Red Hat Bugzilla – Bug 43430
CROND Hangs in Red Hat 7.1
Last modified: 2007-04-18 12:33:34 EDT
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Description of problem:
After a complete upgrade from Red Hat 7.0 to Red Hat 7.1 I noticed that
there are hung CROND processes. This only happened after the upgrade, and
presists. This was discovered by unusual load averages on a system that
has always had a load average of 0, and now has 10, and increasing.
ps -ef |grep -i cron procudes
[ahnoyd@superman ahnoyd]$ ps -ef|grep -i cron
root 531 1 0 Jun01 ? 00:00:00 crond
root 1583 531 0 Jun01 ? 00:00:00 CROND
root 1585 1583 0 Jun01 ? 00:00:00 CROND
root 778 531 0 Jun02 ? 00:00:00 CROND
root 18465 531 0 Jun03 ? 00:00:00 CROND
root 18466 18465 0 Jun03 ? 00:00:00 CROND
root 5965 531 0 06:00 ? 00:00:00 CROND
root 5968 5965 0 06:00 ? 00:00:00 CROND
ahnoyd 25772 25739 0 17:52 pts/0 00:00:00 grep -i cron
At a least hung state. There was a machine with 30 hung CRONDs sleeping.
/var/log/cron & /var/log/cron.1 matched the PIDs for the hung CRONDs.
We were albe to determine that our commands, and programs have executed and
completed in a ``normal'' state.
The only other oddity I was able to see was
awk -v progname=/etc/cron.hourly running for a long time on our new 7.1
Is there something amiss with cron?
Steps to Reproduce:
1. add cron entries ton crontab -e
2. wait a day or so "watch load averages"
3. ps -ef | grep -i crond
Actual Results: you will notice mutiple hung CROND processes.
Expected Results: only one crond process or so.
The only change to our systems was the RH 7.1 full upgrade.