From: russell.davis@...
Date: 2017-09-19T01:43:35+00:00
Subject: [ruby-core:82853] [Ruby trunk Bug#13916] Race condition when sending a signal to a new fork

Issue #13916 has been reported by russelldavis (Russell Davis).

----------------------------------------
Bug #13916: Race condition when sending a signal to a new fork
https://bugs.ruby-lang.org/issues/13916

* Author: russelldavis (Russell Davis)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: ruby 2.4.1p111 (2017-03-22 revision 58053) [x86_64-darwin16]
* Backport: 2.2: UNKNOWN, 2.3: UNKNOWN, 2.4: UNKNOWN
----------------------------------------
To reproduce, run this script:

~~~ ruby
1_000_000.times do |i|
  pid = fork {sleep}
  puts pid
  Process.kill(:TERM, pid)
  Process.wait(pid)
end
~~~

Expected behavior: it should print a million pids and then exit.

Actual behavior: after some number of iterations, it freezes on the call to `Process.wait`, because the fork never got killed by the TERM signal. (I verified with `ps` that the pid it froze on is still running.)




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