Strange crash with pg_dump

Hi everyone.

Environment:
OS: UW 713
PG: 7.3.2

I've been banging my head for a few weeks on this one and could'nt find
any answer:

pg_dump is crashing with SIGSEGV before it connects to database.
I've re-compiled with --enable-debug and --enable-cassert and even that
did'nt help.

this is gdb output not showing much:
Script started on Mon Mar 3 13:26:51 2003
~ 13:26:51: gdb /usr/local/pgsql/bin/pg_dump /archives/dbbackup/core.28913
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This GDB was configured as "i686-unknown-sysv5UnixWare7.1.3"...
Core was generated by `pg_dump forums_ahe'.
Program terminated with signal 11, Segmentation fault.
Reading symbols from /usr/local/pgsql/lib/libpq.so.3...done.
Loaded symbols for /usr/local/pgsql/lib/libpq.so.3
Reading symbols from /usr/lib/libz.so...done.
Loaded symbols for /usr/lib/libz.so
Reading symbols from /usr/local/lib/libreadline.so.3...done.
Loaded symbols for /usr/local/lib/libreadline.so.3
Reading symbols from /usr/lib/libresolv.so.2...done.
Loaded symbols for /usr/lib/libresolv.so.2
Reading symbols from /usr/lib/libsocket.so.2...done.
Loaded symbols for /usr/lib/libsocket.so.2
Reading symbols from /usr/lib/libnsl.so.1...done.
Loaded symbols for /usr/lib/libnsl.so.1
Reading symbols from /usr/lib/libdl.so.1...
warning: Lowest section in /usr/lib/libdl.so.1 is .hash at 000000a0
done.
Loaded symbols for /usr/lib/libdl.so.1
Reading symbols from /usr/lib/libm.so.1...done.
Loaded symbols for /usr/lib/libm.so.1
Reading symbols from /usr/lib/libc.so.1...done.
Loaded symbols for /usr/lib/libc.so.1
Reading symbols from /usr/lib/ns.so.1...done.
Loaded symbols for /usr/lib/ns.so.1
#0 0xbffa3dd0 in flushsmall () from /usr/lib/libc.so.1
(gdb) bt
#0 0xbffa3dd0 in flushsmall () from /usr/lib/libc.so.1
#1 0x00000030 in ?? ()
(gdb) ~ 13:27:44: exit

script done on Mon Mar 3 13:27:48 2003

If I vacuum the databse it starts to work again until the script doing
backup runs then pg_dump crashes again.

This is a test system so databases are not even accessed!
They are pulled from the real server running 7.2.3 with pg_dumpall (the
7.3 one) -h server -c|psql template1

It doesn't seem to be a database issue because it used to crash on another
one.

While I'm at it : what is the procedure to remove template1 and replace it
by template0 after a reload? It doesn't seem right to me that pg_dumpall
replace template1 but maybe I'm wrong on this one.

Thanks for your tim and help
--
Olivier PRENANT Tel: +33-5-61-50-97-00 (Work)
Quartier d'Harraud Turrou +33-5-61-50-97-01 (Fax)
31190 AUTERIVE +33-6-07-63-80-64 (GSM)
FRANCE Email: ohp(at)pyrenet(dot)fr
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