Patch Name:  PHKL_1557

Patch Description: Eliminate kernel panic - pdeunmap pde not found

    Problem this patch addresses:
        Under some circumstances, a kernel defect would create two private
        text regions with the same space id.  This results in the same address
        translation for different pages.  The neccessary conditions are:
                a) The program being executed must be linked with
                   "trap on null dreference" capability.  Since this is
                   the default for Pascal, C and Fortran, most executables
                   are using this option.
                b) A debugger (ie. xdb) must be run on a program which is
                   being shared by one or more processes.  The debugger
                   must adopt one of the running processes and modify the
                   text region. One way to modify the text region is to
                   set a breakpoint.

                   Another way to encounter the defect is to run the debugger
                   on program which forks a child process.  Again, the text
                   region of one of the processes must be modified after the
                   fork.  If one of the processes does an "exec" after the
                   fork, it is immune to the problem.

Path Name:  /hp-ux_patches/s700/8.X/PHKL_1557

Effective Date:  920927

Patch Files:  
/system/PHKL_1557/new/vm_vas.o

SR/APR#:  None

"what" string/timestamp:  
vm_vas.o:
        PATCH_8.05: vm_vas.o 1.8.43.7 92/09/27 PHKL_1557

"sum" output:  
60307 21 vm_vas.o

Dependencies:  Applies only to S700 8.05 kernels.

Supersedes: None.

Patch Package Size:  41 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.

     Note: Please back up your system before you patch.

---------------------------------------------------------------------------
After getting the patch onto your machine, unshar the patch (sh PHKL_1557).

To install this patch do the following:
1) Run /etc/update (Note: you must be logged in as root to update
   a system).
2) Once in the update "Main Menu" move the highlighted line to "Change
   Source or Destination ->" and press "Return" or "Select Item".
3) Make sure the highlighted item in the "Change Source or Destination"
   window is "From Tape Device to Local System ...", then press "Return" or
   "Select Item".
4) You should now be in the "From Tape Device to Local System" window.
   Change the "Source:  /dev/rmt/0m" to "Source: /tmp/PHKL_1557.updt"
   (this assumes that you are in the /tmp directory where PHKL_1557.updt
   has been placed).  Note: You must enter the complete path name.
5) Press "Done".
6) From here on follow the standard directions for update.

The customized script that update runs will move the original software
to /system/PHKL_1557/orig.  HP recommends keeping this software there in
order to recover from any potential problems.  It is also recommended that
you move the PHKL_1557.text file to /system/PHKL_1557 to be retained for
future reference.

If you wish to put this patch on a magnetic tape and update from the tape
drive, dd a copy of the patch to the tape drive.  As an example the
following will create a copy of the patch that update can read:
dd if=PHKL_1557.updt of=/dev/rmt/0m bs=2048