Date: Wed, 9 Oct 2019 16:28:27 +0200
From: Tomas Vondra <tomas.vondra@2ndquadrant.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: buschmann@nidsa.net, pgsql-bugs@lists.postgresql.org
Subject: Re: BUG #16045: vacuum_db crash and illegal memory alloc after
 pg_upgrade from PG11 to PG12
Message-ID: <20191009142827.6eph24m3se4clcwh@development>
References: <16045-673e8fa6b5ace196@postgresql.org>
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 <20191009135907.km2b5nrzflcz6xey@development>
 <20543.1570630021@sss.pgh.pa.us>
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On Wed, Oct 09, 2019 at 10:07:01AM -0400, Tom Lane wrote:
>Tomas Vondra <tomas.vondra@2ndquadrant.com> writes:
>> FWIW I can reproduce this - it's enough to do this on the 11 cluster
>
>I failed to reproduce any problem from your example, but I was trying
>in C locale on a Linux machine.  What environment are you testing?
>
>			regards, tom lane

test=# show lc_collate ;
 lc_collate 
------------
 C.UTF-8
(1 row)


I can reproduce this pretty easily like this:

1) build 11

git checkout REL_11_STABLE
./configure --prefix=/home/user/pg-11 --enable-debug --enable-cassert && make -s clean && make -s -j4 install

2) build 12

git checkout REL_12_STABLE
./configure --prefix=/home/user/pg-12 --enable-debug --enable-cassert && make -s clean && make -s -j4 install

3) create the 11 cluster

/home/user/pg-11/bin/pg_ctl -D /tmp/data-11 init
/home/user/pg-11/bin/pg_ctl -D /tmp/data-11 -l /tmp/pg-11.log start
/home/user/pg-11/bin/createdb test
/home/user/pg-11/bin/psql test

4) create the table

    create table q_tbl_archiv as
    with
    qseason as (
    select table_name,column_name, ordinal_position
    ,replace(column_name,'_season','') as col_qualifier
    -- ,'id_'||replace(column_name,'_season','') as id_column
    from information_schema.columns
    order by table_name
    )
    select qs.*,c.column_name as id_column, c.column_default as id_default
    from
            qseason qs
            left join information_schema.columns c on c.table_name=qs.table_name and
    c.column_name like 'id_%';

5) shutdown the 11 cluster

  /home/user/pg-11/bin/pg_ctl -D /tmp/data-11 stop

6) init 12 cluster

  /home/user/pg-12/bin/pg_ctl -D /tmp/data-12 init

7) do the pg_upgrade thing

  /home/user/pg-12/bin/pg_upgrade -b /home/user/pg-11/bin -B /home/user/pg-12/bin -d /tmp/data-11 -D /tmp/data-12 -k

8) start 12 cluster

  /home/user/pg-12/bin/pg_ctl -D /tmp/data-12 -l /tmp/pg-12.log start

9) kabooom

  /home/user/pg-12/bin/psql test -c "analyze q_tbl_archiv"


On my system (Fedora 30 in x86_64) this reliably results a crash (and
various other crashes as demonstrated in my previous message).

regards

-- 
Tomas Vondra                  http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services