-To: <redmine.issue-20650.20240724191948.42491@ruby-lang.org>

Issue #20650 has been reported by peterzhu2118 (Peter Zhu).

----------------------------------------
Bug #20650: Memory leak in Regexp capture group when timeout
https://bugs.ruby-lang.org/issues/20650

* Author: peterzhu2118 (Peter Zhu)
* Status: Open
* Backport: 3.1: UNKNOWN, 3.2: REQUIRED, 3.3: REQUIRED
----------------------------------------
GitHub PR: https://github.com/ruby/ruby/pull/11238

The capture group allocates memory that is leaked when it times out.

For example:

```ruby
re = Regexp.new("^#{"(a*)" * 10_000}x$", timeout: 0.000001)
str = "a" * 1000000 + "x"

10.times do
  100.times do
    re =~ str
  rescue Regexp::TimeoutError
  end

  puts `ps -o rss= -p #{$$}`
end
```

Before:

```
34688
56416
78288
100368
120784
140704
161904
183568
204320
224800
```

After:

```
16288
16288
16880
16896
16912
16928
16944
17184
17184
17200
```



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       reply	other threads:[~2024-07-24 19:20 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-07-24 19:19 peterzhu2118 (Peter Zhu) via ruby-core [this message]
2024-07-25 13:54 ` [ruby-core:118684] " peterzhu2118 (Peter Zhu) via ruby-core

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