Odd openbsd CI failure - Mailing list pgsql-hackers

Hi,

A recent run of CI on master had this failure:
  https://cirrus-ci.com/task/5786871604707328
on master, for openbsd.

regress log:

https://api.cirrus-ci.com/v1/artifact/task/5786871604707328/testrun/build/testrun/subscription/022_twophase_cascade/log/regress_log_022_twophase_cascade
server log:

https://api.cirrus-ci.com/v1/artifact/task/5786871604707328/testrun/build/testrun/subscription/022_twophase_cascade/log/022_twophase_cascade_node_C.log

The relevant excerpt from the log seems to be:

2025-10-06 07:36:47.556 UTC postmaster[14742] LOG:  database system is ready to accept connections
2025-10-06 07:36:47.594 UTC unrecognized[36715] FATAL:  setsid() failed: Operation not permitted
2025-10-06 07:36:47.602 UTC postmaster[14742] LOG:  WAL writer process (PID 36715) exited with exit code 1

Severel interesting bits:
a) why is setsid() failing
b) why did we write "unrecognized" as the backend type?

Greetings,

Andres Freund