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From <>
Subject [users@httpd] Problems with mod_proxy_balancer / slotmem_create @ apache 2.4.4
Date Mon, 12 Aug 2013 11:19:51 GMT
Hello eveybody,

since apache version 2.4.4 I have a problem by running multiple apache instances on my server.
Normally we run multiple apaches, under different users, on one machine, but since 2.4.4 we
have often the problem that apache is not able to reserve shared memory, because some other
instance is using the same shared memory block.

The failure in the logs:

[Fri Aug 09 09:24:31.160654 2013] [:emerg] [pid 23958:tid 139658191218496] AH00020: Configuration
Failed, exiting

[Fri Aug 09 11:09:46.919038 2013] [proxy_balancer:emerg] [pid 6549:tid 139675464337216] (17)File
exists: AH01179: balancer slotmem_create failed

Also seen from another failure

6989  shmget(0x1038007, 537, IPC_CREAT|IPC_EXCL|0600) = -1 EEXIST (File exists)

If I now check the shared memory with "ipcs -a" I see that the segment is reserverd by another
instance of another user. After waiting a couple of minutes (up to hours) the apache is then
able to start, but waiting is currently not really an option!?

Currently, I'm using apache 2.4.4 with the newest open ssl and and openldap version on Suse
Linux 11 SP1/2.

Is there any work around or solution available, or an idea to solve this issue?


BMW Group
Andre Wendel
Lösungsbau IT, Plattformen
80788 München

Tel: +49-89-382-50385<>
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