Patch Name: PHKL_24188

Patch Description: s700_800 11.11 hang in HFS

Creation Date: 01/06/22

Post Date:  01/08/02

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_24188: HANG

Category Tags:
	defect_repair general_release critical halts_system

Path Name: /hp-ux_patches/s700_800/11.X/PHKL_24188

Symptoms:
	PHKL_24188:
	( SR:8606195340 CR:JAGad64544 )
	A hang can occur in HFS due to a deadlock between two
	threads operating in the same directory.

Defect Description:
	PHKL_24188:
	( SR:8606195340 CR:JAGad64544 )
	The thread deadlock results when two threads perform the
	following actions:

	The first thread is in open() and has locked the directory
	inode in dirlook_loop(). Then it calls dnlc_purge1()
	because there are no inodes on the inode free list which
	subsequently causes the first thread to sleep waiting to
	lock the device vnode.

	The second thread is doing a mv of a file in the same
	directory as the first thread and is in a rename() system
	call. It locks the device vnode in ufs_rename() and
	proceeds to sleep waiting for the directory inode
	held by the first thread.

	Resolution:
	Avoid calling dnlc_purge1() in the open() path by verifying
	the status of inode freelist as soon as we lock the
	directory inode. If the free list is empty, purge and
	recover inodes at this point. This will avoid calling
	dnlc_purge1() further down the open() path.

SR:
	8606195340

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

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

what(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	/usr/conf/lib/libufs.a(ufs_dir.o):
		ufs_dir.c $Date: 2001/05/22 09:24:23 $Revision: r11.
			11/1 PATCH_11.11 (PHKL_24188)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	/usr/conf/lib/libufs.a(ufs_dir.o):
		ufs_dir.c $Date: 2001/05/22 09:24:23 $Revision: r11.
			11/1 PATCH_11.11 (PHKL_24188)

cksum(1) Output:
	
	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_32,v=HP:
	3068414711 21000 /usr/conf/lib/libufs.a(ufs_dir.o)

	OS-Core.CORE2-KRN,fr=B.11.11,fa=HP-UX_B.11.11_64,v=HP:
	1102321183 42752 /usr/conf/lib/libufs.a(ufs_dir.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_24117:
	s700: 11.00
	s800: 11.00

Patch Package Size: 90 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_24188

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHKL_24188.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHKL_24188.  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_24188.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHKL_24188.depot

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

		dd if=/tmp/PHKL_24188.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None