Dear SCO Customer,

Support Level Supplement (SLS) ptf4045a, the SCO UnixWare 2.1.3 proc Driver
Supplement, addresses the following problem:

- Under certain conditions, a memory leak of 128 byte kernel memory
  buffers was observed from sar(1M) data or rtpm(1M) memory information.  
  Over time it is possible that a system may hang or panic when kernel 
  virtual memory is exhausted.

The leak was traced to the handling of credential structures within
the proc driver where the lwp exit code was freeing its cred structure 
but discarding cached reference counts.

A modified proc driver has been produced based upon changes implemented 
in SCO UnixWare 7.  

SLS ptf4045a is dependent on ptf4004a (the SCO UnixWare 2.1.3 lbolt Patch),
which also replaces the proc driver.  It is necessary to install ptf4004a
before ptf4045a, and ptf4045a must be removed first if it is necessary to
remove ptf4004a.


Contents
--------

        /etc/conf/pack.d/proc/Driver_atup.o
        /etc/conf/pack.d/proc/Driver_mp.o


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

SLS ptf4045a should only be installed on:

        SCO UnixWare Application Server 2.1.3
        SCO UnixWare Personal Edition 2.1.3


Installation Instructions
-------------------------

1. Download the ptf4045a.Z file to the /tmp directory on your machine.

2. As root, uncompress the file and add the package to your system
   using these commands:

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf4045a.Z
        # pkgadd -d /tmp/ptf4045a
        # rm /tmp/ptf4045a

3. Reboot the system after installing this package.

The release notes displayed prior to installation can be found in:

   /var/sadm/pkg/ptf4045/install/ptf4045.txt


Removal Instructions
--------------------

1. As root, remove the package using these commands:

        $ su
        Password: <type your root password>
        # pkgrm ptf4045

2. Reboot the system after removing this package.


If you have questions regarding this supplement, or the product on which 
it is installed, please contact your software supplier.