I just started having issues using tmux/screen, being unable to create new virtual windows. I kept getting permission denied, though trying to run tmux/screen as root would work perfectly.
The strange thing is, the RBAC system was disabled when this started happening, but had been enabled for much of the day while I'd been testing.
As best I can see, something changed the permissions on /dev/ptmux so that only root was allowed to write to it.
Before I rebooted:
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crw------- 1 root root 5, 2 Oct 20 22:42 ptmx
After a reboot (when it started working fine again)
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crw-rw-rw- 1 root root 5, 2 Oct 21 06:11 ptmx
Could this be anything to do with the new inode tracking?
It could also just be a bug in vanilla I guess.