Patch Name: PHKL_15762 Patch Description: s700 10.01 timer_settime, alarm, nanosleep cumulative patch Creation Date: 98/06/29 Post Date: 98/06/29 Hardware Platforms - OS Releases: s700: 10.01 Products: N/A Filesets: OS-Core.CORE-KRN Automatic Reboot?: Yes Status: General Release Critical: Yes PHKL_15762: PANIC HANG PHKL_12112: PANIC HANG PHKL_11234: PANIC So far, the panic only appears on MP systems running the latest Informix release. Path Name: /hp-ux_patches/s700/10.X/PHKL_15762 Symptoms: PHKL_15762: System experiences intermittent hangs; in some cases the system is able to resume processing without intervention in about 20 minutes, but other times it will lock up and need to be TOC'ed. The event trace in the dump shows: crash event was a TOC timespecfix+0x0 timespecadd+0x30 ktimer_expire+0x24c invoke_callouts+0x160 softclock+0x38 sw_service+0x154 mp_ext_interrupt+0x2a0 PHKL_12968: timer_settime(2) does not set 10ms timer interval properly. The smallest interval can be set is 20ms. PHKL_12890: Applications relying on alarm() returning a number greater than zero will fail if there was time remaining on the cancelled alarm and were trying to re-schedule the original alarm. alarm() returns "zero" when cancelling a previous alarm() with an alarm pending. PHKL_12112: System hangs on UP systems or spinlock deadlocks on MP systems, when using nanosleep system call. If using signals which were to be ignored when in nanosleep() we were awaken eventhough we should not. Patch is especially critical as soon as newer libc patches are installed on the system too. The first releases of libc to be critical are PHCO_10384 for 10.10, PHCO_11004 for 10.20 and PHCO_10652 for 10.01. PHKL_11234: Panic on S800 MP systems using 10.01+ with latest Informix releases. Defect Description: PHKL_15762: In 10.X, setitimer() does not check for the validity of user arguments properly. When an application uses setitimer(2) with a negative interrupt timer value, it causes the kernel timer expiration routine to spin in a loop while holding the timer callout_lock. If any other process tries to grab the callout_lock at this time, it will result a spinlock deadlock panic. The fix is to check the validity of the arguments and return an EINVAL for negative values. PHKL_12968: A defect in the implementation of timer reload causes the 1 tick (10ms) interval be rounded to 2 ticks (20ms). PHKL_12890: alarm() rounds the time remaining to the nearest second so if the time remaining is less than 0.5 seconds, the result is rounded to zero. This makes it impossible to reschedule the original alarm. There was no check made in alarm() to determine if the result has been rounded to zero. The fix is to have a check to ensure that we never return zero if there was any time remaining. PHKL_12112: System hangs or panics when signal is received which has action set to ignore when in nanosleep system call. Libc patch that changed sleep()'s underlying system call to nanosleep() makes situation worse. PHKL_11234: Random S800 MP system panics when running the latest Informix because of a corner-case MP hole in nanosleep which is seen when nanosleep() is called from within a signal handler. SR: 5003360024 5003366500 5003385393 5003418244 Patch Files: /usr/conf/lib/libhp-ux.a(pm_timers.o) /usr/conf/lib/libhp-ux.a(subr_timers.o) what(1) Output: /usr/conf/lib/libhp-ux.a(pm_timers.o): pm_timers.c $Date: 98/06/29 10:09:56 $ $Revision: 1. 2.71.13 $ PATCH_10.01 (PHKL_15762) /usr/conf/lib/libhp-ux.a(subr_timers.o): subr_timers.c $Date: 97/10/22 10:54:32 $ $Revision: 1.2.71.20 $ PATCH_10.01 (PHKL_12968) cksum(1) Output: 657806207 6540 /usr/conf/lib/libhp-ux.a(pm_timers.o) 842772129 8952 /usr/conf/lib/libhp-ux.a(subr_timers.o) Patch Conflicts: None Patch Dependencies: None Hardware Dependencies: None Other Dependencies: None Supersedes: PHKL_11234 PHKL_12112 PHKL_12890 PHKL_12968 Equivalent Patches: PHKL_15763: s800: 10.01 PHKL_15764: s700: 10.10 PHKL_15765: s800: 10.10 Patch Package Size: 80 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 PHKL_15762 5a. For a standalone system, run swinstall to install the patch: swinstall -x autoreboot=true -x match_target=true \ -s /tmp/PHKL_15762.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/PHKL_15762.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/PHKL_15762. 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 PHKL_15762.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/PHKL_15762.depot of=/dev/rmt/0m bs=2k Special Installation Instructions: None