Bug#909750: applications tries to write to /usr/* directories via libfontconfig1

[Jakub Wilk]

* Laurent Bigonville <bigon at debian.org>, 2018-11-11, 11:18:
>Do you have any .uuid files in these directories?

IIRC, I didn't have any back then.

>Can you try to run "fc-cache -s -f -v" (as root) and see if it helps.

I think I upgraded some font package, which triggered fontconfig, which 
ran the aforementioned command. Yes, it did help.

>What file system do you use for /usr/share/fonts/?

ext4

>The only occurrence I'm seeing on my system is:
>
>openat(AT_FDCWD, "/usr/lib/firefox/fonts/.uuid.TMP-EWjEq0", O_RDWR|O_CREAT|O_EXCL|O_CLOEXEC, 0600) = -1 EACCES (Permission denied)

Now it's the only occurrence for me, too.

-- 
Jakub Wilk