Patch Name:  PHKL_4129

Patch Description: s700 8.07 panic: vn_rele() with large inode table

This patch eliminates a panic that occurs when the
v_count field of a vnode with v_fstype == VDEV_VN overflows

System panics with "panic:  vn_rele()", after heavy activity (such as a
'find') on a single filesystem on an installation with a large inode
table.  Examination of the core dump shows that the vnode argument to
vn_rele() has v_fstype set to VDEV_VN, and v_count has exceeded 32K.

On large systems it is perfectly reasonable for v_count to exceed this
value, but the condition is seen as an underflow on the next call to
vn_rele().

In release 9.0 the v_count field will be a full word, but for 8.07 the
change to the header file and resulting data structure sizes was deemed
too risky.

The patch causes vn_rele() to ignore device vnodes, which were never
released or reclaimed anyway.

Path Name:  /hp-ux_patches/s700/8.X/PHKL_4129

Effective Date:  940425

OS Release:  8.07

Reboot Required:  Yes

Patch Files:  
/system/PHKL_4129/new/vfs_vnode.o

SR#:  5000707141

"what" string/timestamp:  
vfs_vnode.o:
        vfs_vnode.c $Revision: 1.10.77.3 $$Date: 94/04/25 19:57:43 $
PATCH_8.07 PHKL_4129


"sum" output:  
41019 15 vfs_vnode.o


Dependencies:  None

Supersedes:  None

Patch Package Size:  72 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_4129).

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_4129.updt"
   (this assumes that you are in the /tmp directory where PHKL_4129.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_4129/orig.  HP recommends keeping this software there in
order to recover from any potential problems.  It is also recommended that
you move the PHKL_4129.text file to /system/PHKL_4129 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_4129.updt of=/dev/rmt/0m bs=2048