Patch-ID#  100262-01
Keywords: st driver, exabyte, divide by zero
Synopsis: SunOS 4.1.1:st driver can panic with divide by zero in stclose()
Date: 04-April-91
 
SunOS release: SunOS 4.1.1
 
Unbundled Product: 
 
Unbundled Release: 
 
Topic: Fix to prevent zero divide panic originating from stclose().
 
BugId's fixed with this patch: 1052888

Architectures for which this patch is available: sun4, sun3, sun3x not
                                                 needed on sun4c

Patches which may conflict with this patch: 

Obsoleted by: 

Problem Description: 

	When a scsi tape device is interrupted or encounters some other
unexpected error, it can panic with a "zero divide trap".  It is known to
occur most often with Exabyte tape drives.  This panic condition has been
fixed by checking for a possible zero divide.

INSTALL:

 AS root:
# mv /sys/sun{3,3x,4}/OBJ/st.o /sys/sun{3,3x,4}/OBJ/st.o.FCS
# cp sun{3,3x,4}/st.o /sys/sun{3,3x,4}/OBJ/st.o

a new kernel will then need to be built and installed.
Please refer to the system and network administration manual
on building and installing a custom kernel.