Public bug reported:
-- 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
** Affects: ubuntu
Importance: Undecided
Status: New
** Tags: architecture-ppc64le bugnameltc-112970 severity-normal
** Tags added: architecture-ppc64le bugnameltc-112970 severity-normal
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https://bugs.launchpad.net/bugs/1337576
Title:
cron starts binary with /bin/sh
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