Patch Name: PHKL_25032

Patch Description: s700_800 11.04 (VVOS) fix for large PT_MMAP pregions

Creation Date: 01/08/29

Post Date:  01/09/10

Hardware Platforms - OS Releases:
	s700: 11.04
	s800: 11.04

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_25032: HANG

Category Tags:
	defect_repair general_release critical halts_system

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_25032

Symptoms:
	PHKL_25032:
	ported HP-UX Patch PHKL_22807 to VVOS

	Based upon PHKL_22807:
	( SR:8606165948 CR:JAGad35235 )
	fork() of processes with large PT_MMAP pregions takes
	excessively long.  This can cause one processor to appear
	hung or if the system is a ServiceGuard node, it can
	result in a node TOC by cmcld with a stack trace similar to
	the one below:

	crash event was a TOC
	Send_Monarch_TOC+0x24
	safety_time_check+0x150
	per_spu_hardclock+0x350
	clock_int+0x5f4
	inttr_emulate_save_fpu+0x100
	pdv_refget2_0+0x1d4
	pdrefget2_0+0xa0
	hdl_getbits+0x190
	do_dupc+0x1e4
	for_val2+0x2c0
	for_val2+0x150
	for_val2+0x150
	foreach_chunk+0x3c
	dupreg+0x11c
	private_copy+0x60
	dupvas+0x210
	procdup+0x4c
	newproc+0x238
	fork1+0x1dc
	fork+0x10
	syscall+0x1c8
	$syscallrtn+0x0

Defect Description:
	PHKL_25032:
	Ported HP-UX Patch PHKL_22807 to VVOS.

	Based upon PHKL_22807:
	( SR:8606165948 CR:JAGad35235 )
	The function do_dupc(), that is called during a fork()
	system call, attempts to determine if a page has been
	modified.  Each superpage that exists in a process with
	large PT_MMAP pregions must have each of the 4K subpages
	it contains checked to determine the modified status of
	the entire superpage.  This process of checking the
	status of each subpage of a superpage is time consuming.

	Resolution:
	The value of the modified status of the base page frame
	number of the superpage is saved and used as the modified
	status of the entire superpage.  This eliminates the need
	to check the status of each subpage.

SR:
	8606165948

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	/usr/conf/lib/libhp-ux.a(vm_region.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(vm_region.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	/usr/conf/lib/libhp-ux.a(vm_region.o):
		vm_region.c $Date: 2000/11/22 12:25:50 $Revision: r1
			1ros/4 PATCH_11.00 (PHKL_22807)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(vm_region.o):
		vm_region.c $Date: 2000/11/22 12:25:50 $Revision: r1
			1ros/4 PATCH_11.00 (PHKL_22807)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	374636060 9180 /usr/conf/lib/libhp-ux.a(vm_region.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	657209871 17264 /usr/conf/lib/libhp-ux.a(vm_region.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 11.04: PHKL_19142
	s800: 11.04: PHKL_19142

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 60 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_25032

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_25032.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_25032.  If you do not wish to retain a
	copy of the original software, use the patch_save_files option:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -x patch_save_files=false -s /tmp/PHKL_25032.depot

	WARNING: If patch_save_files is false when a patch is installed,
		 the patch cannot be deinstalled.  Please be careful
		 when using this feature.

	For future reference, the contents of the PHKL_25032.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_25032.depot

	To put this patch on a magnetic tape and install from the
	tape drive, use the command:

		dd if=/tmp/PHKL_25032.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_19142
	For successful installation please insure that PHKL_19142
	is already installed, or that PHKL_19142 is included
	in the same depot with this patch and PHKL_19142
	is selected for installation.