Patch Name: PHKL_26816

Patch Description: s700 10.26 PM fixes

Creation Date: 02/05/27

Post Date:  02/08/02

Hardware Platforms - OS Releases:
	s700: 10.26

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_26816: PANIC

Path Name: /hp-ux_patches/s700/10.X/PHKL_26816

Symptoms:
	PHKL_26816:
	Partial porting of 10.20 patch PHKL_21933 to TOS

	(PHKL_21933:)
	(SR: 8606139862   CR: JAGad09174)
	Possible data page fault panic related to internal thread
	manipulation.  Panic stack trace may vary.

	(PHKL_21516:)
	(SR: 8606131455   CR: JAGad00605)
	System panics with trap type 15, data page fault.  The
	stack may look like:
	resume_cleanup+0x378
	resume+0x280
	_swtch+0x138
	real_sleep+0x330
	_sleep_one+0x14
	netisr_daemon+0x194
	main+0x92c
	$vstart+0x34
	$locore+0x74

Defect Description:
	PHKL_26816:
	Partial porting of 10.20 patch PHKL_21933 to TOS

	(PHKL_21933:)
	(SR: 8606139862   CR: JAGad09174)
	Race condition when inserting a thread onto a sleep queue
	resulted in "ghosted" threads and pointers not correctly
	updated.
	Resolution:
	Modify insertion routine to place thread at the end of the
	queue if it is the lowest priority thread after walking the
	queue.  Update queue and thread pointers appropriately.

	(PHKL_21516:)
	(SR: 8606131455   CR: JAGad00605)
	Some routines used the value of the previous thread pointer
	without verifying that it was valid, resulting in a trap
	type 15 and a system panic.
	Resolution:
	We now verify that the previous thread pointer is valid
	before dereferencing it.

SR:
	8606131455 8606139862

Patch Files:
	/usr/conf/lib/libhp-ux.a(pm_swtch.o)
	/usr/conf/lib/libhp-ux.a(syscall.o)
	/usr/conf/lib/libhp-ux.a(trap.o)

what(1) Output:
	/usr/conf/lib/libhp-ux.a(pm_swtch.o):
		02/04/18 kern/sys/pm_swtch.c, hpux, hpux_10.26, ic5g
			s Revision 1.7 PATCH_10.26 (PHKL_26816)
	/usr/conf/lib/libhp-ux.a(syscall.o):
		None
	/usr/conf/lib/libhp-ux.a(trap.o):
		trap.c    $Date: 97/09/23 11:22:02 $ $Revision: 1.16
			9.98.14 $ PATCH_10.20 (PHKL_12662)

cksum(1) Output:
	1719753490 20864 /usr/conf/lib/libhp-ux.a(pm_swtch.o)
	4175818866 5568 /usr/conf/lib/libhp-ux.a(syscall.o)
	2832800047 24048 /usr/conf/lib/libhp-ux.a(trap.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_26817:
	s800: 10.26

Patch Package Size: 110 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_26816

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_26816.depot

	By default swinstall will archive the original software in
	/var/adm/sw/patch/PHKL_26816.  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_26816.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_26816.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None