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Date:      Thu, 12 Apr 2018 21:42:34 +0000
From:      bugzilla-noreply@freebsd.org
To:        bugs@FreeBSD.org
Subject:   [Bug 203129] syslogd: /dev/console: Interrupted system call
Message-ID:  <bug-203129-227-lYBvNhI7Wr@https.bugs.freebsd.org/bugzilla/>
In-Reply-To: <bug-203129-227@https.bugs.freebsd.org/bugzilla/>
References:  <bug-203129-227@https.bugs.freebsd.org/bugzilla/>

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D203129

--- Comment #12 from Adam Bernstein <adam@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 t=
he
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 aw=
are
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 relevan=
t.
FWIW, 'ps' showed the getty process for the serial port with just "-" in it=
s 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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