I did some more investigation, and did not find an explanation, but I am
writing it here to maybe save somebody else some effort.
Postfix uses normal(?) `getservbyname(service, protocol)` in the file
src/smtp/smtp_connect.c line 363:
if ((sp = getservbyname(service, protocol)) == 0)
msg_fatal("unknown service: %s/%s", service, protocol);
and I see this message in the log.
On the other hand, a simple program that performs
`chroot("/var/spool/postfix")` and calls `getservbyname()` _works
correctly_ on hirsute (C code in attachment):
crosser@pccross:~/src$ sudo ./getsrvname
[sudo] password for crosser:
s_name="smtp", s_port=25, s_proto="tcp"
Note though that in such form the the program does not try to use NSS,
it just opens `/etc/services` directly. While postfix's `smtp` goes
through nsswitch, as can be seen in the strace log from my previous
attachment.
** Attachment added: "getsrvname.c"
https://bugs.launchpad.net/ubuntu/+source/postfix/+bug/1916541/+attachment/5466343/+files/getsrvname.c
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https://bugs.launchpad.net/bugs/1916541
Title:
smtp "fatal: unknown service: smtp/tcp", probably after libc upgrade
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