apache 2.4 - Apache2 after graceful restart needs 100% cpu

OS: Debian 8.2, Apache: Apache/2.4.10 (Debian)

Since two days my apache2 "suddenly" starts to run on 100% cpu at night. The process does not stop then and I have run kill -9 to stop it in the morning. service apache2 stop does not work to stop the instance.

I guess it all started when I installed kolab (kolab.org) on my machine. I also installed owncloud before and did some smaller installs. Otherwise the Debian install is pretty much "fresh". But it started the night after installing kolab.

The problem seems to be triggered by a graceful restart at 6 in the morning. At least the logs hint into this direction.

And if I do manually: apachectl -k graceful I get exactly this apache2 process running on 100% cpu.

service apache2 restart does NOT trigger this problem!

I have no clue how to proceed further to find the problem.

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