[ruby-core:86723] [Ruby trunk Bug#14716] SecureRandom throwing an error in Ruby 2.5.1

[snehavas@thoughtworks.com]

Issue #14716 has been updated by snehavas (sneha vasanth).


We checked that by executing 'cat /dev/urandom' and we did see an output.
So dont think thats an issue.

We suspect that this issue occurs when there are many concurrent requests.

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Bug #14716: SecureRandom throwing an error in Ruby 2.5.1
https://bugs.ruby-lang.org/issues/14716#change-71680

* Author: snehavas (sneha vasanth)
* Status: Open
* Priority: Normal
* Assignee: 
* Target version: 
* ruby -v: 2.5.1
* 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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