Patch Name: PHCO_16953 Patch Description: s700_800 10.0X Year 2000 cumulative cron/at/crontab patch Creation Date: 98/11/19 Post Date: 99/01/22 Warn: 99/02/12 - This Critical Warning has been issued by HP. The /sbin/cron process that is running immediately after the installation or removal of this patch may cause certain jobs initiated by cron(1M) to hang. This is known to affect cron jobs using the fbackup(1M) command. The problem will only occur when the patch is installed or removed in a swinstall(1M) or swremove(1M) session that does *not* cause the system to be rebooted. During the installation and removal of this patch, cron(1M) is started by the postinstall and postremove scripts. This invocation of cron(1M) will not allow certain types of commands, like fbackup(1M), to complete successfully. Once cron(1M) is restarted via a system reboot or manual invocation, the problem will not be experienced. To avoid this problem, it is recommended that cron(1M) be restarted immediately following the installation and removal of the patch. This can be accomplished either via a system reboot or by killing and restarting cron(1M). Please note that it will be necessary to use the SIGKILL signal (signal 9) to kill cron: 1. kill -9 2. /sbin/init.d/cron start Hardware Platforms - OS Releases: s700: 10.00 10.01 s800: 10.00 10.01 Products: N/A Filesets: OS-Core.CMDS-MIN Automatic Reboot?: No Status: General Superseded With Warnings Critical: No Path Name: /hp-ux_patches/s700_800/10.X/PHCO_16953 Symptoms: PHCO_16953: 1. On trusted systems, cron(1) has slower performance due to calling getspwent() when getspwnam() should have been used. 2. at(1) schedules jobs incorrectly relative to 28 February of non-leap years. 3. at(1) does not recognize year 00 (2000). When year is input as 00, at(1) exits with the error message - "bad date specification" PHCO_15228: Year diplayed in two digits PHCO_14058: 1. With libc patch installed, at dumps core. 2. at is not able to correctly schedule jobs for Feb 29 2000 PHCO_10735: Cron used to dump core and die when jobs submitted with at -m were killed. PHCO_10112: The following symtoms correspond to the descriptions in the defect descriptions field for PHCO_10112: 1. option -t now deal with year 2000 input correctly. 2. year limit has been increased from 2030 to 2037. PHCO_7997: 1. at(1) cannot schedule job using weekdays in the last week of the month. 2. cron does not mail stdout and stderr on trusted systems. 3. '.' not present in default PATH PHCO_6862: 1. Cron dumps core intermittently. 2. Cron has a hard-coded limit of MAXRUN (40) child processes which can be running simultaneously. Now the limit has been increased to 100. PHCO_6286: Cron is going into a loop using all available cpu several times a day. This happens intermittently when the system is heavily loaded. Defect Description: PHCO_16953: 1. On trusted systems, cron(1) called getspwent() which performs a linear search in the passwd database, instead of getspwnam() which performs a keyed search. 2. Jobs scheduled after 28 Feb are scheduled erratically by at(1). The following shows the incorrect behaviour of at(1). # date 0227112099 Sat Feb 27 11:20:00 GMT 1999 # at now + 2 day warning: commands will be executed using /usr/bin/sh job 920287223.a at Mon Mar 1 11:20:23 1999 # at now + 3 day warning: commands will be executed using /usr/bin/sh job 920287243.a at Mon Mar 1 11:20:43 1999 In the above example, job is scheduled for March 1st for both the inputs "now + 2 day" and "now + 3 day". For the input "now + 3 day", at(1) should have scheduled the job for March 2nd 1999. The source code has been changed to fix the defect. After the fix, at(1) correctly schedules jobs relative to Feb, 28th. In the above example, for input "now + 3 day", at(1) schedules the job for March 2nd. 3. at(1) treats year input of 00 as incorrect. Following shows how at(1) behaves with 00 as input year. # at 12:00 1 Jan 00 bad date specification The command has been changed to accept 00 as year 2000. After the fix, at(1) treats year input of 00 as year 2000 and does not show any error messages. PHCO_15228: Year displayed in two digits. PHCO_14058: The following defects are fixed in this patch: 1.With libc patch PHCO_12009 installed, at on 10.01 dumps core. 2.When using at to schedule a job 29 Feb 2000, the job actually gets scheduled for 1 Mar 2000. PHCO_10735: Cron used to dump core and die when jobs submitted with at -m were killed. PHCO_10112: The following symtoms correspond to the descriptions in the defect descriptions field for PHCO_10112: 1. option -t now deal with year 2000 input correctly. 2. year limit has been increased from 2030 to 2037. PHCO_7997: 1. at(1) cannot schedule job using weekdays in the last week of the month. 2. cron does not mail stdout and stderr on trusted systems. 3. '.' not present in default PATH PHCO_6862: 1. Cron dumps core intermittently. 2. Cron has a hard-coded limit of MAXRUN (40) child processes which can be running simultaneously. Now the limit has been increased to 100. PHCO_6286: Cron is going into a loop using all available cpu several times a day. This happens intermittently when the system is heavily loaded. SR: 1653274167 1653269746 1653266239 1653241117 1653215038 4701347153 Patch Files: /usr/sbin/cron /usr/bin/at /usr/bin/crontab what(1) Output: /usr/sbin/cron: $Revision: 74.5.3.14 $ PATCH/10_01 PHCO_7997 $Revision: 74.2.1.6 $ PATCH_10_00: hpux_rel.o cron.o funcs.o 98/11/19 /usr/bin/at: $Revision: 74.5.3.14 $ $Revision: 74.2.1.3 $ $Revision: 74.2.1.6 $ PATCH_10_00: hpux_rel.o at.o pdt.o ptime.o pdate.o f uncs.o permit.o 98/11/19 /usr/bin/crontab: $Revision: 74.5.3.14 $ PATCH_10_00: hpux_rel.o crontab.o permit.o funcs.o 9 8/11/19 cksum(1) Output: 2130750709 40960 /usr/sbin/cron 4027158778 45056 /usr/bin/at 4042688541 20480 /usr/bin/crontab Patch Conflicts: None Patch Dependencies: None Hardware Dependencies: None Other Dependencies: None Supersedes: PHCO_6286 PHCO_6862 PHCO_7997 PHCO_10112 PHCO_10735 PHCO_14058 PHCO_15228 Equivalent Patches: PHCO_16942: s700: 11.00 s800: 11.00 PHCO_16864: s700: 10.20 s800: 10.20 PHCO_16863: s700: 10.10 s800: 10.10 Patch Package Size: 160 KBytes Installation Instructions: Please review all instructions and the Hewlett-Packard SupportLine User Guide or your Hewlett-Packard support terms and conditions for precautions, scope of license, restrictions, and, limitation of liability and warranties, before installing this patch. ------------------------------------------------------------ 1. Back up your system before installing a patch. 2. Login as root. 3. Copy the patch to the /tmp directory. 4. Move to the /tmp directory and unshar the patch: cd /tmp sh PHCO_16953 5a. For a standalone system, run swinstall to install the patch: swinstall -x autoreboot=true -x match_target=true \ -s /tmp/PHCO_16953.depot 5b. For a homogeneous NFS Diskless cluster run swcluster on the server to install the patch on the server and the clients: swcluster -i -b This will invoke swcluster in the interactive mode and force all clients to be shut down. WARNING: All cluster clients must be shut down prior to the patch installation. Installing the patch while the clients are booted is unsupported and can lead to serious problems. The swcluster command will invoke an swinstall session in which you must specify: alternate root path - default is /export/shared_root/OS_700 source depot path - /tmp/PHCO_16953.depot To complete the installation, select the patch by choosing "Actions -> Match What Target Has" and then "Actions -> Install" from the Menubar. 5c. For a heterogeneous NFS Diskless cluster: - run swinstall on the server as in step 5a to install the patch on the cluster server. - run swcluster on the server as in step 5b to install the patch on the cluster clients. By default swinstall will archive the original software in /var/adm/sw/patch/PHCO_16953. If you do not wish to retain a copy of the original software, you can create an empty file named /var/adm/sw/patch/PATCH_NOSAVE. Warning: If this file exists when a patch is installed, the patch cannot be deinstalled. Please be careful when using this feature. It is recommended that you move the PHCO_16953.text file to /var/adm/sw/patch for future reference. To put this patch on a magnetic tape and install from the tape drive, use the command: dd if=/tmp/PHCO_16953.depot of=/dev/rmt/0m bs=2k Special Installation Instructions: The /sbin/cron process that is running immediately after the installation or removal of this patch may cause certain jobs initiated by cron(1M) to hang. This is known to affect cron jobs using the fbackup(1M) command. The problem will only occur when the patch is installed or removed in a swinstall(1M) or swremove(1M) session that does *not* cause the system to be rebooted. During the installation and removal of this patch, cron(1M) is started by the postinstall and postremove scripts. This invocation of cron(1M) will not allow certain types of commands, like fbackup(1M), to complete successfully. Once cron(1M) is restarted via a system reboot or manual invocation, the problem will not be experienced. To avoid this problem, it is recommended that cron(1M) be restarted immediately following the installation and removal of the patch. This can be accomplished either via a system reboot or by killing and restarting cron(1M). Please note that it will be necessary to use the SIGKILL signal (signal 9) to kill cron: 1. kill -9 2. /sbin/init.d/cron start