Bug #19835: Parser leaks memory for incomplete tokens

• Status: Closed
• Assignee: -
• Target version: -
• Backport: 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE

[peterzhu2118 (Peter Zhu)]

GitHub Pull Request: https://github.com/ruby/ruby/pull/8192

The parser does not free the tbl of the struct vtable when there are leftover lvtbl in the parser. This causes a memory leak.

The following script reproduces this issue:

10.times do
  100_000.times do
    Ripper.parse("class Foo")
  end

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

[peterzhu2118 (Peter Zhu)]

• Status changed from Open to Closed

Applied in changeset git|5bc8fceca8d47ed1ef9c603c6531a408de36b60c.

---

Fix memory leak in parser for incomplete tokens

[Bug #19835]

The parser does not free the tbl of the struct vtable when there are
leftover lvtbl in the parser. This causes a memory leak.

The following script reproduces this issue:

10.times do
  100_000.times do
    Ripper.parse("class Foo")
  end

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

[nagachika (Tomoyuki Chikanaga)]

• Backport changed from 3.0: REQUIRED, 3.1: REQUIRED, 3.2: REQUIRED to 3.0: REQUIRED, 3.1: REQUIRED, 3.2: DONE

ruby_3_2 6898389a0f640c4155a7073579f43d1e16893698 merged revision(s) 5bc8fceca8d47ed1ef9c603c6531a408de36b60c.

[nobu (Nobuyoshi Nakada)]

• Related to Bug #20521: Memory leak in Ripper parsing added