What could cause rsync to kill ssh?

I have an rsync script that it is copying one computer (over ssh) to a shared CIFS mount on Gentoo Linux, kernel 6.3.4. The script runs for a while and then at some point quits knocking my ssh session offline on all terminals and it blocks ssh from being able to connect again. Even restarting sshd doesn’t help. Rsync has apparently killed it. I have to reboot.

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