bin/52701: rtadvd logs thousands of syslog messages

[gson%gson.org@localhost (Andreas Gustafsson)]

>Number:         52701
>Category:       bin
>Synopsis:       rtadvd logs thousands of syslog messages
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    bin-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Sun Nov 05 13:35:00 +0000 2017
>Originator:     Andreas Gustafsson
>Release:        NetBSD-current, source date >= 2017.02.28.04.47.41
>Organization:

>Environment:
System: NetBSD
Architecture: i386
Machine: i386
>Description:

While reviewing console output logs from the test runs on the TNF
testbed in the course of investigating an unrelated bug, I noticed
that some of the logs included messages like the following:

  Nov  2 18:40:30	 syslogd[189]: last message repeated 78108 times
  Nov  2 18:50:30	 syslogd[189]: last message repeated 116025 times
  Nov  2 19:00:30	 syslogd[189]: last message repeated 112322 times
  Nov  2 19:10:30	 syslogd[189]: last message repeated 111487 times
  Nov  2 19:20:31	 syslogd[189]: last message repeated 119638 times
  Nov  2 19:30:31	 syslogd[189]: last message repeated 113491 times
  Nov  2 19:40:31	 syslogd[189]: last message repeated 112569 times
  Nov  2 19:50:31	 syslogd[189]: last message repeated 112543 times
  Nov  2 20:00:33	 syslogd[189]: last message repeated 133812 times
  Nov  2 20:10:33	 syslogd[189]: last message repeated 137892 times
  Nov  2 20:20:33	 syslogd[189]: last message repeated 144270 times
  Nov  2 20:30:34	 syslogd[189]: last message repeated 140495 times
  Nov  2 20:40:34	 syslogd[189]: last message repeated 135550 times
  Nov  2 20:50:34	 syslogd[189]: last message repeated 139106 times
  Nov  2 21:00:34	 syslogd[189]: last message repeated 139265 times

These particular ones are are from

  http://releng.netbsd.org/b5reports/i386/build/2017.11.01.21.13.26/test.log

As far as I can tell from the log, the message being repeated is:

  Nov  2 11:09:07  rtadvd[1478]: main: poll: Socket is not connected

The messages first appeared in February, in

  http://releng.netbsd.org/b5reports/i386/build/2017.02.28.04.47.41/test.log

but since they do not appear in every test run, this does not identify
the exact commit that triggered the problem.

>How-To-Repeat:

>Fix: