From: merch-redmine@...
Date: 2021-06-16T20:12:15+00:00
Subject: [ruby-core:104321] [Ruby master Bug#15779] After NoMemoryError, ruby freezes and takes 100% CPU

Issue #15779 has been updated by jeremyevans0 (Jeremy Evans).


This is still an issue in the master branch.  I've submitted a pull request for it: https://github.com/ruby/ruby/pull/4577.  The pull request uses @wanabe's fix and a test based on @buzztaiki's example.

----------------------------------------
Bug #15779: After NoMemoryError, ruby freezes and takes 100% CPU
https://bugs.ruby-lang.org/issues/15779#change-92544

* Author: buzztaiki (Taiki Sugawara)
* Status: Open
* Priority: Normal
* ruby -v: ruby 2.6.2p47 (2019-03-13 revision 67232) [x86_64-linux]
* Backport: 2.4: UNKNOWN, 2.5: UNKNOWN, 2.6: UNKNOWN
----------------------------------------
Run following reproduce code, ruby freezes and takes 100% CPU.

```
require 'open-uri'

begin
  "a" * 10000000000
ensure
  p open('https://www.ruby-lang.org/')
end
```

But interestingly, the following code does not reproduce this issue.

```
require 'open-uri'

begin
  begin
    "a" * 10000000000
  rescue NoMemoryError
    raise
  end
ensure
  p open('https://www.ruby-lang.org/')
end
```

It was also reproduced when put `sleep 100` in ensure clause, run it and hit Ctrl-C. But `puts 'XXX'` does not reproduce it.


---Files--------------------------------
strace.txt (377 KB)


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