BUG #1011: Explain analyze "query" cause segv

The following bug has been logged online:

Bug reference: 1011
Logged by: Pawel Rutkowski
Email address: sor(at)rsc(dot)pl
PostgreSQL version: 7.4
Operating system: FreeBSD rsc.pl 4.9-STABLE FreeBSD 4.9-STABLE #22: Tue Dec 2 20:31:00 CET 2003
Description: Explain analyze "query" cause segv
Details:

I've notice problem with some explain analyze queries.
First explain works great but running same explain once again cause Segmentation Fault.

I've test it on two machines (Celeron 1.7GHz 1GB RAM, 2xPIII 1.1GHz 512MB RAM) with same result.

There is test case (notice there is ltree column):
(its also avaiable at: http://www.manifest.pl/case.sql)

CREATE TABLE p (
id serial NOT NULL,
kat ltree NOT NULL,
name text,
id_pricelist integer,
manufactur character varying(50),
weight character varying(20),
price double precision,
stock text,
id_pricelist_int integer,
manufactur_code character varying(50) NOT NULL
);

COPY p (id, kat, name, id_pricelist, manufactur, weight, price, stock, id_pricelist_int, manufactur_code) FROM stdin;
1364380 root.tillbeh___ouml____r.h___ouml____gtalare Speaker Soundwave 3000P 5.1 20W SUB 5W Center 4x5W Satelite RMS 15 TRUST 498 13 15 12951
1364353 root.tillbeh___ouml____r.h___ouml____gtalare Speaker Soundwave 350P 2x2W RMS 350W PMPO Retail 15 TRUST 130 4 16 13026
1364354 root.tillbeh___ouml____r.h___ouml____gtalare Speaker SoundWave 450P 2x3W RMS 450W PMPO Retail 15 TRUST 166 9 16 13028
1364352 root.tillbeh___ouml____r.h___ouml____gtalare Speaker SoundWave 200P 2x2W RMS Retail 15 TRUST 137 8 16 12558
1366057 root.tillbeh___ouml____r.h___ouml____gtalare Trust Speakers SoundWave 100p 16 TRUST 68 2003-12-17 16 12605
1364378 root.tillbeh___ouml____r.h___ouml____gtalare Speaker SoundWave 1000P Retail 15 TRUST 177 19 15 12616
1364379 root.tillbeh___ouml____r.h___ouml____gtalare Speaker SoundWave 2000P 5.1 Retail 15 TRUST 353 2 15 12618
1367533 root.tillbeh___ouml____r.h___ouml____gtalare Hvgtalare i trd, 300W PMPO, aktiv 18 MEGAPART 80 918 18 SP-100
1367534 root.tillbeh___ouml____r.h___ouml____gtalare Hvgtalare i trd, 300W PMPO, aktiv, svart 18 MEGAPART 80 0 18 SP-101
1367535 root.tillbeh___ouml____r.h___ouml____gtalare Subwooferpaket i trd, 800W PMPO, 20W RMS 18 MEGAPART 200 211 18 SP-300
\.
EXPLAIN ANALYZE select a.manufactur from p a where kat ~ 'root.tillbeh___ouml____r.h___ouml____gtalare.*' group by manufactur order by lower(manufactur);
EXPLAIN ANALYZE select a.manufactur from p a where kat ~ 'root.tillbeh___ouml____r.h___ouml____gtalare.*' group by manufactur order by lower(manufactur);

and here is backtrace from gdb:
(also avaiable at http://www.manifest.pl/bt.txt)
#0 0x81ca0ef in AllocSetAlloc (context=0x83ae120, size=38) at aset.c:546
546 if (chunk->size >= size)
(gdb) bt
#0 0x81ca0ef in AllocSetAlloc (context=0x83ae120, size=38) at aset.c:546
#1 0x81ca931 in MemoryContextAlloc (context=0x83ae120, size=38) at mcxt.c:485
#2 0x81a331e in textout (fcinfo=0xbfbfea84) at varlena.c:285
#3 0x81c16ba in FunctionCall3 (flinfo=0x8411528, arg1=138125792, arg2=0, arg3=4294967295) at fmgr.c:1016
#4 0x8081c59 in printtup (tuple=0x83ba1b0, typeinfo=0x8389c18, self=0x83b1778) at printtup.c:337
#5 0x8165e27 in RunFromStore (portal=0x83b5018, direction=ForwardScanDirection, count=0, dest=0x83b1778) at pquery.c:695
#6 0x8165c51 in PortalRunSelect (portal=0x83b5018, forward=1, count=2147483647, dest=0x83b1778) at pquery.c:573
#7 0x8165b66 in PortalRun (portal=0x83b5018, count=2147483647, dest=0x83b1778, altdest=0x83b1778, completionTag=0xbfbfecd4 "")
at pquery.c:467
#8 0x8162c7b in exec_simple_query (
query_string=0x83b1018 "EXPLAIN ANALYZE select a.manufactur from p a where kat ~ 'root.tillbeh___ouml____r.h___ouml____gtalare.*' group by manufactur order by lower(manufactur);") at postgres.c:873
#9 0x816501f in PostgresMain (argc=4, argv=0x8335488, username=0x8335458 "rsctest") at postgres.c:2868
#10 0x8144a0d in BackendFork (port=0x8332600) at postmaster.c:2558
#11 0x814422b in BackendStartup (port=0x8332600) at postmaster.c:2201
#12 0x8142b13 in ServerLoop () at postmaster.c:1113
#13 0x8142597 in PostmasterMain (argc=1, argv=0x8322040) at postmaster.c:891
#14 0x8118fd3 in main (argc=1, argv=0xbfbffc94) at main.c:214

Regards
Pawel