[Bug 279365] Incomplete syslog message on console after login timeout

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=279365

            Bug ID: 279365
           Summary: Incomplete syslog message on console after login
                    timeout
           Product: Base System
           Version: 15.0-CURRENT
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: bin
          Assignee: bugs@FreeBSD.org
          Reporter: jfc@mit.edu

When login on the console times out an apparent race between respawning getty
and logging the failure results in an incomplete syslog message on the console.

This is the console:

FreeBSD/arm64 (striatus) (ttyu0)

login: invalid
Password:
Login incorrect
login: Login timed out after 300 seconds
May 28 10:56:38 striatus login[66089]
FreeBSD/arm64 (striatus) (ttyu0)

login: 


The full message is in /var/log/messages:

May 28 10:56:38 striatus login[66089]: 1 LOGIN FAILURE ON ttyu0

Possibly getty is interrupting a non-atomic write by syslog.  I know syslog is
capable of reporting the full message because I see it if I type ^D instead of
waiting for login to give up.

This is my console device:

uart0: <PrimeCell UART (PL011)> mem 0xe1010000-0xe1010fff irq 13 on simplebus0
uart0: console (115200,n,8,1)

Externally it appears as a type B USB socket, device ID 2e02:1000 (SoftIron
OverDrive 1000), version 1.02, full speed.  It is plugged into a Mac.

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