Patch-ID# 100356-02
Keywords: aiocancel, lwp, lightweight processes, hang
Synopsis: SunOS 4.1.1:Heavy use of lightweight processes can cause system to hang.
Date: 30-Aug-91
 
SunOS release: 4.1, 4.1.1
 
Topic: hang, aiocancel
 
BugId's fixed with this patch: 1067615

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

Patches which may conflict with this patch: 100244-02, 100356-01

Obsoleted by: 4.1.2

Problem Description: 
	When heavy use is made of lightweight processes, the system
	can lock up completely; it may even be impossible to break
	out via L1-A. This is due to the CPU entering an infinite
	tight loop in the lwp code.

	This version replaces 100356-01. The changes here are:
		1) Added support for the sun3 and sun3x architecture.
		2) Fixed a typo in the README for the bug id.


INSTALL:

As root,

mv /sys/`arch -k`/OBJ/lwputil.o /sys/`arch -k`/OBJ/lwputil.o.fcs
cp `arch -k`/lwputil.o /sys/`arch -k`/OBJ/lwputil.o

You will then have to re-run config and make on your kernel.
Please refer to the System and Network administration manual
for information on building and installing a custom kernel.