[Bug 263489] sshd does not work after reboot to 13.1-RC4

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=263489

--- Comment #3 from rob2g2 <rob2g2-freebsd@bitbert.com> ---
had another instance today, again different hardware. Now with some more
details:

*) my sshd_config only uses ed25519, having the line "HostKey
/etc/ssh/ssh_host_ed25519_key" in my config
*) reconnection after upgrade to RC4 works, after the finishing process of
executing "freebsd-update install" it seems I cannot connect any more. 

*) dmesg:
Apr 26 13:56:16 hpnb2 sshd[32523]: fatal: recv_rexec_state: parse config:
incomplete message
Apr 26 13:56:20 hpnb2 sshd[33082]: fatal: recv_rexec_state: parse config:
incomplete message

*) before rebooting I switched loglevel to DEBUG in sshd_config, and I got:
Apr 26 13:56:16 hpnb2 sshd[37588]: debug1: fd 5 clearing O_NONBLOCK
Apr 26 13:56:16 hpnb2 sshd[37588]: debug1: Forked child 32523.
Apr 26 13:56:16 hpnb2 sshd[32523]: debug1: rexec start in 5 out 5 newsock 5
pipe 7 sock 8

This just happens once, so a restart of the sshd service solves the problem,
however, imho this should be done automatically when running freebsd-update
after the reboot, otherwise I guess quite some users will forget to manually
restart the service and will be locked out if they only have remote access.

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