Comment 15 for bug 1575106

To reproduce issue you can use:
# for i in `seq 10`; do /etc/init.d/apache2 graceful; done
 * Reloading web server apache2
 *
 * Reloading web server apache2
 *
 * Reloading web server apache2
 *
 * Apache2 is not running
 * Reloading web server apache2
 *
 * Apache2 is not running
 * Reloading web server apache2

After apache is down, in logs you can find:
# tail /var/log/apache2/error.log
[Wed May 11 11:30:55.605894 2016] [core:notice] [pid 2608] AH00060: seg fault or similar nasty error detected in the parent process