Patch Name: PHCO_16874

Patch Description: s700_800 10.20 umount(1M) cumulative patch

Creation Date: 98/12/17

Post Date:  98/12/22

Hardware Platforms - OS Releases:
	s700: 10.20
	s800: 10.20

Products: N/A

Filesets:
	OS-Core.UX-CORE

Automatic Reboot?: No

Status: General Release

Critical: No

Path Name: /hp-ux_patches/s700_800/10.X/PHCO_16874

Symptoms:
	PHCO_16874:
	Concurrent mounts/unmounts may cause mount(1M)/umount(1M)
	to fail with:  "mount: file system table may be corrupt".

	PHCO_15342:
	No visible symptoms.

	PHCO_13849:
	This patch is part of the 10.20 ACE 2 bundle
	which adds networking enhancements to 10.20.
	New networking features supported in ACE 2
	include NFS Version 3.0, AutoFS, and CacheFS.

Defect Description:
	PHCO_16874:
	The libc routines that access /etc/mnttab need to change so
	that they no longer lock on read; they must only lock on
	write.  In cooperation with libc changes, the umount(1M)
	command needs some integrity checks when it reads
	/etc/mnttab, to help compensate for not having the read
	lock.  This prevents umount(1M) from using an out-of-date
	/etc/mnttab file, or from using a corrupt or empty file and
	failing with, "umount: file system table may be corrupt".
	In addition, umount(1M) needs to change the way it updates
	/etc/mnttab, so that write-locking is minimized; it must
	use the new delmntent(3C) routine. All these changes help
	reduce the possibility of a deadlock situation, especially
	in HA environments, where multiple processes may be
	attempting to access and/or update /etc/mnttab at the same
	time.

	PHCO_15342:
	Remove fileset-level checkinstall script added for ONC+
	Networking Enhancements bundle to avoid manufacturing
	conflicts.

	PHCO_13849:
	New functionality to support networking features
	in 10.20.

SR:
	1653270181 4701378117

Patch Files:
	/sbin/umount

what(1) Output:
	/sbin/umount:
		$Revision: 78.4.1.2 $
		libcteam_nightly_dav,981025_20:00 libc.a_ID@@/main/r
			10dav/libc_dav/libc_dav_cpe/cup_libcteam_nig
			htly_dav/1
		/ux/core/libs/libc/archive_pa1/libc.a_ID
		Oct 25 1998 20:08:07
		PATCH_10_20: umount.o 98/12/17

cksum(1) Output:
	2872415196 143360 /sbin/umount

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHCO_13849 PHCO_15342

Equivalent Patches: None

Patch Package Size: 200 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_16874

	5a. For a standalone system, run swinstall to install the
	    patch:

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHCO_16874.depot

	5b. For a homogeneous NFS Diskless cluster run swcluster on the
	    server to install the patch on the server and the clients:

		swcluster -i -b

	    This will invoke swcluster in the interactive mode and
	    force all clients to be shut down.

	    WARNING: All cluster clients must be shut down prior to the
		     patch installation.  Installing the patch while the
		     clients are booted is unsupported and can lead to
		     serious problems.

	    The swcluster command will invoke an swinstall session in which
	    you must specify:

		alternate root path  -  default is /export/shared_root/OS_700
		source depot path    -  /tmp/PHCO_16874.depot

	    To complete the installation, select the patch by choosing
	    "Actions -> Match What Target Has" and then "Actions -> Install"
	    from the Menubar.

	5c. For a heterogeneous NFS Diskless cluster:

		- run swinstall on the server as in step 5a to install
		  the patch on the cluster server.

		- run swcluster on the server as in step 5b to install
		  the patch on the cluster clients.

	By default swinstall will archive the original software in
	/var/adm/sw/patch/PHCO_16874.  If you do not wish to retain a
	copy of the original software, you can create an empty file
	named /var/adm/sw/patch/PATCH_NOSAVE.

	Warning: If this file exists when a patch is installed, the
	         patch cannot be deinstalled.  Please be careful
		 when using this feature.

	It is recommended that you move the PHCO_16874.text file to
	/var/adm/sw/patch for future reference.

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

		dd if=/tmp/PHCO_16874.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None