Patch-ID# 100149-01
Keywords: panic mclput mbuf IP packet
Synopsis: SunOS 4.1 and 4.1.1: system crashes with mclput panic
Date: Oct-25-90

SunOS release: 4.1 4.1.1

Topic: kernel panic mclput

BugID's fixed with this patch: 1041559

Architectures for which this patch is available: sun3 sun4 sun4c

Problem description:

Certain sequence of IP packets cause the mbuf chain to
be corrupted resulting in the above panic.

Fix description:

The fix includes patched version of:

ip_input.o

Install instructions:

After extracting fix tape contents into /tmp, as root install
the appopriate sun3 sun4 or sun4c patches as follows:

 cd /sys/{sun3,sun4,sun4c}/OBJ
 mv ip_input.o ip_input.o_orig
 cp /tmp/{sun3,sun4,sun4c}/ip_input.o ip_input.o
 chmod 444 ip_input.o
 
 A new kernel will need to be configured and built.
 Please refer to the "System and Network Administration" portion
 of the manual for building and installing a custom kernel.