Patch Name: PHKL_26318

Patch Description: s700_800 11.00 Instruction fault panic with debugged thread

Creation Date: 02/04/15

Post Date:  02/04/18

Hardware Platforms - OS Releases:
	s700: 11.00
	s800: 11.00

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_26318: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_26318

Symptoms:
	PHKL_26318:
	( SR:8606207548 CR:JAGad76724 )
	While using a debugger to trace an application which is
	performing a vfork, there is a very slight chance to cause
	an instruction page fault panic.

Defect Description:
	PHKL_26318:
	( SR:8606207548 CR:JAGad76724 )
	A rare, corner case timing issue when a debug thread
	context switches during a fork/vfork operation may cause
	stack corruption and the subsequent instruction page fault
	panic upon resumption.

	It is very rare that a debug thread will manage to get into
	the fork/vfork/context switch combination that results in
	stack corruption.  It was encountered only in very
	intensive HP-internal system testing.  HP knows of no
	customer encountering this problem.

	Resolution:
	The context switch code was modified to correctly handle
	this corner case and prevent any stack corruption.

SR:
	8606207548

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP:
	/usr/conf/lib/libhp-ux.a(resume.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	/usr/conf/lib/libhp-ux.a(resume.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP:
	/usr/conf/lib/libhp-ux.a(resume.o):
		resume.s $Date: 2002/02/08 10:31:10 $Revision: r11ro
			s/5 PATCH_11.00 (PHKL_26318)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	/usr/conf/lib/libhp-ux.a(resume.o):
		resume.s $Date: 2002/02/08 10:31:10 $Revision: r11ro
			s/5 PATCH_11.00 (PHKL_26318)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_32,v=HP:
	2823549108 3912 /usr/conf/lib/libhp-ux.a(resume.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	618657881 4920 /usr/conf/lib/libhp-ux.a(resume.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 11.00: PHKL_18543
	s800: 11.00: PHKL_18543

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 30 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_26318

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_26318.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_26318.  If you do not wish to retain a
	copy of the original software, include the patch_save_files
	option in the swinstall command above:

		-x patch_save_files=false

	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_26318.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_26318.depot

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

		dd if=/tmp/PHKL_26318.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_18543.
	For successful installation please insure that PHKL_18543
	is already installed, or that PHKL_18543 is included
	in the same depot with this patch and PHKL_18543
	is selected for installation.