[pgpool-general: 9052] 0 th backend is not valid after upgrading to 4.5.1

[Emond Papegaaij]

Hi,

After upgrading from 4.5.0 to 4.5.1 we see lots of regressions in our
test-suite when failovers are involved with the following exception in
WildFly:
Caused by: org.postgresql.util.PSQLException: ERROR: unable to read message
kind from backend
  Detail: 0 th backend is not valid

I'm not sure what is causing this, but I've got the feeling that pgpool
keeps trying to send queries to a database that not available. I've
attached logging from pgpool. You can find the first error at 04:10:16
(or 2024-03-27T03:10:16.735933246Z pgpool timestamp).

Best regards,
Emond
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