Dear SCO Customer,

Support Level Supplement (SLS) PTF7417A, the UnixWare 7.1.0 Replacement dlpi
Driver, addresses the problem of panics seen in the mdi_message() due to the
system receiving a packet from the network before the dlpid has rebuilt the
network daemon stream.

The dlpid will decide to restart the network daemon if it detects that it
has hung. However, the system can receive a packet from the network before
the dlpid has rebuilt the network daemon, resulting in a panic.

SLS PTF7417A provides a new dlpi driver that does not allow packets to be
received prior to the network stream being in place.

Panics seen in the mdi_message() can include:

    PANIC: kernel-mode address fault on user address 0x00000000

    Kernel Page fault from (cs:eip) = (00000100:(75C61C3)):
    eax=00000000 ebx=C3159240 ecx=00000000 edx=00A407C7 esi=C187AA40
    edi=C334F580 ebp=0000001C esp=C87D878C

    Debugger:
    eax:    0 ebx: C3159240 ecx:    0 edx: 00A407C7 elf:    110246
    esi:C187AA40 edi: C334F480 ebp: 1C esp:C87D878C

    mdi_message+123: cmpl $0X00, 0X34(%eax)


SLS PTF7417A contains the file:

        /etc/conf/pack.d/dlpi/Driver.o


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

SLS PTF7417A should only be installed on:

        UnixWare 7.1.0


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

1. Download the ptf7417a.Z and ptf7417a.txt files to the /tmp directory 
   on your machine.

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

        $ su
        Password: <type your root password>
        # uncompress /tmp/ptf7417a.Z
        # pkgadd -d /tmp/ptf7417a
        # rm /tmp/ptf7417a

3. Reboot the system after installing this SLS package.

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

        /var/sadm/pkg/ptf7417/install/ptf7417.txt


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

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

        $ su
        Password: <type your root password>
        # pkgrm ptf7417

2. Reboot the system after removing this SLS package.


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