Re: Recent 027_streaming_regress.pl hangs

I wrote:
> I'm confused by crake's buildfarm logs.  AFAICS it is not running
> recovery-check at all in most of the runs; at least there is no
> mention of that step, for example here:
> https://buildfarm.postgresql.org/cgi-bin/show_log.pl?nm=crake&dt=2024-07-25%2013%3A27%3A02

Oh, I see it: the log file that is called recovery-check in a
failing run is called misc-check if successful.  That seems
mighty bizarre, and it's not how my own animals behave.
Something weird about the meson code path, perhaps?

Anyway, in this successful run:

https://buildfarm.postgresql.org/cgi-bin/show_stage_log.pl?nm=crake&dt=2024-07-25%2018%3A57%3A02&stg=misc-check

here are some salient test timings:

  1/297 postgresql:pg_upgrade / pg_upgrade/001_basic                                    OK                0.18s   9
subtestspassed 
  2/297 postgresql:pg_upgrade / pg_upgrade/003_logical_slots                            OK               15.95s   12
subtestspassed 
  3/297 postgresql:pg_upgrade / pg_upgrade/004_subscription                             OK               16.29s   14
subtestspassed 
 17/297 postgresql:isolation / isolation/isolation                                      OK               71.60s   119
subtestspassed 
 41/297 postgresql:pg_upgrade / pg_upgrade/002_pg_upgrade                               OK              169.13s   18
subtestspassed 
140/297 postgresql:initdb / initdb/001_initdb                                           OK               41.34s   52
subtestspassed 
170/297 postgresql:recovery / recovery/027_stream_regress                               OK              469.49s   9
subtestspassed 

while in the next, failing run

https://buildfarm.postgresql.org/cgi-bin/show_stage_log.pl?nm=crake&dt=2024-07-25%2020%3A18%3A05&stg=recovery-check

the same tests took:

  1/297 postgresql:pg_upgrade / pg_upgrade/001_basic                                    OK                0.22s   9
subtestspassed 
  2/297 postgresql:pg_upgrade / pg_upgrade/003_logical_slots                            OK               56.62s   12
subtestspassed 
  3/297 postgresql:pg_upgrade / pg_upgrade/004_subscription                             OK               71.92s   14
subtestspassed 
 21/297 postgresql:isolation / isolation/isolation                                      OK              299.12s   119
subtestspassed 
 31/297 postgresql:pg_upgrade / pg_upgrade/002_pg_upgrade                               OK              344.42s   18
subtestspassed 
159/297 postgresql:initdb / initdb/001_initdb                                           OK              344.46s   52
subtestspassed 
162/297 postgresql:recovery / recovery/027_stream_regress                               ERROR           840.84s   exit
status29 

Based on this, it seems fairly likely that crake is simply timing out
as a consequence of intermittent heavy background activity.

            regards, tom lane