old 7.2 bug?

I have had an odd core dump in a bit of code that runs every hour since March
2001, and for some reason just dumped core...

PostgreSQL 7.2 on i386-unknown-netbsdelf1.5ZC, compiled by GCC 2.95.3
fe-exec.c:
     $Header: /projects/cvsroot/pgsql/src/interfaces/libpq/fe-exec.c,v 1.113 2001/10/25 05:50:13 momjian Exp $

(gdb) bt
#0  0x480f1d63 in strtol () from /usr/lib/libc.so.12
#1  0x480f1e53 in strtol () from /usr/lib/libc.so.12
#2  0x480f257d in strtol () from /usr/lib/libc.so.12
#3  0x480656fd in pqResultAlloc (res=0x81cfa80, nBytes=32, isBinary=1 '\001')
    at fe-exec.c:392
#4  0x48065ffd in getRowDescriptions (conn=0x8050000) at fe-exec.c:1025
#5  0x48065e16 in parseInput (conn=0x8050000) at fe-exec.c:919
#6  0x4806648d in PQgetResult (conn=0x8050000) at fe-exec.c:1249
#7  0x48066629 in PQexec (conn=0x8050000,
    query=0x804e080 "SELECT MAX(fromoctets),MAX(tooctets) FROM stats,trans WHERE stats.id=stats_id AND
firsttimei=494282304AND sourcepeeraddress='xxx.yyy.zzz.aaa' AND flowindex=4455 AND timeslice<'20:40:00 Thu  4 Jul
200"...)
    at fe-exec.c:1362
#8  0x8049a01 in dladdr ()
#9  0x8049145 in dladdr ()
#10 0x8048d5c in free ()
(gdb)

This is from within a C program (odd that main() and yyparse() don't appear
above...) and running the query by hand just gives:

 max  | max
------+------
 8100 | 8100
(1 row)

The code at pqResultAlloc() is:

    /* Otherwise, start a new block. */
    block = (PGresult_data *) malloc(PGRESULT_DATA_BLOCKSIZE);
    if (!block)
        return NULL;
    block->next = res->curBlock;

(gdb) frame 3
#3  0x480656fd in pqResultAlloc (res=0x81cfa80, nBytes=32, isBinary=1 '\001')
    at fe-exec.c:392
392             block = (PGresult_data *) malloc(PGRESULT_DATA_BLOCKSIZE);
(gdb) print block
$5 = (PGresult_data *) 0x48122000
(gdb) print *block
$6 = {next = 0x0, space = ""}
(gdb) print *res
$7 = {ntups = 0, numAttributes = 2, attDescs = 0x0, tuples = 0x0,
  tupArrSize = 0, resultStatus = PGRES_TUPLES_OK,
  cmdStatus = '\000' <repeats 39 times>, binary = 0, xconn = 0x8050000,
  noticeHook = 0x4806540c <defaultNoticeProcessor>, noticeArg = 0x0,
  client_encoding = 0, errMsg = 0x0, null_field = "", curBlock = 0x0,


Upgrade/ignore/comments?

Cheers,

Patrick