Bus error in postgres 8.3

Hi all,

I'm looking to push 8.3 out this week, but I'm running into a
particularly nasty bus error. I'm not sure what's causing it as it
appears to be transient (or at least somewhat random), but I do know
that it bites on connection time and takes down the entire server with
it.

I'm going to try to force a crash on my test server to see if I can
find out anything more. Does anyone know how to get useful debugging
info at the time of the crash? I don't think I have things set to dump
core anywhere, but that and/or stack traces would be nice (especially
for child processes).

If anyone has any idea what's going on and could clue me in, that
would be excellent.

Peter

P.S. Here's the syslog transcript of the crash.

Apr 28 23:02:02 mitchell postgres[3442]: [3-1] LOG:  connection
received: host=mitchell.cs.wisc.edu ****t=37588
Apr 28 23:02:02 mitchell postgres[3442]: [4-1] LOG:  connection
authorized: user=postgres database=template1
Apr 28 23:02:02 mitchell postgres[3442]: [5-1] LOG:  disconnection:
session time: 0:00:00.239 user=postgres database=template1
host=mitchell.cs.wisc.edu ****t=37588
Apr 28 23:02:02 mitchell postgres[3444]: [3-1] LOG:  connection
received: host=mitchell.cs.wisc.edu ****t=37589
Apr 28 23:02:02 mitchell postgres[3444]: [4-1] LOG:  connection
authorized: user=postgres database=564testdb
Apr 28 23:02:02 mitchell postgres[461]: [3-1] LOG:  server process
(PID 3444) was terminated by signal 7: Bus error
Apr 28 23:02:02 mitchell postgres[461]: [4-1] LOG:  terminating any
other active server processes
Apr 28 23:02:02 mitchell postgres[461]: [5-1] LOG:  all server
processes terminated; reinitializing
Apr 28 23:02:02 mitchell postgres[3447]: [6-1] LOG:  connection
received: host=mitchell.cs.wisc.edu ****t=37590
Apr 28 23:02:02 mitchell postgres[3447]: [7-1] FATAL:  the database
system is in recovery mode
Apr 28 23:02:02 mitchell postgres[3448]: [6-1] LOG:  connection
received: host=mitchell.cs.wisc.edu ****t=37591
Apr 28 23:02:02 mitchell postgres[3448]: [7-1] FATAL:  the database
system is in recovery mode
Apr 28 23:02:23 mitchell postgres[461]: [6-1] LOG:  startup process
(PID 3446) was terminated by signal 7: Bus error
Apr 28 23:02:23 mitchell postgres[461]: [7-1] LOG:  aborting startup
due to startup process failure
Apr 28 23:22:15 mitchell postgres[3702]: [1-1] LOG:  could not load
root certificate file "root.crt": No such file or directory
Apr 28 23:22:15 mitchell postgres[3702]: [1-2] DETAIL:  Will not
verify client certificates.
Apr 28 23:22:15 mitchell postgres[3703]: [2-1] LOG:  database system
was interrupted; last known up at 2008-04-28 07:02:32 CDT
Apr 28 23:22:15 mitchell postgres[3703]: [3-1] LOG:  database system
was not properly shut down; automatic recovery in progress
Apr 28 23:22:15 mitchell postgres[3703]: [4-1] LOG:  record with zero
length at 6/915320A0

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