Patch Name: PHKL_12112

Patch Description: s700 10.01 nanosleep fix for MP hole and early wakeup

Creation Date: 97/08/13

Post Date:  97/08/19

Hardware Platforms - OS Releases:
	s700: 10.01

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Superseded

Critical:
	Yes
	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_12112

Symptoms:
	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_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

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: 97/08/13 12:15:38 $ $Revision: 1.
			2.71.11 $ PATCH_10.01 (PHKL_12112)
	/usr/conf/lib/libhp-ux.a(subr_timers.o):
		subr_timers.c $Date: 97/08/13 12:19:37 $ $Revision:
			1.2.71.19 $ PATCH_10.01 (PHKL_12112)

cksum(1) Output:
	4236285942 6464 /usr/conf/lib/libhp-ux.a(pm_timers.o)
	2232301537 8584 /usr/conf/lib/libhp-ux.a(subr_timers.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_11234

Equivalent Patches:
	PHKL_12113:
	s800: 10.01

	PHKL_12108:
	s700: 10.10

	PHKL_12109:
	s800: 10.10

	PHKL_12110:
	s700: 10.20

	PHKL_12111:
	s800: 10.20

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_12112

	5a. For a standalone system, run swinstall to install the
	    patch:

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_12112.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_12112.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_12112.  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_12112.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_12112.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None