Hi Hackers,
Inside PostgresNode.pm there is a free port choosing routine ---
get_free_port(). The comment section there says:
# On non-Linux, non-Windows kernels, binding to 127.0.0/24 addresses
# other than 127.0.0.1 might fail with EADDRNOTAVAIL.
And this is an absolute true, on BSD-like systems (macOS and FreeBSD
tested) it hangs on looping through the entire ports range over and over
when $PostgresNode::use_tcp = 1 is set, since bind fails with:
# Checking port 52208
# bind: 127.0.0.1 52208
# bind: 127.0.0.2 52208
bind: Can't assign requested address
To reproduce just apply reproduce.diff and try to run 'make -C
src/bin/pg_ctl check'.
This is not a case with standard Postgres tests, since TestLib.pm
chooses unix sockets automatically everywhere outside Windows. However,
we got into this problem when tried to run a custom tap test that
required TCP for stable running.
That way, if it really could happen why not to just skip binding to
127.0.0/24 addresses other than 127.0.0.1 outside of Linux/Windows as
per attached patch_PostgresNode.diff?
Regards
--
Alexey Kondratov
Postgres Professional https://www.postgrespro.com
Russian Postgres Company