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From: ehrlich@psuvax1.psu.edu (Dan Ehrlich)
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Problems with UDP in 4.3BSD?????
Message-ID: <3032@psuvax1.psu.edu>
Date: Wed, 28-Oct-87 15:11:33 EST
Article-I.D.: psuvax1.3032
Posted: Wed Oct 28 15:11:33 1987
Date-Received: Sat, 31-Oct-87 09:06:23 EST
Sender: ehrlich@psuvax1.psu.edu
Reply-To: ehrlich@psuvax1.psu.edu (Dan Ehrlich)
Organization: Penn State University, Department of Computer Science
Lines: 24
Keywords: 4.3BSD, UDP, crash and burn
Xref: mnetor comp.unix.questions:4699 comp.unix.wizards:5172

Of late our 4.3BSD UNIX kernel has been doing crash and burns of the
"panic: protection fault" variety.  Not being an kernel debugging
wizard I have a few questions.  First background.  The only thing that
has "changed" in the last 3-4 weeks is we are now heavily using a
program the runs IBM's RSCS protocol over UDP (N.B. it is blindingly
fast and beats a 9600 baud synch modem but a mile). We use it to
connect BITnet hosts on our campus together.  It can generate quit a
large number of packets in a short time and I have a gut feeling that
we mave have uncovered a bug in the UDP code.  Not wanting to point an
acusing fingers without enough eveidence, if anyone can answer the
following for me I would appreciate hearing from you.

1) How does one determine where in the kernel the protection
   fault occured using adb?

2) I have been told that the scripts in /usr/lib/adb "do not
   work".  I find this hard to believe as they were being
   pushed by Karl McKusick in the "Advanced 4.3 Internals"
   course at the Phoenix USENIX.  Any comments?
   
3) Are there any "friendlier" tools than adb for doing
   crash dump analysis?

Any help would be greatly appreciated.  Thanks in advance.