[Bug 1643084] Re: [REGRESSION] kill segfaults w/ single, negative PID

[dann frazier]

Addresses:
https://errors.ubuntu.com/problem/ca3851bccaed9924746cc8551188f9039c162093

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https://bugs.launchpad.net/bugs/1643084

Title:
  [REGRESSION] kill segfaults w/ single, negative PID

Status in procps package in Ubuntu:
  Fix Released
Status in procps source package in Xenial:
  In Progress

Bug description:
  [Impact]
  The kill binary will segfault when called w/ a single, negative PID. This breaks a use case where you maybe sending the default signal (SIGTERM) to all processes (-1) or all processes in a process group (-<PGID). This is regression introduced via an SRU to fix LP: #1637026.

  [Test Case]
  $ /bin/kill -9
  Segmentation fault (core dumped)

  [Regression Risk]
  This fix will now make our optparsing almost identical to current yakkety, for which I see no obvious regressions filed.

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