Re: "ERROR: latch already owned" on gharial

On Thu, May 26, 2022 at 2:35 PM Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Thomas Munro <thomas.munro@gmail.com> writes:
> > On a more practical note, I don't have access to the BF database right
> > now.  Would you mind checking if "latch already owned" has occurred on
> > any other animals?
>
> Looking back 6 months, these are the only occurrences of that string
> in failed tests:
>
>  sysname | branch |      snapshot       |     stage      |                                 l
> ---------+--------+---------------------+----------------+-------------------------------------------------------------------
>  gharial | HEAD   | 2022-04-28 23:37:51 | Check          | 2022-04-28 18:36:26.981 MDT [22642:1] ERROR:  latch already owned
>  gharial | HEAD   | 2022-05-06 11:33:11 | IsolationCheck | 2022-05-06 10:10:52.727 MDT [7366:1] ERROR:  latch already owned
>  gharial | HEAD   | 2022-05-24 06:31:31 | IsolationCheck | 2022-05-24 02:44:51.850 MDT [13089:1] ERROR:  latch already owned
> (3 rows)

Thanks.  Hmm.  So far it's always a parallel worker.  The best idea I
have is to include the ID of the mystery PID in the error message and
see if that provides a clue next time.