Issue #11400 has been updated by Bar Hofesh.


Further Testing show that this happens (less so) when Regexp is not used, as in IO.gets("\r\n\r\n")

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Bug #11400: IO.gets(/\x0d?\x0a\x0d?\x0a/, 4096) raises comparison of Fixnum with nil failed
https://bugs.ruby-lang.org/issues/11400#change-53582

* Author: Bar Hofesh
* Status: Open
* Priority: Normal
* Assignee: 
* ruby -v: ruby 2.2.1p85 (2015-02-26 revision 49769) [x86_64-linux]
* Backport: 2.0.0: UNKNOWN, 2.1: UNKNOWN, 2.2: UNKNOWN
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This is my code, "socket" is a SSLSocket this is why it allows a Regexp in gets

`begin
    http_response[:http_headers] = WEBrick::Utils.timeout(3){
      socket.gets(/\x0d?\x0a\x0d?\x0a/, 4096) #\r?\n\r?\n
    }
  rescue Errno::ECONNRESET
    return nil
  rescue Timeout::Error
    LOGGER_SYSLOG_SYSLOG.syslog_error('e', 'Timeout when reading aware')
  rescue Exception => e
    LOGGER_SYSLOG_SYSLOG.syslog_error('e', "Error Reading Aware: #{e}")
    retry unless socket.eof? || socket.closed?
  end`

The error reads like this: "Error Reading Aware: comparison of Fixnum with nil failed"
Which means it comes from this begin\rescue block, but there is nothing inside it which would compare a Fixnum with nil, so, I suspect that gets does it ? 



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