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OpenSSH: race condition in sshd allows remote code execution
(stackdiary.com)
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Did the same with raspi3... It broke too many things for me and couldn't be restarted. I then completely reinstalled it.
Aww that sucks. To be fair I did take a full image backup before attempting the upgrade in case something went awry.
I also had a complete backup, but I was also considering reinstalling it at the time anyway. Accordingly, only partially restored data. But you should definitely make a backup, that's true.