Issue #14716 has been updated by emiltin (Emil Tin).


I got this when running a ruby script that openened a large number of TCP socket (and thus files). In fact I had to increase the file limit of the shell using ulimit to be able to open enough sockets.

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Bug #14716: SecureRandom throwing an error in Ruby 2.5.1
https://bugs.ruby-lang.org/issues/14716#change-81290

* Author: snehavas (sneha vasanth)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.6.3
* Backport: 2.3: DONTNEED, 2.4: DONTNEED, 2.5: REQUIRED
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Hi,

We recently upgraded from ruby 2.3.6 to 2.5.1.
We use SecureRandom.uuid to generate a random number for our session.
Post the upgrade we have been getting the following error intermittently

```
app error: failed to get urandom (RuntimeError)
E, [2018-04-27T04:55:08.741859 #16550] ERROR -- : /usr/lib/ruby/2.5.0/securerandom.rb:99:in `urandom'
E, [2018-04-27T04:55:08.741898 #16550] ERROR -- : /usr/lib/ruby/2.5.0/securerandom.rb:99:in `gen_random_urandom'
E, [2018-04-27T04:55:08.741932 #16550] ERROR -- : /usr/lib/ruby/2.5.0/securerandom.rb:129:in `random_bytes'
E, [2018-04-27T04:55:08.741965 #16550] ERROR -- : /usr/lib/ruby/2.5.0/securerandom.rb:219:in `uuid'
E, [2018-04-27T04:55:08.741997 #16550] ERROR -- : /usr/share/nginx/frontend/app/utilities/log.rb:74:in `create_session_info'
E, [2018-04-27T04:55:08.742036 #16550] ERROR -- : /usr/share/nginx/frontend/app/utilities/log.rb:11:in `context'
```

We understand that there was a change in ruby 2.5.1 where we now look at OS sources as the first point of contact to generate random numbers as opposed to OpenSSL.
Any idea why this could be happening?







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