[Bug 1511118] [NEW] 100% cpu usage with unresolved name server

[Lefteris Nikoltsios]

Public bug reported:

Description:	Ubuntu 15.10
Release:	15.10

Package Info:
==========
socat:
  Installed: 1.7.3.0-1
  Candidate: 1.7.3.0-1
  Version table:
 *** 1.7.3.0-1 0
        500 http://gr.archive.ubuntu.com/ubuntu/ wily/universe i386 Packages
        100 /var/lib/dpkg/status

[Impact]
At Ubuntu Wily OS, when we use the socat with a nameserver which is not defined at /etc/hosts and is unknown, the system hits 100% cpu usage. Additional, to terminate the process you must give -9 parameter in kill command.  Ctrl+C does not terminate the process.

With older versions of socat (< 1.7.3.0 upstream) the system does not
drive up to 100% cpu usage, but prints appropriate error message.

[Test case]
* A simple test to validate the issue, is to execute the below command:
socat tcp:server-local:789 - 
* Using older version of socat the above command will print:
socat[2756] E getaddrinfo("server-local", "(null)", {1,0,1,6}, {}): Name or service not known

[Regression Potential]
This bug affects the releases that use socat 1.7.3.0 upstream version (Wily, Xenial). The Vivid, Trusty and Precise are not affected.

** Affects: socat (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1511118

Title:
  100% cpu usage with unresolved name server

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