heap_mark4update: (am)invalid tid

Hey folks,

I found reference to this problem at
http://archives.postgresql.org/pgsql-general/2003-02/msg00135.php,
but there was no apparent resolution.

Postgres is from Mandrake 9.1 install, running on an Athlon SMP with
2.4.21. Version select is:
PostgreSQL 7.3.2 on i686-pc-linux-gnu, compiled by GCC gcc (GCC)
3.2.2 (Mandrake Linux 9.1 3.2.2-3mdk)

The data is filled in from other tables, through a perl script which
runs DBD::Pg. I can dump the data if desirable. Currently, the
steps leading up the failure are not being committed.

I'd be happy to ditch the RPM and recompile from source, and can use
gdb with some direction as to find what is desired.

The error occurs on the following update:

UPDATE obs_v
SET mag = obs_v.imag + zp.zero_v + cg.color_v * (obs_v.imag -
i.imag),
use = true
FROM color_group AS cg, zero_pair AS zp, obs_i AS i, files AS f
WHERE obs_v.star_id = i.star_id
AND obs_v.file_id = f.file_id
AND cg.group_id = f.group_id
AND f.group_id = $group_id
AND zp.pair_id = f.pair_id;

$group_id happens to be 1 in this instance.

tables are as follows:

Table "public.obs_v"
Column | Type | Modifiers
---------+---------+------------------------------------------------
x | real | not null
y | real | not null
imag | real | not null
smag | real | not null
ra | real | not null
dec | real | not null
obs_id | integer | not null default nextval('"obs_id_seq"'::text)
file_id | integer | not null
use | boolean | default false
solve | boolean | default false
star_id | integer |
mag | real |
Indexes: obs_v_file_id_index btree (file_id),
obs_v_loc_index btree (ra, "dec"),
obs_v_obs_id_index btree (obs_id),
obs_v_star_id_index btree (star_id)
Foreign Key constraints: obs_v_files_constraint FOREIGN KEY (file_id)

REFERENCES files(file_id) ON UPDATE NO ACTION ON DELETE CASCADE
Triggers: obs_v_trig

Table "public.zero_pair"
Column | Type | Modifiers
---------+---------+-----------
pair_id | integer | not null
zero_u | real | default 0
zero_b | real | default 0
zero_v | real | default 0
zero_r | real | default 0
zero_i | real | default 0
Indexes: zero_pair_pkey primary key btree (pair_id)
Foreign Key constraints: $1 FOREIGN KEY (pair_id) REFERENCES
files(file_id) ON UPDATE NO ACTION ON DELETE CASCADE

Table "public.color_group"
Column | Type | Modifiers
----------+---------+-----------
group_id | integer | not null
color_u | real | default 0
color_b | real | default 0
color_v | real | default 0
color_r | real | default 0
color_i | real | default 0
Indexes: color_group_pkey primary key btree (group_id)
Foreign Key constraints: $1 FOREIGN KEY (group_id) REFERENCES
files(file_id) ON UPDATE NO ACTION ON DELETE CASCADE

Table "public.files"
Column | Type |
Modifiers
----------+--------------------------+--------------------------------

------------------------
file_id | integer | not null default
nextval('"files_file_id_seq"'::text)
group_id | integer | not null default
nextval('"files_group_id_seq"'::text)
pair_id | integer | not null default
nextval('"files_pair_id_seq"'::text)
date | timestamp with time zone | not null
name | character varying | not null
ra_min | real | default 0
ra_max | real | default 0
dec_min | real | default 0
dec_max | real | default 0
Indexes: files_pkey primary key btree (file_id)