7.3.4 vacuum/analyze error

I'm getting a slew of these repeatable errors when running ANALYZE
and/or VACUUM ANALYZE (from an autovacuum process) against a
7.3.4 cluster on HP-UX B.11.00:

2004-09-29 18:14:53.621 [520] ERROR: Memory exhausted in AllocSetAlloc(1189)

This error is in the FAQ, but that answer does not appear applicable.
The error is occurring on 2 different databases, on multiple tables,
and all tables involved are frequently updated.

Any clues?

Here's an example with more context:

2004-09-29 18:20:55.426 [3728] LOG: query: ANALYZE audit
TopMemoryContext: 32792 total in 4 blocks; 11664 free (23 chunks); 21128 used
TopTransactionContext: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
DeferredTriggerXact: 0 total in 0 blocks; 0 free (0 chunks); 0 used
TransactionCommandContext: 8192 total in 1 blocks; 8176 free (9 chunks); 16 used
QueryContext: 8192 total in 1 blocks; 7440 free (1 chunks); 752 used
Analyze: 132263832 total in 27 blocks; 2984 free (35 chunks); 132260848 used
Vacuum: 8192 total in 1 blocks; 8152 free (0 chunks); 40 used
DeferredTriggerSession: 0 total in 0 blocks; 0 free (0 chunks); 0 used
PortalMemory: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
CacheMemoryContext: 516096 total in 6 blocks; 170872 free (1 chunks); 345224 used
pg_index_indrelid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_toast_16410_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_stat_all_tables: 19456 total in 19 blocks; 216 free (0 chunks); 19240 used
pg_settings: 5120 total in 5 blocks; 336 free (0 chunks); 4784 used
pg_conversion_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_index_indexrelid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_shadow_usesysid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_rewrite_rel_rulename_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_group_name_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_opclass_am_name_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_cast_source_target_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_language_name_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_type_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_language_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_amop_opc_strategy_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_statistic_relid_att_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_amproc_opc_procnum_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_class_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_class_relname_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_type_typname_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_attribute_relid_attnam_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_trigger_tgrelid_tgname_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_conversion_default_index: 2072 total in 2 blocks; 712 free (0 chunks); 1360 used
pg_aggregate_fnoid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_namespace_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_group_sysid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_attribute_relid_attnum_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_shadow_usename_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_namespace_nspname_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_inherits_relid_seqno_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_operator_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_conversion_name_nsp_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
pg_opclass_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_proc_proname_args_nsp_index: 2072 total in 2 blocks; 712 free (0 chunks); 1360 used
pg_proc_oid_index: 1024 total in 1 blocks; 640 free (0 chunks); 384 used
pg_operator_oprname_l_r_n_index: 2072 total in 2 blocks; 712 free (0 chunks); 1360 used
pg_amop_opc_opr_index: 1024 total in 1 blocks; 320 free (0 chunks); 704 used
MdSmgr: 8192 total in 1 blocks; 6120 free (0 chunks); 2072 used
DynaHash: 8192 total in 1 blocks; 7064 free (0 chunks); 1128 used
DynaHashTable: 8192 total in 1 blocks; 5080 free (0 chunks); 3112 used
DynaHashTable: 8192 total in 1 blocks; 6112 free (0 chunks); 2080 used
DynaHashTable: 8192 total in 1 blocks; 3016 free (0 chunks); 5176 used
DynaHashTable: 8192 total in 1 blocks; 4040 free (0 chunks); 4152 used
DynaHashTable: 24576 total in 2 blocks; 13240 free (4 chunks); 11336 used
DynaHashTable: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
DynaHashTable: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
DynaHashTable: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
DynaHashTable: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
DynaHashTable: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
ErrorContext: 8192 total in 1 blocks; 8176 free (0 chunks); 16 used
2004-09-29 18:20:56.580 [3728] ERROR: Memory exhausted in AllocSetAlloc(1189)
2004-09-29 18:20:56.580 [3728] LOG: statement: ANALYZE audit