Patch Name: PHKL_18932

Patch Description: s700_800 11.04 (VVOS) fix race conditions in UP emulation

Creation Date: 99/06/18

Post Date:  99/11/10

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_18932: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_18932

Symptoms:
	PHKL_18932:
	Ported HP-UX patch PHKL_16209 for VVOS.

	Based on PHKL_16209:
	The system displays the message:

	   panic: requeue_to_pool: Frame still in use

	and panics.

	Based on PHKL_15642:
	The most visible symptom was a panic; in other cases,
	invalid EIO errors were being returned.

Defect Description:
	PHKL_18932:
	Ported HP-UX patch PHKL_16209 for VVOS.

	Resolution:
	Ported HP-UX patch PHKL_16209.

	Based on PHKL_16209:
	Three more race conditions have been found in the UP
	emulation code.  One of these, which causes a panic in
	requeue_to_pool, was encountered when testing a driver
	currently under development.  The other two were found by
	code inspection.

	Based on PHKL_15642:
	There were 3 different race exposures in the UP emulation
	code where global data was being interrogated then locked
	and changed then unlocked.  However, the lock needed to be
	held across interrogating and changing the data.

	The LVM ioblast test reproduces the problem quite nicely.

SR:
	4701386672 4701399295

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(ios_msgs.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(ios_msgs.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(ios_msgs.o):
		ios_msgs.c $Date: 1998/08/18 13:38:23 $Revision: r11
			ros/4 PATCH_11.00 (PHKL_16209)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	/usr/conf/lib/libhp-ux.a(ios_msgs.o):
		ios_msgs.c $Date: 1998/08/18 13:38:23 $Revision: r11
			ros/4 PATCH_11.00 (PHKL_16209)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_32,v=HP:
	3190229596 13844 /usr/conf/lib/libhp-ux.a(ios_msgs.o)

	OS-Core.CORE2-KRN,fr=B.11.04,fa=HP-UX_B.11.04_64,v=HP:
	537339638 36984 /usr/conf/lib/libhp-ux.a(ios_msgs.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_16209:
	s700: 11.00
	s800: 11.00

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_18932

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_18932.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_18932.  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_18932.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_18932.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_18932.depot

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

		dd if=/tmp/PHKL_18932.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None