From: s.wanabe@...
Date: 2021-02-07T10:03:21+00:00
Subject: [ruby-core:102413] [Ruby master Bug#17587] Segmentation fault with ractors and unix signals

Issue #17587 has been updated by wanabe (_ wanabe).


The current behavior of stacking appears to be as expected.

The registered signal handler is called from the main thread. https://git.ruby-lang.org/ruby.git/tree/thread.c?id=947d93b715436b13eefa39f87737bdad3c1f870a#n2430
`Ractor.yield` in the main thread must cause stuck because there are no Ractor to take it in parallel.
In addition, signals are basically ignored in the signal handler, because of `interrupt_mask`. https://bugs.ruby-lang.org/issues/6009
For example, `Signal.trap("USR2") do sleep end; Process.kill(:USR2, $$)` can make ruby stuck.

I guess this is normal behavior that has nothing to do with Ractor.
(However, there is still room for consideration of safe behavior when a signal is received in a signal handler.)

----------------------------------------
Bug #17587: Segmentation fault with ractors and unix signals
https://bugs.ruby-lang.org/issues/17587#change-90285

* Author: mweitzel (Matthew Weitzel)
* Status: Open
* Priority: Normal
* Assignee: ko1 (Koichi Sasada)
* ruby -v: ruby 3.0.0p0 (2020-12-25 revision 95aff21468) [x86_64-darwin19] 
* Backport: 2.5: UNKNOWN, 2.6: UNKNOWN, 2.7: UNKNOWN, 3.0: UNKNOWN
----------------------------------------
Segmentation fault when trapping signals and using a Ractor.


Can be reproduced by running the following
``` ruby
Ractor.new do
  Signal.trap('INT') do
    Ractor.yield("yoo hoO! big summer blowout")
  end
  `kill -2 #{$$}`
  `kill -2 #{$$}`
  `kill -2 #{$$}`
end.take
```

---Files--------------------------------
ruby_2021-01-27-135454_Matthews-MacBook-Air.crash (29.6 KB)


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