Patch-ID# 101664-01
Keywords: point patch panic serial ports swtch
Synopsis: SunOS 4.1.3_U1: rare panic due to serial port load 
Date: Apr/11/94
 
Solaris Release: 1.1.1A

SunOS Release: 4.1.3_U1A

  NOTE: For the patch to the same bug in SunOS 4.1.2 and 4.1.3, please
        see patch 101134-02.
 
Topic: panic swtch with very active serial ports (a very rare panic)

  NOTE:  As a point patch, this fix is not currently scheduled nor will
         necessarily be approved for integration in a future SunOS release.
 
BugId's fixed with this patch: 1119423

Relevant Architecture: sparc
    NOTE: sun4c sun4 sun4m

Patches which may conflict with this patch:

Obsoleted by: 

Problem Description: 

	Very rarely a machine using serial ports heavily
	panics with panic: swtch

INSTALL: 

As root:

For all sun4 sun4c sun4m
cp `arch -k`/kern_sig.o /sys/`arch -k`/OBJ

AND for ONLY sun4 sun4c

cp `arch -k`/swtch.o /sys/`arch -k`/OBJ

Rerun /etc/config <kernel-name> and make and install the new kernel.

Please refer to the system and networking administration manual
for details on building and installing a new kernel.