Re: lib/54527: syslogd hangs when forwarding logs to a IPv6 host that is down

[Anthony Mallet <tho%netbsd.org@localhost>]

The following reply was made to PR lib/54527; it has been noted by GNATS.

From: Anthony Mallet <tho%netbsd.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: Christos Zoulas <christos%zoulas.com@localhost>
    lib-bug-people%netbsd.org@localhost,
    gnats-admin%netbsd.org@localhost,
    netbsd-bugs%netbsd.org@localhost
Subject: Re: lib/54527: syslogd hangs when forwarding logs to a IPv6 host that
 is down
Date: Sat, 14 Sep 2019 19:43:29 +0200

 On Saturday 14 Sep 2019, at 09:55, Christos Zoulas wrote:
 > Congratulations, you found a kernel bug. MSG_PEEK is not supposed to
 > reset so->so_ {r,}error.  Try this (not even compile-tested).
 
 Ah, yes, it makes sense now that you say it ...
 Your patch works perfectly, thanks!
 
 Now syslogd logs "warning: can't get client address: Host is down"
 because of the warning in libwrap (src/lib/libwrap/socket.c:109). This
 is not really relevant in this case, since we are not really receiving
 a remote message, just a local sending error (and we will fail to
 recv(2) anyway). But it's a detail, I'm not sure it requires fixing :)
 
 (or maybe just warn if errno != EHOSTDOWN ?)