[Bug 203129] syslogd: /dev/console: Interrupted system call

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=203129

--- Comment #12 from Adam Bernstein <adam at electricembers.coop> ---
Sorry for my untidy commenting, but two additions to make:

1. The workaround of removing any /dev/console logging from syslog.conf did do
the trick for us, it's just not really an ideal or complete fix.

2. It took us a long time to identify syslogd as the root cause among all the
symptoms and to notice the right error message (the interrupted system call)
that led us to this bug. Instead, the only visible error message we were aware
of for a while was this one, repeated every 30 seconds in the messages log
whenever we attempted to connect to the serial console:

  init: getty repeating too quickly on port /dev/ttyu0, sleeping 30 secs

But a web search on that error turned up a lot of stuff, none of it relevant.
FWIW, 'ps' showed the getty process for the serial port with just "-" in its TT
column instead of "u0", and lacking the "s+" in its STAT column that the
healthy gettys had.

I hope that will help someone else find this bug quicker.

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