cron问题？没有原因:crond任务竟然变掉了,我发了部分cron的日志，请大家帮我分析?

nergp

cron的日志:
Nov 17 14:56:20 localhost crontab[4438]: (root) REPLACE (root)
Nov 17 14:57:01 localhost crond[2186]: (tmp.24046) ORPHAN (no passwd entry)
Nov 17 14:57:01 localhost crond[2186]: (tmp.24776) ORPHAN (no passwd entry)
v 17 14:56:20 localhost crontab[4438]: (root) REPLACE (root)
Nov 17 14:57:01 localhost crond[2186]: (tmp.3399) ORPHAN (no passwd entry)
Nov 17 14:57:01 localhost crond[2186]: (root) RELOAD (cron/root)
Nov 17 14:57:01 localhost crond[2186]: (tmp.20804) ORPHAN (no passwd entry)
Nov 17 14:57:01 localhost crond[2186]: (tmp.24046) ORPHAN (no passwd entry)
Nov 17 14:57:01 localhost crond[2186]: (tmp.24776) ORPHAN (no passwd entry)
Nov 17 15:01:01 localhost crond[4517]: (root) CMD (run-parts /etc/cron.hourly)
Nov 17 15:04:35 localhost crontab[4553]: (root) LIST (root)
Nov 17 16:01:01 localhost crond[4570]: (root) CMD (run-parts /etc/cron.hourly)
Nov 17 17:01:01 localhost crond[5288]: (root) CMD (run-parts /etc/cron.hourly)
Nov 17 18:01:01 localhost crond[5527]: (root) CMD (run-parts /etc/cron.hourly)
Nov 17 18:03:54 localhost crontab[5686]: (root) LIST (root)
Nov 17 18:05:43 localhost crontab[5689]: (root) REPLACE (root)
Nov 17 18:05:49 localhost crontab[5690]: (root) LIST (root)

请问:下面的这２句是什么意思??
Nov 17 14:56:20 localhost crontab[4438]: (root) REPLACE (root)
Nov 17 14:57:01 localhost crond[2186]: (tmp.24046) ORPHAN (no passwd entry)