Patch Name: PHKL_16209

Patch Description: s700_800 11.00 fix race conditions in UP emulation

Creation Date: 98/08/26

Post Date:  98/08/28

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_16209: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_16209

Symptoms:
	PHKL_16209:
	The system displays the message:

	   panic: requeue_to_pool: Frame still in use

	and panics.

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

Defect Description:
	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.

	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.11.00,fa=HP-UX_B.11.00_32,v=HP:
	/usr/conf/lib/libhp-ux.a(ios_msgs.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	/usr/conf/lib/libhp-ux.a(ios_msgs.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(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.11.00,fa=HP-UX_B.11.00_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.11.00,fa=HP-UX_B.11.00_32,v=HP:
	1120177813 13924 /usr/conf/lib/libhp-ux.a(ios_msgs.o)

	OS-Core.CORE2-KRN,fr=B.11.00,fa=HP-UX_B.11.00_64,v=HP:
	839105579 36944 /usr/conf/lib/libhp-ux.a(ios_msgs.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_15642 

Equivalent Patches: None

Patch Package Size: 70 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_16209

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_16209.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_16209.  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_16209.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_16209.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_16209.depot

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

		dd if=/tmp/PHKL_16209.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None