Troubles restoring PgSQL 8.1.3 after a crash

Hi,

I have a problem restarting postgres 8.1.3 running on FreeBSD 5.4 after
a crash. Just after start, postgresql core down, backtrace is following:

gdb ../bin/postgres postgres.core
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This GDB was configured as "i386-marcel-freebsd"...(no debugging symbols
found)...
Core was generated by `postgres'.
Program terminated with signal 4, Illegal instruction.
Reading symbols from /lib/libz.so.2...(no debugging symbols found)...done.
Loaded symbols for /lib/libz.so.2
Reading symbols from /lib/libreadline.so.5...(no debugging symbols
found)...done.
Loaded symbols for /lib/libreadline.so.5
Reading symbols from /lib/libcrypt.so.2...(no debugging symbols
found)...done.
Loaded symbols for /lib/libcrypt.so.2
Reading symbols from /lib/libm.so.3...(no debugging symbols found)...done.
Loaded symbols for /lib/libm.so.3
Reading symbols from /lib/libutil.so.4...(no debugging symbols
found)...done.
Loaded symbols for /lib/libutil.so.4
Reading symbols from /lib/libc.so.5...(no debugging symbols found)...done.
Loaded symbols for /lib/libc.so.5
Reading symbols from /lib/libncurses.so.5...(no debugging symbols
found)...done.
Loaded symbols for /lib/libncurses.so.5
Reading symbols from /libexec/ld-elf.so.1...(no debugging symbols
found)...done.
Loaded symbols for /libexec/ld-elf.so.1
#0  0x0815e70f in load_role ()
(gdb) bt
#0  0x0815e70f in load_role ()
#1  0xbfbfff94 in ?? ()
#2  0x00000014 in ?? ()
#3  0x00000000 in ?? ()
#4  0xbfbfd560 in ?? ()
#5  0x00000002 in ?? ()
#6  0x081a9710 in ServerLoop ()
#7  0x081aa9d8 in PostmasterMain ()
#8  0x0816435d in main ()


Those records are writing to stderr in starting up postgres:

pg_ctl: another postmaster may be running; trying to start postmaster anyway
Dec 23 17:00:07 uran postgres[27716]: [1-1] LOG:  database system was
interrupted at 2006-12-23 16:45:07 MSK
Dec 23 17:00:07 uran postgres[27716]: [2-1] LOG:  checkpoint record is
at 18D/8981F96C
Dec 23 17:00:07 uran postgres[27716]: [3-1] LOG:  redo record is at
18D/8981F96C; undo record is at 0/0; shutdown TRUE
Dec 23 17:00:07 uran postgres[27716]: [4-1] LOG:  next transaction ID:
1302234451; next OID: 119793642
Dec 23 17:00:07 uran postgres[27716]: [5-1] LOG:  next MultiXactId: 37;
next MultiXactOffset: 73
Dec 23 17:00:07 uran postgres[27716]: [6-1] LOG:  database system was
not properly shut down; automatic recovery in progress
Dec 23 17:00:07 uran postgres[27716]: [7-1] LOG:  record with zero
length at 18D/8981F9B0
Dec 23 17:00:07 uran postgres[27716]: [8-1] LOG:  redo is not required
Dec 23 17:00:07 uran postgres[27716]: [9-1] LOG:  database system is ready
Dec 23 17:00:07 uran postgres[27716]: [10-1] LOG:  transaction ID wrap
limit is 2023288127, limited by database "cup2002"
postmaster starting


Those messages are writting into /var/log/messages:
Dec 23 16:45:07 uran su: login_getclass: unknown class 'postgres'
Dec 23 16:45:07 uran su: login_getclass: unknown class 'postgres'
Dec 23 16:45:07 uran kernel: pid 27494 (postgres), uid 1003: exited on
signal 4 (core dumped)


Is there a way to restore database ?

zero_damaged_pages = on  already set in postgresql.conf

Thank you for any suggestion.

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