title: mod_slotmem_shm is causing error in apache2.4.29 loading
body: <p>I am in process of upgrading from apache 2.2 to 2.4.29, while everything is working fine without ssl and ssl. But when I try to use proxy modules along with slotmem_shm modules, which is according to my understanding is mandatory now while using load balancers modules, I am getting following errors in error_log :</p>
  
  <pre><code>[Fri Mar 16 17:52:12.073931 2018] [lbmethod_heartbeat:notice] [pid 15571:tid 1] AH02282: No slotmem from mod_heartmonitor
  [Fri Mar 16 17:52:12.275257 2018] [slotmem_shm:error] [pid 15571:tid 1] (17)File exists: AH02611: create: apr_shm_create(/usr/local/apache_QA_New/logs/slotmem-shm-p9cbf72c_check.shm) failed
  [Fri Mar 16 17:52:12.275543 2018] [proxy_balancer:emerg] [pid 15571:tid 1] (17)File exists: AH01185: worker slotmem_create failed
  [Fri Mar 16 17:52:12.275721 2018] [:emerg] [pid 15571:tid 1] AH00020: Configuration Failed, exiting
  </code></pre>
  
  <p>I have been brainstorming for last 2 weeks. I have tried different solutions  like increasing kernel semaphores memory, they were about 128K which I have increased to 16384K, but this solution still does not seem to work and it does not seem to be proper solution either.</p>
  
  <p>There are almost 30 balancers entries in my balancer file and more than 50 virtual hosts entries in httpd-vhosts.conf and at each restart apache creates some file for shm and then go down and it keeps doing so until creation of all files for which I have to restart it again and again.</p>