Patch Name: PHKL_24343

Patch Description: s700_800 11.11 Data Page Fault panic in DNLC

Creation Date: 01/06/26

Post Date:  01/08/07

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

Products: N/A

Filesets:
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP

Automatic Reboot?: Yes

Status: General Release

Critical:
	Yes
	PHKL_24343: PANIC

Category Tags:
	defect_repair general_release critical panic

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_24343

Symptoms:
	PHKL_24343:
	( SR:8606197344 CR:JAGad66537 )
	A Data Page Fault panic can occur if a small DNLC is
	configured.  This panic is unlikely to occur if a large
	DNLC has been configured. We were unable to produce this
	panic during internal testing on HP-UX 11.11, but code
	inspection shows it could possibly occur.

Defect Description:
	PHKL_24343:
	( SR:8606197344 CR:JAGad66537 )
	A Race condition between two threads accessing the same LRU
	chain of the DNLC simultaneously can cause a Data Page
	Fault. A LRU chain should never be empty; however, with a
	small DNLC (one entry per LRU chain) a race condition can
	occur where one thread can catch the LRU in a transient
	empty state while another thread has temporarily removed
	the single entry.

	Resolution:
	The thread which finds the LRU chain empty returns without
	performing any operations and allows the other thread to
	operate on the sole entry of this LRU chain.

SR:
	8606197344

Patch Files:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libfs.a(vfs_dnlc.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libfs.a(vfs_dnlc.o)

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libfs.a(vfs_dnlc.o):
		vfs_dnlc.c $Date: 2001/06/05 08:28:22 $Revision: r11
			.11/1 PATCH_11.11 (PHKL_24343)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libfs.a(vfs_dnlc.o):
		vfs_dnlc.c $Date: 2001/06/05 08:28:22 $Revision: r11
			.11/1 PATCH_11.11 (PHKL_24343)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	594618592 11672 /usr/conf/lib/libfs.a(vfs_dnlc.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	1964651661 33848 /usr/conf/lib/libfs.a(vfs_dnlc.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_24266:
	s700: 11.00
	s800: 11.00

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_24343

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_24343.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_24343.  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_24343.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_24343.depot

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

		dd if=/tmp/PHKL_24343.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None