Bummer. This last "echo x > /tmp/x" issue is probably the result of
protected_regular being set in kernel configs, see
https://docs.kernel.org/admin-guide/sysctl/fs.html#id12
Sorry about the noise. (Hangs head in shame.)
Cheers, Paul
Another oddity that should never happen: root cannot write file
that he does not own. Demonstration (root running bash):
root# touch /tmp/x
root# ls -l /tmp/x
-rw-r--r-- 1 root root 0 Aug 10 09:39 /tmp/x
root# echo a > /tmp/x
root# chown 2:2 /tmp/x
root# ls -l /tmp/x
-rw-r--r-- 1 bin
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