Parsed test spec with 2 sessions

starting permutation: lock assign1 vacuum unlock
pg_advisory_unlock_all

               
pg_advisory_unlock_all

               
step lock: 
    SELECT pg_advisory_lock(1);

pg_advisory_lock

               
step assign1: 
do $$
  declare
    x text;
  begin
    select test1.b into x from test1;
    delete from test1;
    commit;
    perform pg_advisory_lock(1);
    raise notice 'length(x) = %', length(x);
  end;
$$;
 <waiting ...>
step vacuum: 
    VACUUM test1;

step unlock: 
    SELECT pg_advisory_unlock(1);

pg_advisory_unlock

t              
s1: NOTICE:  length(x) = 6000
step assign1: <... completed>

starting permutation: lock assign2 vacuum unlock
pg_advisory_unlock_all

               
pg_advisory_unlock_all

               
step lock: 
    SELECT pg_advisory_lock(1);

pg_advisory_lock

               
step assign2: 
do $$
  declare
    x text;
  begin
    x := (select test1.b from test1);
    delete from test1;
    commit;
    perform pg_advisory_lock(1);
    raise notice 'length(x) = %', length(x);
  end;
$$;
 <waiting ...>
step vacuum: 
    VACUUM test1;

step unlock: 
    SELECT pg_advisory_unlock(1);

pg_advisory_unlock

t              
s1: NOTICE:  length(x) = 6000
step assign2: <... completed>

starting permutation: lock assign3 vacuum unlock
pg_advisory_unlock_all

               
pg_advisory_unlock_all

               
step lock: 
    SELECT pg_advisory_lock(1);

pg_advisory_lock

               
step assign3: 
do $$
  declare
    r record;
  begin
    select * into r from test1;
    r.b := (select test1.b from test1);
    delete from test1;
    commit;
    perform pg_advisory_lock(1);
    raise notice 'length(r) = %', length(r::text);
  end;
$$;
 <waiting ...>
step vacuum: 
    VACUUM test1;

step unlock: 
    SELECT pg_advisory_unlock(1);

pg_advisory_unlock

t              
s1: NOTICE:  length(r) = 6004
step assign3: <... completed>

starting permutation: lock assign4 vacuum unlock
pg_advisory_unlock_all

               
pg_advisory_unlock_all

               
step lock: 
    SELECT pg_advisory_lock(1);

pg_advisory_lock

               
step assign4: 
do $$
  declare
    r test2;
  begin
    select * into r from test1;
    delete from test1;
    commit;
    perform pg_advisory_lock(1);
    raise notice 'length(r) = %', length(r::text);
  end;
$$;
 <waiting ...>
step vacuum: 
    VACUUM test1;

step unlock: 
    SELECT pg_advisory_unlock(1);

pg_advisory_unlock

t              
s1: NOTICE:  length(r) = 6004
step assign4: <... completed>

starting permutation: lock assign5 vacuum unlock
pg_advisory_unlock_all

               
pg_advisory_unlock_all

               
step lock: 
    SELECT pg_advisory_lock(1);

pg_advisory_lock

               
step assign5: 
do $$
  declare
    r record;
  begin
    for r in select test1.b from test1 loop
      null;
    end loop;
    delete from test1;
    commit;
    perform pg_advisory_lock(1);
    raise notice 'length(r) = %', length(r::text);
  end;
$$;
 <waiting ...>
step vacuum: 
    VACUUM test1;

step unlock: 
    SELECT pg_advisory_unlock(1);

pg_advisory_unlock

t              
s1: NOTICE:  length(r) = 6002
step assign5: <... completed>