Suddenly I'm no longer able to resume screens I have running on a remote machine. I've never had this happen in a few years of running this machine. I don't know that it's connected but I did run yum update last night.
I can see the screens listed and they're properly detached:
18709.bungee (Detached)
5462.mc (Detached)
7045.ftb (Detached)
Yet when I try to resume any of them, all I get is the cursor on the next line. Any attempt to exit or detach fails and I have no choice but to close my ssh connection entirely.
I have some services running in those screens that I need to gracefully shutdown before I try rebooting the server itself.
Is there any known cause of this? Or any way for me to get into a screen?
Since 4.2.1
screenuses file sockets instead of named pipes for IPC by default. If you have updated screen from such old version your old sessions will become inaccessible. You have to destroy old sessions or downgradescreento close sessions properly.