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------- Comment From lcguo@xxxxxxxxxx 2016-01-13 09:53 EDT-------
(In reply to comment #18)
It is a /bin/dash defect affecting all Ubuntu releases, and still remains everywhere:
root@Ubuntu1604:~# ps -ef | grep cat
root       1553   1527  0 08:45 tty1     00:00:00 /bin/dash -c cat
root       1554   1553  0 08:45 tty1     00:00:00 cat

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https://bugs.launchpad.net/bugs/1337576

Title:
  dash inability - cron starts binary with /bin/sh

Status in dash package in Ubuntu:
  New

Bug description:
  -- Problem Description --
  CRON uses shell to start a binary executable defined in crontab, which is a waste of the resources for the extra shell process hanging in the system. It's supposed to run it directly with exec system call.

  *** Here are some command outputs to see the extra process(12327) and relevant information: ***
  # ps -ef | grep -e CRON -e PMLnx
  root     12326   771  0 13:59 ?        00:00:00 CRON
  root     12327 12326  0 13:59 ?        00:00:00 /bin/sh -c /var/perf/pm/bin/daemon_PMLnx      <--- extra layer, a waste
  root     12328 12327  0 13:59 ?        00:00:00 /var/perf/pm/bin/daemon_PMLnx

  # crontab -l
  59 * * * * /var/perf/pm/bin/daemon_PMLnx

  # file /var/perf/pm/bin/daemon_PMLnx
  /var/perf/pm/bin/daemon_PMLnx: ELF 64-bit LSB  executable, 64-bit PowerPC or cisco 7500, version 1 (SYSV), dynamically linked (uses shared libs), for GNU/Linux 3.0.0, BuildID[sha1]=1761d6d97eabb4e52870cb517fe6bf457e5bf89e, stripped

  # uname -a
  Linux ubuntu 3.13.0-24-generic #46-Ubuntu SMP Thu Apr 10 19:09:21 UTC 2014 ppc64le ppc64le ppc64le GNU/Linux

  # dpkg -l cron
      Name  Version            Architecture  Description
  +++-=====-==================-=============-=========================
  ii  cron  3.0pl1-124ubuntu2  ppc64el       process scheduling daemon

  *** Expect cron to directly execute a binary like this ***
  # ps -ef | grep -e CRON -e PMLnx
  root      2293  2223  0 09:59 ?        00:00:00 /usr/sbin/CRON -n
  root      2294  2293  0 09:59 ?        00:00:00 /var/perf/pm/bin/daemon_PMLnx

  # uname -a
  Linux hulala 3.12.15-3-default #1 SMP Wed Apr 2 17:08:55 UTC 2014 (69c2ea8) ppc64le ppc64le ppc64le GNU/Linux

  # cat /etc/SuSE-release
  SUSE Linux Enterprise Server 12 (ppc64le)
  VERSION = 12
  PATCHLEVEL = 0

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