This is actually on 4.4, as it happened during the upgrade.
I have attempted the 4.4.2 in-place upgrade, and it failed.
When I went back to my dashboard, my site is stuck on the "UPDATE IN PROGRESS" screen, and I can't recover from it.
...upon going to /admin/upgrade/ it says 'there are no applications to upgrade' and gives the button "EXIT UPGRADER".
Upon clicking that button, it takes me to the "UPDATE IN PROGRESS" screen (with the option of "TRY AGAIN"), but am unable to recover my site.
Help?!
For what it's worth, I had previously done the same upgrade on another site, and it completed without a hitch. This second attempt failed during the extracting effort.