今天一同事报告Linux服务器上的crontab作业没有运行，检查/var/log/cron日志后发现下面错误信息
Jan 19 16:30:01 xxxx crond[31399]: Authentication token is no longer valid; new one required
Jan 19 16:30:01 xxxx crond[31400]: Authentication token is no longer valid; new one required
Jan 19 16:30:01 xxxx crond[31401]: Authentication token is no longer valid; new one required
Jan 19 16:30:01 xxxx crond[31398]: Authentication token is no longer valid; new one required
Jan 19 16:30:01 xxxx crond[31400]: CRON (oracle) ERROR: failed to open PAM security session: Success
Jan 19 16:30:01 xxxx crond[31400]: CRON (oracle) ERROR: cannot set security context
Jan 19 16:30:01 xxxx crond[31401]: CRON (oracle) ERROR: failed to open PAM security session: Success
Jan 19 16:30:01 xxxx crond[31401]: CRON (oracle) ERROR: cannot set security context
Jan 19 16:30:01 xxxx crond[31402]: Authentication token is no longer valid; new one required
Jan 19 16:30:01 xxxx crond[31398]: CRON (root) ERROR: failed to open PAM security session: Success
Jan 19 16:30:01 xxxx crond[31399]: CRON (oracle) ERROR: failed to open PAM security session: Success
Jan 19 16:30:01 xxxx crond[31402]: CRON (oracle) ERROR: failed to open PAM security session: Success
Jan 19 16:30:01 xxxx crond[31398]: CRON (root) ERROR: cannot set security context
Jan 19 16:30:01 xxxx crond[31399]: CRON (oracle) ERROR: cannot set security context
Jan 19 16:30:01 xxxx crond[31402]: CRON (oracle) ERROR: cannot set security context
Jan 19 16:35:01 xxxx crond[31431]: Authentication token is no longer valid; new one required
Jan 19 16:35:01 xxxx crond[31431]: CRON (oracle) ERROR: failed to open PAM security session: Success
Jan 19 16:35:01 xxxx crond[31431]: CRON (oracle) ERROR: cannot set security context