Patch-ID# 100300-01
Keywords: on and rexd do not lock /etc/mtab, file corruption 
Synopsis: SunOS 4.1.1,4.1: automount(8) and on(1C) do not lock mtab during updates 
Date: 17-May-1991 
 
SunOS release: 4.1 4.1.1 
 
Topic: automount lock /etc/mtab 
 
BugId's fixed with this patch: 1057718 

Architectures for which this patch is available: sun3, sun4, sun4c

Patches which may conflict with this patch:100249

Obsoleted by: 

Problem Description: 
When on and automounter are used heavily in a system the /etc/mtab
file gets corrupted because rexd does not lock /etc/mtab while it
is being updated.  This problem can occur when other commands 
are being used at the same time which update /etc/mtab
ie: mount, on, automount....

INSTALL: 

As Root:
1.  kill existing automount process.
2.  mv /usr/etc/automount /usr/etc/automount.fcs
3.  cp `arch`/automount /usr/etc

Make sure the modes are correct:

4.  chmod 755 /usr/etc/automount
	-rwxr-xr-x  1 root        73728 Oct 11  1990 /usr/etc/automount*

5.  reboot the system