Patch Name: PHKL_24026

Patch Description: s700_800 11.11 JFS Filesystem swap corruption

Creation Date: 01/04/27

Post Date:  01/08/02

Hardware Platforms - OS Releases:
	s700: 11.11
	s800: 11.11

Products: N/A

Filesets:
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_24026: PANIC CORRUPTION HANG
		This patch is needed only if filesystem swap is
		used on a JFS filesystem.

Category Tags:
	defect_repair general_release critical panic halts_system
	corruption

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_24026

Symptoms:
	PHKL_24026:
	( SR:8606193891 CR:JAGad63101 )
	Using filesystem swap with VxFS corrupts the filesystem.
	This may cause the system to hang or panic. There is no
	common stack trace and panic string for reference, but the
	filesystem which is used for swap may be corrupted and
	unrecoverable.

Defect Description:
	PHKL_24026:
	( SR:8606193891 CR:JAGad63101 )
	JFS uses a new flag to determine whether a vnode is
	used for swap files. If this flag is not set correctly,
	swap files are written to wrong locations on the disk
	causing filesystem corruption. Later, when swapped pages
	are paged in, the data may be corrupt which may lead to
	unpredictable results like system hangs or panics.

	Resolution:
	Make sure that the flag which determines whether a vnode
	is a swap file or not is set correctly on swap file vnodes.

SR:
	8606193891

Patch Files:
	
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvxfs.a(vx_swap.o)

	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvxfs.a(vx_swap.o)

what(1) Output:
	
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libvxfs.a(vx_swap.o):
		vx_swap.c $Date: 2001/04/27 12:08:36 $Revision: r11.
			11/1 PATCH_11.11 (PHKL_24026)

	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libvxfs.a(vx_swap.o):
		vx_swap.c $Date: 2001/04/27 12:08:36 $Revision: r11.
			11/1 PATCH_11.11 (PHKL_24026)

cksum(1) Output:
	
	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	1895402174 3496 /usr/conf/lib/libvxfs.a(vx_swap.o)

	JFS.VXFS-BASE-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	3314428063 6656 /usr/conf/lib/libvxfs.a(vx_swap.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_23940:
	s700: 11.00
	s800: 11.00

Patch Package Size: 40 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_24026

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_24026.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_24026.  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_24026.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_24026.depot

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

		dd if=/tmp/PHKL_24026.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None