[Koha] Plack causes permanent CPU load of 100%

[Michael Kuhn]

Hi

We are running Koha 16.11.01 on Debian GNU/Linux 8 (64-bit).

Since some weeks we see Plack causing an almost permanent CPU load of 
100% (maybe this happened after a regular update of the Debian Perl 
packages?). The file "/var/log/koha/INSTANCE/plack.log" constantly gets 
lines like the following added:

Error while loading /etc/koha/plack.psgi: Can't load application from 
file "/usr/share/koha/api/v1/app.pl": Can't locate object method 
"cache_dir" via package "Swagger2::SchemaValidator" at 
/usr/share/perl5/Swagger2.pm line 41.
Compilation failed in require at (eval 1221) line 1.

A restart of the host doesn't solve the problem. For the moment we have 
stopped Plack and deactivated it completely.

Does anyone know what causes this problem and how to solve it?

Best wishes: Michael
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