Stefan Fritsch wrote:
> On Monday, 16 April 2018 20:34:00 CEST Matthew Gabeler-Lee wrote:
> > On Sat, 14 Apr 2018, Stefan Fritsch wrote:
> > > This seems to be a systemd bug. Changing PrivateTmp from true to false in
> > > apache2.service fixes the issue. But even with PrivateTmp it works for
> > > some time. It would be interesting what is the trigger to make it fail
> > > later on.
> > 
> > Hmm ... I was having a problem on some systems where tmpreaper, in its
> > default configuration, will eventually delete all the directories
> > systemd creates to support PrivateTmp, which might explain this...
> That seems a likely explanation. I have tmpreaper installed, too. The default 
> keep time is 7 days, which explains why the issue does not appear immediately.
> So tmpreaper should exclude systemd-private-* files by default. Moritz, do 
> you 
> also have some cron job cleaning up stale files in /tmp ?

Good catch, in fact we do! And it's only enabled for our mediawiki 
which would also explain why we don't run into it with our other Apache 
on stretch:


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