Patch Name: PHKL_17059

Patch Description: s700 10.20 proc_open synchronization fixes

Creation Date: 99/01/14

Post Date:  99/01/19

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Release

Critical:
	No (superseded patches were critical)
	PHKL_13011: PANIC

Path Name: /hp-ux_patches/s700/10.X/PHKL_17059

Symptoms:
	PHKL_17059:
	Allbase frequently sees the following errors while using
	the dbsend facility:  EMFILE from proc_open(), EINTR from
	proc_close(), and ECHILD from proc_sendrecv() and other
	routines.

	PHKL_13011:
	Systems running Allbase database experienced data
	page fault panics:

	trap type 15, pcsq.pcoq = 0.2956c4, isr.ior = 0.14
	panic: (display==0xbd00, flags==0x0) Data page fault

	Kernel stack trace:
	 panic+0x10
	 report_trap_or_int_and_panic+0xe8
	 trap+0xf84
	 $RDB_trap_patch+0x20
	 proc_close+0x304
	 syscall+0x1a4
	 $syscallrtn+0x0

Defect Description:
	PHKL_17059:
	Lack of locking in proc_open() and other routines in the
	dbsend facility causes synchronization errors.  Two
	processes doing concurrent proc_open() to each other can
	mistakenly think the other already has a connection
	established with someone else.  In proc_close(), a process
	waking from a sleep and still finding its partner with a
	connection mistakenly assumes it was woken with a signal.

	PHKL_13011:
	During the close down of a DB connection, proc_close()
	switches out the source process while waiting for
	a signal or the destination to close down. After
	waking up, proc_close() continues to dereference the
	destination's thread without checking if the destination
	process is still alive or not. It hits a data page fault
	when the destination process has already exited.

SR:
	5003390492 5003441147

Patch Files:
	/usr/conf/lib/libhp-ux.a(kern_db.o)

what(1) Output:
	/usr/conf/lib/libhp-ux.a(kern_db.o):
		kern_db.c $Date: 99/01/14 10:11:00 $ $Revision: 1.9.
			98.5 $ PATCH_10.20 (PHKL_17059)

cksum(1) Output:
	1750390831 17324 /usr/conf/lib/libhp-ux.a(kern_db.o)

Patch Conflicts: None

Patch Dependencies: None

Hardware Dependencies: None

Other Dependencies: None

Supersedes:
	PHKL_13011

Equivalent Patches:
	PHKL_17060:
	s800: 10.20

Patch Package Size: 80 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_17059

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_17059.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/PHKL_17059.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/PHKL_17059.  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 PHKL_17059.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/PHKL_17059.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions: None