My next bet would be SELinux.
Look at this reply. There's the links to similar issues with SELinux.
As always you can use search ;)
Thanks Nikolai for the SELinux discussion link. You've been spoiling us with useful links. That's why sometimes we forget about search functionality ;)
I hope my bet is correct :)
It seems to be the SELinux that restricts the read/write permissions. I set SELinux to the permissive mode for testing and the 'Cache path is not writable' error is gone.
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