Port Bug Report: Cluster crashes

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                        POSTGRESQL BUG REPORT TEMPLATE
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Your name        : Doug Mitchell
Your email address    : doug@mitchcraft.com

Category        : runtime: back-end
Severity        : serious

Summary: Cluster crashes

System Configuration
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  Operating System   : Linux 2.0.36 / RedHat 5.2

  PostgreSQL version : 6.4.2

  Compiler used      : gcc 2.7.2

Hardware:
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PII 512MB RAM
Linux sunfish 2.0.36 #1 Tue Oct 13 22:17:11 EDT 1998 i686 unknown


Versions of other tools:
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> rpm -q make flex
make-3.76.1-5
flex-2.5.4a-4

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Problem Description:
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Program received signal SIGSEGV, Segmentation fault.
heap_insert (relation=0x81b2ba0, tup=0x0) at heapam.c:1110
1110            if (!OidIsValid(tup->t_oid))
(gdb) bt
#0  heap_insert (relation=0x81b2ba0, tup=0x0) at heapam.c:1110
#1  0x8085b72 in rebuildheap (OIDNewHeap=143620745, OIDOldHeap=138955433,
    OIDOldIndex=138955449) at cluster.c:358
#2  0x80858ff in cluster (oldrelname=0x81ac0e0 "docs",
    oldindexname=0x81ac0c0 "docs_hash") at cluster.c:161
#3  0x80d635b in ProcessUtility (parsetree=0x81ac100, dest=Remote)
    at utility.c:637
#4  0x80d3b0b in pg_exec_query_dest (
    query_string=0xbfffd314 "cluster docs_hash on docs;", dest=Remote,
    aclOverride=0) at postgres.c:758
#5  0x80d3a43 in pg_exec_query (
    query_string=0xbfffd314 "cluster docs_hash on docs;") at postgres.c:699
#6  0x80d4a60 in PostgresMain (argc=10, argv=0xbffff38c, real_argc=8,
    real_argv=0xbffffd34) at postgres.c:1645
#7  0x80c06aa in DoBackend (port=0x8172210) at postmaster.c:1532
#8  0x80c0202 in BackendStartup (port=0x8172210) at postmaster.c:1303
#9  0x80bf96d in ServerLoop () at postmaster.c:757
#10 0x80bf54c in PostmasterMain (argc=8, argv=0xbffffd34) at postmaster.c:563
#11 0x8099b40 in main (argc=8, argv=0xbffffd34) at main.c:93
(gdb)

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Test Case:
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Cluster a table which has not been recently vacuumed.

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Solution:
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