This is probably a niche topic but perhaps someone has run into this strangeness. On real (not virtualized) hardware, I have two identical instances of Slackware64-current at my disposal.
The primary system is good old ext4 and my playpen system is ZFS-0.6.2. I don't spend much time in the latter experimental system but tonight I encountered something odd. As a regular user, I executed this command:
sudo ls /root
Here's the result:
sudo: unable to stat /etc/sudoers: Permission denied
sudo: no valid sudoers sources found, quitting
sudo: unable to initialize policy plugin
And running strace, more detail emerges:
sudo: effective uid is not 0, is /usr/bin/sudo on a file system with the 'nosuid' option set or an NFS file system without root privileges?
Yet these things show no indication of suid being disabled:
zducky/slack on / type zfs (rw,relatime,xattr)
zducky/slack setuid on default
I think a handful of forum participants are using ZFS on Linux and any troubleshooting tips would be appreciated.