Patch Name: PHCO_30441

Patch Description: s700_800 11.23 cumulative changes to umount command

Creation Date: 04/03/15

Post Date: 04/06/22

Hardware Platforms - OS Releases:
	s700: 11.23
	s800: 11.23

Products: N/A

Filesets:
	OS-Core.UX-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA/PA,v=HP
	OS-Core.UX2-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP

Automatic Reboot?: No

Status: General Release

Critical:
	Yes
	PHCO_30441: OTHER
		umount(2) command may fail.

Category Tags:
	defect_repair general_release critical

Path Name: /hp-ux_patches/s700_800/11.X/PHCO_30441

Symptoms:
	PHCO_30441:
	( SR:8606353134 CR:JAGaf13929 )
	'deletefrommtab failed.' or 'makereversetablelist failed.'

	These messages showed up while doing concurrent umount(2)s
	of 1130 file systems on a system with 48 GB of RAM.
	In each instance, the umount(2) of a file system failed.

	Circumventions:
	   Use fewer concurrent umount(2)s or do serial umount(2)s.
	   (via Service Guard feature.)

Defect Description:
	PHCO_30441:
	( SR:8606353134 CR:JAGaf13929 )
	umount(2) locks /etc/mnttab to do these operations.
	It will retry the lock operation N times at 1 second
	intervals before failing the operation.
	ie there is no 'backoff' to adapt to contention.

	Resolution:
	Use a sequential 'backoff' algorithm when there
	is contention for the /etc/mnttab lock.
	ie Retry N times at 1 second, 2 second, 3 second,
	etc, up to N second intervals.

Enhancement:
	No

SR:
	8606353134

Patch Files:
	
	OS-Core.UX-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA/PA,v=HP:
	/usr/sbin/umount

	OS-Core.UX2-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP:
	/sbin/umount

what(1) Output:
	
	OS-Core.UX-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA/PA,v=HP:
	/usr/sbin/umount:
		umount.c $Date: 2004/02/11 13:27:45 $Revision: r11.2
			3/1 PATCH_11.23 (PHCO_30441)
		$Revision: vw: -f    selectors: R11.23_BL2004_0315_3
			 PHCO_30441 'R11.23_BL2004_0315_3'
		Mon Mar 15 20:55:51 PST 2004 $

	OS-Core.UX2-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP:
	/sbin/umount:
		umount.c $Date: 2004/02/11 13:27:45 $Revision: r11.2
			3/1 PATCH_11.23 (PHCO_30441)
		$Revision: vw: -f    selectors: R11.23_BL2004_0315_3
			 PHCO_30441 'R11.23_BL2004_0315_3'
		Mon Mar 15 20:55:51 PST 2004 $

cksum(1) Output:
	
	OS-Core.UX-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA/PA,v=HP:
	1107899120 656516 /usr/sbin/umount

	OS-Core.UX2-CORE,fr=B.11.23,fa=HP-UX_B.11.23_IA,v=HP:
	1107899120 656516 /sbin/umount

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches: None

Patch Package Size: 240 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 PHCO_30441

	5. Run swinstall to install the patch:

		swinstall -x autoreboot=true -x patch_match_target=true \
			  -s /tmp/PHCO_30441.depot

	By default swinstall will archive the original software in 
	/var/adm/sw/save/PHCO_30441.  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 PHCO_30441.text file is 
	available in the product readme:

		swlist -l product -a readme -d @ /tmp/PHCO_30441.depot

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

		dd if=/tmp/PHCO_30441.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None