Patch-ID# 100313-01
Keywords: umount, sync, race, hang, umount/syn, system
Synopsis: SunOS 4.1.1: umount;sync race can hang system
Date: 04/Jun/91

SunOS release: 4.1.1

Unbundled Product: 

Unbundled Release:

Topic: 

BugID's fixed with this patch: 1044668

Architectures for which this patch is available: sun4, sun4c,sun3,sun3x

Obsoleted by: 4.1.1 Patch Release; 4.1.2

Problem Description:
umount/sync race can hang system.

Instructions for installation of the patch:

 	become root by su

 	mv /sys/sun{4,4c,3,3x}/OBJ/ufs_vfsops.o /sys/sun{4,4c,3,3x}/OBJ/ufs_vfsops.o.orig
	
 	mv 4.1.1/sun{4,4c,3,3x}/ufs_vfsops.o /sys/sun{4,4c,3,3x}/OBJ/ufs_vfsops.o
	
      	Rebuild and install the new kernel and reboot.