TECHNICAL INFORMATION DOCUMENT

TITLE:              PTF192 - Pullupmsg Patch
DOCUMENT ID:        TID300132
DOCUMENT REVISION:  C
DATE:               25JAN95
ALERT STATUS:       Yellow
INFORMATION TYPE:   Symptom Solution
README FOR:         PTF192

PRODUCT and VERSION:
UnixWare 1.1

ABSTRACT:

This file contains UnixWare PTF192 - Pullupmesg Patch. This patch 
corrects an error in the pullupmsg() routine which can result in 
corrupted messages. This PTF should be installed on all 
UnixWare 1.1.2 systems.


SYMPTOM

The most commonly observed symptom of the problem is corrupted 
NFS files. System panics have also been encountered.  The latest 
3C5x9 (el3) driver is known to expose the problem, since it 
dupb()'s message blocks at interrupt level.

SOLUTION

Apply the ptf192 file.


Installation Instructions:

DATATYPE: datastream

1.  Download the ptf192.Z and ptf192.txt files to the /tmp directory  
    on your machine.

2.  Read the release notes contained in this file and follow the
    instuctions to add the packages to your system.

3.  Now become root, uncompress the file and add the package to your 
    system using the following commands:

        $ su
        # uncompress /tmp/ptf192.Z
        # pkgadd -d /tmp/ptf192 ptf192

Solution Specifics

General Description.
-------------------

This PTF corrects a recently-discovered error in the pullupmsg() routine.  
The error is that pullupmsg() does not raise the system priority 
level early enough in its processing, leaving a window in which 
an interrupt-level routine can dupb() an message block which 
pullupmsg is currently manipulating, resulting in corrupted messages.  
The corrupted messages produce various symptoms, including NFS 
file corruption and system panics.

New Features.
------------

None

Software Notes and Recommendations.
----------------------------------

This PTF should be installed on all UnixWare 1.1.2 systems.

Hardware Notes and Recommendations.
----------------------------------

This PTF is targeted for the i386 and i486 CPU's.

Installation Instructions.
-------------------------

This PTF consists of 1 3.5 inch floppy.  Insert the floppy into the drive
and, while logged in as root, type

     pkgadd -d diskette1

and follow the instructions output by pkgadd.