From: Andreas Seltenreich <seltenreich@gmx.de>
To: pgsql-hackers@postgresql.org
Subject: Failing assertions in indxpath.c, placeholder.c and brin_minmax.c
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Message-ID: <871tfv3wor.fsf@ex.ansel.ydns.eu>
Date: Sun, 26 Jul 2015 14:55:32 +0200
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Sender: pgsql-hackers-owner@postgresql.org

Hi,

when running my random query generator contraption[1] against the
regression database of 9.5 or master, it occasionally triggers one of
the following three assertions.  Someone more knowledgeable might want
to take a look at them...

-- FailedAssertion("!(outer_rel->rows > 0)", File: "indxpath.c", Line: 1911)
-- sample query:
    select
      rel1925354.loid as c0,
      rel1925353.version as c1
    from
      (select
    	    rel1925352.aa as c0,
    	    rel1925352.aa as c1
    	  from
    	    public.b as rel1925352
    	  where (rel1925352.bb is NULL)
    	    and (rel1925352.bb < rel1925352.bb)) as subq_303136
          inner join pg_catalog.pg_stat_ssl as rel1925353
          on (subq_303136.c0 = rel1925353.pid )
        right join pg_catalog.pg_largeobject as rel1925354
        on (subq_303136.c0 = rel1925354.pageno )
    where (rel1925353.clientdn !~ rel1925353.clientdn)
      and (rel1925353.cipher <= rel1925353.clientdn);

,----[ git bisect ]
|   first bad commit: [3f8c23c4d31d4a0e801041733deb2c7cfa577b32] Improve
|   predtest.c's ability to reason about operator expressions.
`----

-- FailedAssertion("!(!bms_is_empty(phinfo->ph_eval_at))", File: "placeholder.c", Line: 109)
-- sample query:
    select
      rel1600276.viewowner as c0,
      rel1600274.maxwritten_clean as c1,
      rel1600275.n_tup_hot_upd as c2
    from
      pg_catalog.pg_stat_bgwriter as rel1600274
          inner join pg_catalog.pg_stat_xact_all_tables as rel1600275
          on (rel1600274.maxwritten_clean = rel1600275.seq_scan )
        right join pg_catalog.pg_views as rel1600276
          right join pg_catalog.pg_operator as rel1600277
          on (rel1600276.viewname = rel1600277.oprname )
        on (rel1600275.relname = rel1600277.oprname )
    where 3 is not NULL;

,----[ git bisect ]
|   first bad commit: [f4abd0241de20d5d6a79b84992b9e88603d44134] Support
|   flattening of empty-FROM subqueries and one-row VALUES tables.
`----

-- FailedAssertion("!(key->sk_flags & 0x0080)", File: "brin_minmax.c", Line: 177)
-- sample query:
    select
      rel167978.namecol as c0
    from
      information_schema.parameters as rel167972
        left join public.student as rel167977
          inner join public.brintest as rel167978
          on (rel167977.age = rel167978.int4col )
        on (rel167972.interval_precision = rel167977.age )
    where rel167977.name <> rel167977.name;

regards,
andreas

Footnotes: 
[1]  https://github.com/anse1/sqlsmith


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