> 2023年9月5日 下午9:08，PG Bug reporting form <noreply(at)postgresql(dot)org> 写道：
>
> The following bug has been logged on the website:
>
> Bug reference: 18087
> Logged by: yajun Hu
> Email address: 1026592243(at)qq(dot)com
> PostgreSQL version: 11.21
> Operating system: CentOS7 with kernel version 5.10
> Description:
>
> hi, community partners.
> I found a false positives when use pg_check_visible, I build postgresql
> with REL_11_STABLE, run this SQL
> select pg_create_logical_replication_slot ('test','pgoutput');
> create table t( a int);
> insert into t select 1;
> insert into t select 1;
> insert into t select 1;
> vacuum t;
> select * from pg_check_visible('t'); -- output ctid, which is false
> positives
>
> I analyze this problem, guess in collect_corrupt_items, GetOldestXmin use
> rel = NULL
> to get alldbs oldestXmin which will influenced by replication slot and other
> database
> long transaction. But Vacuum get relation's database oldestXmin.
>
> I will put my fix patch behind
>
> Regrads, Yajun Hu
>
Here are my fix patch, thinks.