Bug 52841

Summary:	[proxy_balancer:emerg] [pid 25593] AH01177: Failed to lookup provider 'shm' for 'slotmem': is mod_slotmem_shm loaded??
Product:	Apache httpd-2	Reporter:	msubbareddy <m_subbareddy>
Component:	Build	Assignee:	Apache HTTPD Bugs Mailing List <bugs>
Status:	NEEDINFO ---
Severity:	normal	CC:	petr.sumbera
Priority:	P2
Version:	2.4.9
Target Milestone:	---
Hardware:	PC
OS:	All
Attachments:	possible fix

Description msubbareddy 2012-03-06 20:14:43 UTC

As mentioned, to use the version 1297560 in http://www.mail-archive.com/dev@httpd.apache.org/msg54299.html,

Still, issue with proxy_balancer:emerg though recompiled with http://svn.apache.org/viewvc?view=revision&revision=1297560
httpd/httpd/trunk/modules/slotmem/mod_slotmem_shm.c

And, added user to use apache and group nogroup instead of daemon in conf.
but, still same issue.

error_log:
[proxy_balancer:emerg] [pid 25593] AH01177: Failed to lookup provider 'shm' for 'slotmem': is mod_slotmem_shm loaded??
[:emerg] [pid 25593] AH00020: Configuration Failed, exiting


Initially, logged in Bug report:
https://issues.apache.org/bugzilla/show_bug.cgi?id=52402

Linux: Ubuntu 11.10 i386 x32 bit
Apache2: 2.4.1

Comment 1 msubbareddy 2012-03-07 02:04:16 UTC

Got it, this is no issue with proxy enabled option.
Its basically required to enable the corresponding required module!

[proxy_balancer:emerg] [pid 29584] AH01177: Failed to lookup provider 'shm' for 'slotmem': is mod_slotmem_shm loaded??

by uncommenting the below entry, server has ran without any issue by using 2.4.1 without any additional patches.

LoadModule slotmem_shm_module modules/mod_slotmem_shm.so

Comment 2 Petr Sumbera 2014-06-02 12:46:17 UTC

This is still reproducible. Out of box configuration file still needs to uncomment mod_slotmem_shm loading.

Comment 3 Petr Sumbera 2014-06-02 13:10:18 UTC

Created attachment 31683 [details]
possible fix

Comment 4 Gus Heck 2016-05-19 23:09:41 UTC

just hit this in 2.4.20

Comment 5 Jim Jagielski 2016-11-21 20:38:24 UTC

What are your configure options used to build httpd?

Comment 6 Petr Sumbera 2016-11-22 10:05:10 UTC

It seems that I'm no longer able to reproduce the issue with 2.4.23.

When I build Apache now without the patch (see above) httpd.conf contains:

#LoadModule slotmem_shm_module libexec/mod_slotmem_shm.so

and the httpd starts successfully.

Since I was using the patch I don't know in which version the problem disappeared.