recent failures on lorikeet

I've been looking at the recent spate of intermittent failures on my
Cygwin animal lorikeet. Most of them look something like this, where
there's 'VACUUM FULL pg_class' and an almost simultaneous "CREATE TABLE'
which fails.

2021-06-14 05:04:00.220 EDT [60c71b7f.e8bf:60] pg_regress/vacuum LOG: statement: VACUUM FULL pg_class;
2021-06-14 05:04:00.222 EDT [60c71b80.e8c0:7] pg_regress/typed_table LOG: statement: CREATE TABLE persons OF person_type;
2021-06-14 05:04:00.232 EDT [60c71b80.e8c1:3] pg_regress/inherit LOG: statement: CREATE TABLE a (aa TEXT);
*** starting debugger for pid 59584, tid 9640
2021-06-14 05:04:14.678 EDT [60c71b53.e780:4] LOG: server process (PID 59584) exited with exit code 127
2021-06-14 05:04:14.678 EDT [60c71b53.e780:5] DETAIL: Failed process was running: CREATE TABLE persons OF person_type;
2021-06-14 05:04:14.678 EDT [60c71b53.e780:6] LOG: terminating any other active server processes

Getting stack traces in this platform can be very difficult. I'm going
to try forcing complete serialization of the regression tests
(MAX_CONNECTIONS=1) to see if the problem goes away. Any other
suggestions might be useful. Note that we're not getting the same issue
on REL_13_STABLE, where the same group pf tests run together (inherit
typed_table, vacuum)

cheers

andrew

--
Andrew Dunstan
EDB: https://www.enterprisedb.com