[Bug 203129] syslogd: /dev/console: Interrupted system call on arm64

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

pvoigt at uos.de changed:

           What    |Removed                     |Added
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                 CC|                            |pvoigt at uos.de

--- Comment #1 from pvoigt at uos.de ---
I can observe this on 11.0-RELEASE-p8 (amd64) rather regularly as well.

The message occurs nearly every time when cron starts newsyslog every hour
which in turn triggers a restart of syslogd.

After the first occurance of the message there are no more messages written to
/dev/console. Sometimes syslogd even hangs in a state where it is still visible
in the process list but does not do any logging anymore. And a restart even
fails.

I have discussed this issue on IRC and besides other advice I have been told it
is somehow related to the serial console. I have been playing with different
speeds with no effect. But after disabling agetty on ttyu0 the messages are
gone.

At this point I am a bit lost, because need serial console logins with my
headless server. And I cannot decide, if my uart device is somehow broken or if
agetty/syslogd may have an error.

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