Patch Name: PHKL_16926

Patch Description: s700 10.20 WSIO SCSI cumulative patch

Creation Date: 98/11/16

Post Date:  98/12/02

Hardware Platforms - OS Releases:
	s700: 10.20

Products: N/A

Filesets:
	OS-Core.CORE-KRN

Automatic Reboot?: Yes

Status: General Superseded

Critical:
	Yes
	PHKL_16926: PANIC

Path Name: /hp-ux_patches/s700/10.X/PHKL_16926

Symptoms:
	PHKL_16926:
	SR:5003434118 DTS:JAGaa23967
	System panics (Data Page Fault) in scsi_destroy_scb

	SR:5003429654 DTS:JAGaa40369
	System panics in c720_invalid_req_done

	SR:4701407890 DTS:JAGaa23080
	Unexpected Disconnect Messages when using pass through
	driver

Defect Description:
	PHKL_16926:
	SR:5003434118 DTS:JAGaa23967
	There is a race condition between scsi_lun_open and
	scsi_start_bus_locked.  This can be fixed by incrementing
	the in_use counter before releasing the lun lock therefore
	insuring the lun stay open.

	SR:5003429654 DTS:JAGaa40369
	In c720_invalid_req_done, we directly dereference scb->busp
	without assuring that this scb is a bus scb.  The busp
	pointer is NULL if the scb is a lun scb.  Thus, the fix is
	to add a check to see whether lsp->scb->busp is NULL, if so,
	obtain the busp from lsp->scb->lp->bus instead.

	SR:4701407890 DTS:JAGaa23080
	When using the pass through driver with the "inhibit Inquiry
	on open" option (see scsi_ctl(7)) and a device on a SCSI bus
	with no other devices and repeatedly opening and closing the
	device to send but a single SCSI command, the bus is
	sometimes in the wrong state when the target device begins
	to transfer data.

SR:
	5003434118 5003429654 4701407890

Patch Files:
	/usr/conf/lib/libhp-ux.a(scsi_c720.o)
	/usr/conf/lib/libhp-ux.a(scsi_ctl.o)

what(1) Output:
	/usr/conf/lib/libhp-ux.a(scsi_c720.o):
		scsi_c720.c   $Date: 98/11/13 11:56:05 $ $Revision:
			1.5.98.37 $ PATCH_10.20 (PHKL_16926)
	/usr/conf/lib/libhp-ux.a(scsi_ctl.o):
		scsi_ctl.c    $Date: 98/11/13 11:49:40 $ $Revision:
			1.9.98.35 $ PATCH_10.20 (PHKL_16926)

cksum(1) Output:
	351232622 94892 /usr/conf/lib/libhp-ux.a(scsi_c720.o)
	938911294 68436 /usr/conf/lib/libhp-ux.a(scsi_ctl.o)

Patch Conflicts: None

Patch Dependencies:
	s700: 10.20: PHKL_16750

Hardware Dependencies: None

Other Dependencies: None

Supersedes: None

Equivalent Patches:
	PHKL_16927:
	s800: 10.20

Patch Package Size: 220 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_16926

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

		swinstall -x autoreboot=true -x match_target=true \
			-s /tmp/PHKL_16926.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_16926.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_16926.  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_16926.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_16926.depot of=/dev/rmt/0m bs=2k

Special Installation Instructions:
	This patch depends on base patch PHKL_16750 .
	For successful installation please insure that PHKL_16750
	is in the same depot with PHKL_16926, or PHKL_16750  is
	already installed.